drop table if exists t1,t2,t3,t4,t5,t6; set @sav_dpi= @@div_precision_increment; set div_precision_increment= 5; show variables like 'div_precision_increment'; Variable_name Value div_precision_increment 5 create table t1 (grp int, a bigint unsigned, c char(10) not null); insert into t1 values (1,1,"a"); insert into t1 values (2,2,"b"); insert into t1 values (2,3,"c"); insert into t1 values (3,4,"E"); insert into t1 values (3,5,"C"); insert into t1 values (3,6,"D"); select a,c,sum(a) from t1 group by a; a c sum(a) 1 a 1 2 b 2 3 c 3 4 E 4 5 C 5 6 D 6 select a,c,sum(a) from t1 where a > 10 group by a; a c sum(a) select sum(a) from t1 where a > 10; sum(a) NULL select a from t1 order by rand(10); a 2 6 1 3 5 4 select distinct a from t1 order by rand(10); a 2 6 1 3 5 4 select count(distinct a),count(distinct grp) from t1; count(distinct a) count(distinct grp) 6 3 insert into t1 values (null,null,''); select count(distinct a),count(distinct grp) from t1; count(distinct a) count(distinct grp) 6 3 select sum(all a),count(all a),avg(all a),std(all a),variance(all a),bit_or(all a),bit_and(all a),min(all a),max(all a),min(all c),max(all c) from t1; sum(all a) count(all a) avg(all a) std(all a) variance(all a) bit_or(all a) bit_and(all a) min(all a) max(all a) min(all c) max(all c) 21 6 3.50000 1.70783 2.91667 7 0 1 6 E select grp, sum(a),count(a),avg(a),std(a),variance(a),bit_or(a),bit_and(a),min(a),max(a),min(c),max(c) from t1 group by grp; grp sum(a) count(a) avg(a) std(a) variance(a) bit_or(a) bit_and(a) min(a) max(a) min(c) max(c) NULL NULL 0 NULL NULL NULL 0 18446744073709551615 NULL NULL 1 1 1 1.00000 0.00000 0.00000 1 1 1 1 a a 2 5 2 2.50000 0.50000 0.25000 3 2 2 3 b c 3 15 3 5.00000 0.81650 0.66667 7 4 4 6 C E select grp, sum(a)+count(a)+avg(a)+std(a)+variance(a)+bit_or(a)+bit_and(a)+min(a)+max(a)+min(c)+max(c) as sum from t1 group by grp; grp sum NULL NULL 1 7 2 20.25 3 45.48316324759439 create table t2 (grp int, a bigint unsigned, c char(10)); insert into t2 select grp,max(a)+max(grp),max(c) from t1 group by grp; replace into t2 select grp, a, c from t1 limit 2,1; select * from t2; grp a c NULL NULL 1 2 a 2 5 c 3 9 E 2 3 c drop table t1,t2; CREATE TABLE t1 (id int(11),value1 float(10,2)); INSERT INTO t1 VALUES (1,0.00),(1,1.00), (1,2.00), (2,10.00), (2,11.00), (2,12.00); CREATE TABLE t2 (id int(11),name char(20)); INSERT INTO t2 VALUES (1,'Set One'),(2,'Set Two'); select id, avg(value1), std(value1), variance(value1) from t1 group by id; id avg(value1) std(value1) variance(value1) 1 1.0000000 0.816497 0.666667 2 11.0000000 0.816497 0.666667 select name, avg(value1), std(value1), variance(value1) from t1, t2 where t1.id = t2.id group by t1.id; name avg(value1) std(value1) variance(value1) Set One 1.0000000 0.816497 0.666667 Set Two 11.0000000 0.816497 0.666667 drop table t1,t2; create table t1 (id int not null); create table t2 (id int not null,rating int null); insert into t1 values(1),(2),(3); insert into t2 values(1, 3),(2, NULL),(2, NULL),(3, 2),(3, NULL); select t1.id, avg(rating) from t1 left join t2 on ( t1.id = t2.id ) group by t1.id; id avg(rating) 1 3.00000 2 NULL 3 2.00000 select sql_small_result t2.id, avg(rating) from t2 group by t2.id; id avg(rating) 1 3.00000 2 NULL 3 2.00000 select sql_big_result t2.id, avg(rating) from t2 group by t2.id; id avg(rating) 1 3.00000 2 NULL 3 2.00000 select sql_small_result t2.id, avg(rating+0.0e0) from t2 group by t2.id; id avg(rating+0.0e0) 1 3 2 NULL 3 2 select sql_big_result t2.id, avg(rating+0.0e0) from t2 group by t2.id; id avg(rating+0.0e0) 1 3 2 NULL 3 2 drop table t1,t2; create table t1 (a smallint(6) primary key, c char(10), b text); INSERT INTO t1 VALUES (1,'1','1'); INSERT INTO t1 VALUES (2,'2','2'); INSERT INTO t1 VALUES (4,'4','4'); select count(*) from t1; count(*) 3 select count(*) from t1 where a = 1; count(*) 1 select count(*) from t1 where a = 100; count(*) 0 select count(*) from t1 where a >= 10; count(*) 0 select count(a) from t1 where a = 1; count(a) 1 select count(a) from t1 where a = 100; count(a) 0 select count(a) from t1 where a >= 10; count(a) 0 select count(b) from t1 where b >= 2; count(b) 2 select count(b) from t1 where b >= 10; count(b) 0 select count(c) from t1 where c = 10; count(c) 0 drop table t1; CREATE TABLE t1 (d DATETIME, i INT); INSERT INTO t1 VALUES (NOW(), 1); SELECT COUNT(i), i, COUNT(i)*i FROM t1 GROUP BY i; COUNT(i) i COUNT(i)*i 1 1 1 SELECT COUNT(i), (i+0), COUNT(i)*(i+0) FROM t1 GROUP BY i; COUNT(i) (i+0) COUNT(i)*(i+0) 1 1 1 DROP TABLE t1; create table t1 ( num float(5,2), user char(20) ); insert into t1 values (10.3,'nem'),(20.53,'monty'),(30.23,'sinisa'); insert into t1 values (30.13,'nem'),(20.98,'monty'),(10.45,'sinisa'); insert into t1 values (5.2,'nem'),(8.64,'monty'),(11.12,'sinisa'); select sum(num) from t1; sum(num) 147.58 select sum(num) from t1 group by user; sum(num) 50.15 45.63 51.80 drop table t1; create table t1 (a1 int, a2 char(3), key k1(a1), key k2(a2)); insert into t1 values(10,'aaa'), (10,null), (10,'bbb'), (20,'zzz'); create table t2(a1 char(3), a2 int, a3 real, key k1(a1), key k2(a2, a1)); select * from t1; a1 a2 10 aaa 10 NULL 10 bbb 20 zzz select min(a2) from t1; min(a2) aaa select max(t1.a1), max(t2.a2) from t1, t2; max(t1.a1) max(t2.a2) NULL NULL select max(t1.a1) from t1, t2; max(t1.a1) NULL select max(t2.a2), max(t1.a1) from t1, t2; max(t2.a2) max(t1.a1) NULL NULL explain select min(a2) from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away explain select max(t1.a1), max(t2.a2) from t1, t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row insert into t2 values('AAA', 10, 0.5); insert into t2 values('BBB', 20, 1.0); select t1.a1, t1.a2, t2.a1, t2.a2 from t1,t2; a1 a2 a1 a2 10 aaa AAA 10 10 aaa BBB 20 10 NULL AAA 10 10 NULL BBB 20 10 bbb AAA 10 10 bbb BBB 20 20 zzz AAA 10 20 zzz BBB 20 SET @save_optimizer_switch=@@optimizer_switch; SET optimizer_switch='outer_join_with_cache=off'; select max(t1.a1), max(t2.a1) from t1, t2 where t2.a2=9; max(t1.a1) max(t2.a1) NULL NULL select max(t2.a1), max(t1.a1) from t1, t2 where t2.a2=9; max(t2.a1) max(t1.a1) NULL NULL select t1.a1, t1.a2, t2.a1, t2.a2 from t1 left outer join t2 on t1.a1=10; a1 a2 a1 a2 10 aaa AAA 10 10 aaa BBB 20 10 NULL AAA 10 10 NULL BBB 20 10 bbb AAA 10 10 bbb BBB 20 20 zzz NULL NULL select max(t1.a2) from t1 left outer join t2 on t1.a1=10; max(t1.a2) zzz select max(t2.a1) from t2 left outer join t1 on t2.a2=10 where t2.a2=20; max(t2.a1) BBB select max(t2.a1) from t2 left outer join t1 on t2.a2=10 where t2.a2=10; max(t2.a1) AAA select max(t2.a1) from t1 left outer join t2 on t1.a2=t2.a1 and 1=0 where t2.a1='AAA'; max(t2.a1) NULL select max(t1.a2),max(t2.a1) from t1 left outer join t2 on t1.a1=10; max(t1.a2) max(t2.a1) zzz BBB SET optimizer_switch=@save_optimizer_switch; drop table t1,t2; CREATE TABLE t1 (a int, b int); select count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1; count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b) 0 NULL NULL NULL NULL NULL 18446744073709551615 0 select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a; a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b) insert into t1 values (1,null); select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a; a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b) 1 0 NULL NULL NULL NULL NULL 18446744073709551615 0 insert into t1 values (1,null); insert into t1 values (2,null); select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a; a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b) 1 0 NULL NULL NULL NULL NULL 18446744073709551615 0 2 0 NULL NULL NULL NULL NULL 18446744073709551615 0 select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a; a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b) 1 0 NULL NULL NULL NULL NULL 18446744073709551615 0 2 0 NULL NULL NULL NULL NULL 18446744073709551615 0 insert into t1 values (2,1); select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a; a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b) 1 0 NULL NULL NULL NULL NULL 18446744073709551615 0 2 1 1 1.00000 0.00000 1 1 1 1 select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a; a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b) 1 0 NULL NULL NULL NULL NULL 18446744073709551615 0 2 1 1 1.00000 0.00000 1 1 1 1 insert into t1 values (3,1); select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a; a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b) 1 0 NULL NULL NULL NULL NULL 18446744073709551615 0 2 1 1 1.00000 0.00000 1 1 1 1 3 1 1 1.00000 0.00000 1 1 1 1 select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b), bit_xor(b) from t1 group by a; a count(b) sum(b) avg(b) std(b) min(b) max(b) bit_and(b) bit_or(b) bit_xor(b) 1 0 NULL NULL NULL NULL NULL 18446744073709551615 0 0 2 1 1 1.00000 0.00000 1 1 1 1 1 3 1 1 1.00000 0.00000 1 1 1 1 1 explain extended select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b), bit_xor(b) from t1 group by a; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 5 100.00 Using filesort Warnings: Note 1003 select sql_big_result test.t1.a AS a,count(test.t1.b) AS count(b),sum(test.t1.b) AS sum(b),avg(test.t1.b) AS avg(b),std(test.t1.b) AS std(b),min(test.t1.b) AS min(b),max(test.t1.b) AS max(b),bit_and(test.t1.b) AS bit_and(b),bit_or(test.t1.b) AS bit_or(b),bit_xor(test.t1.b) AS bit_xor(b) from test.t1 group by test.t1.a drop table t1; create table t1 (col int); insert into t1 values (-1), (-2), (-3); select bit_and(col), bit_or(col) from t1; bit_and(col) bit_or(col) 18446744073709551612 18446744073709551615 select SQL_BIG_RESULT bit_and(col), bit_or(col) from t1 group by col; bit_and(col) bit_or(col) 18446744073709551613 18446744073709551613 18446744073709551614 18446744073709551614 18446744073709551615 18446744073709551615 drop table t1; create table t1 (a int); select avg(2) from t1; avg(2) NULL drop table t1; create table t1( a1 char(3) primary key, a2 smallint, a3 char(3), a4 real, a5 date, key k1(a2,a3), key k2(a4 desc,a1), key k3(a5,a1) ); create table t2( a1 char(3) primary key, a2 char(17), a3 char(2), a4 char(3), key k1(a3, a2), key k2(a4) ); insert into t1 values('AME',0,'SEA',0.100,date'1942-02-19'); insert into t1 values('HBR',1,'SEA',0.085,date'1948-03-05'); insert into t1 values('BOT',2,'SEA',0.085,date'1951-11-29'); insert into t1 values('BMC',3,'SEA',0.085,date'1958-09-08'); insert into t1 values('TWU',0,'LAX',0.080,date'1969-10-05'); insert into t1 values('BDL',0,'DEN',0.080,date'1960-11-27'); insert into t1 values('DTX',1,'NYC',0.080,date'1961-05-04'); insert into t1 values('PLS',1,'WDC',0.075,date'1949-01-02'); insert into t1 values('ZAJ',2,'CHI',0.075,date'1960-06-15'); insert into t1 values('VVV',2,'MIN',0.075,date'1959-06-28'); insert into t1 values('GTM',3,'DAL',0.070,date'1977-09-23'); insert into t1 values('SSJ',null,'CHI',null,date'1974-03-19'); insert into t1 values('KKK',3,'ATL',null,null); insert into t1 values('XXX',null,'MIN',null,null); insert into t1 values('WWW',1,'LED',null,null); insert into t2 values('TKF','Seattle','WA','AME'); insert into t2 values('LCC','Los Angeles','CA','TWU'); insert into t2 values('DEN','Denver','CO','BDL'); insert into t2 values('SDC','San Diego','CA','TWU'); insert into t2 values('NOL','New Orleans','LA','GTM'); insert into t2 values('LAK','Los Angeles','CA','TWU'); insert into t2 values('AAA','AAA','AA','AME'); select * from t1; a1 a2 a3 a4 a5 AME 0 SEA 0.1 1942-02-19 HBR 1 SEA 0.085 1948-03-05 BOT 2 SEA 0.085 1951-11-29 BMC 3 SEA 0.085 1958-09-08 TWU 0 LAX 0.08 1969-10-05 BDL 0 DEN 0.08 1960-11-27 DTX 1 NYC 0.08 1961-05-04 PLS 1 WDC 0.075 1949-01-02 ZAJ 2 CHI 0.075 1960-06-15 VVV 2 MIN 0.075 1959-06-28 GTM 3 DAL 0.07 1977-09-23 SSJ NULL CHI NULL 1974-03-19 KKK 3 ATL NULL NULL XXX NULL MIN NULL NULL WWW 1 LED NULL NULL select * from t2; a1 a2 a3 a4 TKF Seattle WA AME LCC Los Angeles CA TWU DEN Denver CO BDL SDC San Diego CA TWU NOL New Orleans LA GTM LAK Los Angeles CA TWU AAA AAA AA AME explain select min(a1) from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a1) from t1; min(a1) AME explain select max(a4) from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select max(a4) from t1; max(a4) 0.1 explain select min(a5), max(a5) from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a5), max(a5) from t1; min(a5) max(a5) 1942-02-19 1977-09-23 explain select min(a3) from t1 where a2 = 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a3) from t1 where a2 = 2; min(a3) CHI explain select min(a1), max(a1) from t1 where a4 = 0.080; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a1), max(a1) from t1 where a4 = 0.080; min(a1) max(a1) BDL TWU explain select min(t1.a5), max(t2.a3) from t1, t2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(t1.a5), max(t2.a3) from t1, t2; min(t1.a5) max(t2.a3) 1942-02-19 WA explain select min(t1.a3), max(t2.a2) from t1, t2 where t1.a2 = 0 and t2.a3 = 'CA'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(t1.a3), max(t2.a2) from t1, t2 where t1.a2 = 0 and t2.a3 = 'CA'; min(t1.a3) max(t2.a2) DEN San Diego explain select min(a1) from t1 where a1 > 'KKK'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a1) from t1 where a1 > 'KKK'; min(a1) PLS explain select min(a1) from t1 where a1 >= 'KKK'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a1) from t1 where a1 >= 'KKK'; min(a1) KKK explain select max(a3) from t1 where a2 = 2 and a3 < 'SEA'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select max(a3) from t1 where a2 = 2 and a3 < 'SEA'; max(a3) MIN explain select max(a5) from t1 where a5 < date'1970-01-01'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select max(a5) from t1 where a5 < date'1970-01-01'; max(a5) 1969-10-05 explain select max(a3) from t1 where a2 is null; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select max(a3) from t1 where a2 is null; max(a3) MIN explain select max(a3) from t1 where a2 = 0 and a3 between 'K' and 'Q'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select max(a3) from t1 where a2 = 0 and a3 between 'K' and 'Q'; max(a3) LAX explain select min(a1), max(a1) from t1 where a1 between 'A' and 'P'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a1), max(a1) from t1 where a1 between 'A' and 'P'; min(a1) max(a1) AME KKK explain select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN'; max(a3) MIN explain select max(a3) from t1 where a3 = 'MIN' and a2 = 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select max(a3) from t1 where a3 = 'MIN' and a2 = 2; max(a3) MIN explain select max(a3) from t1 where a3 = 'DEN' and a2 = 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row select max(a3) from t1 where a3 = 'DEN' and a2 = 2; max(a3) NULL explain select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 = 'CA'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 = 'CA'; max(t1.a3) min(t2.a2) CHI Los Angeles explain select max(a3) from t1 where a2 is null and a2 = 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE select max(a3) from t1 where a2 is null and a2 = 2; max(a3) NULL explain select max(a2) from t1 where a2 >= 1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select max(a2) from t1 where a2 >= 1; max(a2) 3 explain select min(a3) from t1 where a2 = 2 and a3 < 'SEA'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a3) from t1 where a2 = 2 and a3 < 'SEA'; min(a3) CHI explain select min(a3) from t1 where a2 = 4; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row select min(a3) from t1 where a2 = 4; min(a3) NULL explain select min(a3) from t1 where a2 = 2 and a3 > 'SEA'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row select min(a3) from t1 where a2 = 2 and a3 > 'SEA'; min(a3) NULL explain select (min(a4)+max(a4))/2 from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select (min(a4)+max(a4))/2 from t1; (min(a4)+max(a4))/2 0.085 explain select min(a3) from t1 where 2 = a2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a3) from t1 where 2 = a2; min(a3) CHI explain select max(a3) from t1 where a2 = 2 and 'SEA' > a3; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select max(a3) from t1 where a2 = 2 and 'SEA' > a3; max(a3) MIN explain select max(a3) from t1 where a2 = 2 and 'SEA' < a3; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row select max(a3) from t1 where a2 = 2 and 'SEA' < a3; max(a3) NULL explain select min(a3) from t1 where a2 = 2 and a3 >= 'CHI'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a3) from t1 where a2 = 2 and a3 >= 'CHI'; min(a3) CHI explain select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 < 'SEA'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 < 'SEA'; min(a3) CHI explain select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 = 'MIN'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 = 'MIN'; min(a3) MIN explain select min(a3) from t1 where a2 = 2 and a3 >= 'SEA' and a3 = 'MIN'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE select min(a3) from t1 where a2 = 2 and a3 >= 'SEA' and a3 = 'MIN'; min(a3) NULL explain select min(t1.a1), min(t2.a4) from t1,t2 where t1.a1 < 'KKK' and t2.a4 < 'KKK'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away select min(t1.a1), min(t2.a4) from t1,t2 where t1.a1 < 'KKK' and t2.a4 < 'KKK'; min(t1.a1) min(t2.a4) AME AME explain select min(a1) from t1 where a1 > 'KKK' or a1 < 'XXX'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index PRIMARY PRIMARY 3 NULL 15 Using where; Using index explain select min(a1) from t1 where a1 != 'KKK'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index PRIMARY PRIMARY 3 NULL 15 Using where; Using index explain select max(a3) from t1 where a2 < 2 and a3 < 'SEA'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range k1 k1 3 NULL 6 Using where; Using index explain select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 > 'CA'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range k1 k1 7 NULL 1 Using where; Using index 1 SIMPLE t2 range k1 k1 3 NULL 4 Using where; Using index; Using join buffer (flat, BNL join) explain select min(a4 - 0.01) from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL k2 12 NULL 15 Using index explain select max(a4 + 0.01) from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL k2 12 NULL 15 Using index explain select min(a3) from t1 where (a2 +1 ) is null; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL k1 7 NULL 15 Using where; Using index explain select min(a3) from t1 where (a2 + 1) = 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL k1 7 NULL 15 Using where; Using index explain select min(a3) from t1 where 2 = (a2 + 1); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL k1 7 NULL 15 Using where; Using index explain select min(a2) from t1 where a2 < 2 * a2 - 8; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL k1 7 NULL 15 Using where; Using index explain select min(a1) from t1 where a1 between a3 and 'KKK'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 15 Using where explain select min(a4) from t1 where (a4 + 0.01) between 0.07 and 0.08; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL k2 12 NULL 15 Using where; Using index explain select concat(min(t1.a1),min(t2.a4)) from t1, t2 where t2.a4 <> 'AME'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range k2 k2 4 NULL 6 Using where; Using index 1 SIMPLE t1 index NULL PRIMARY 3 NULL 15 Using index; Using join buffer (flat, BNL join) drop table t1, t2; create table t1 (a char(10)); insert into t1 values ('a'),('b'),('c'); select coercibility(max(a)) from t1; coercibility(max(a)) 2 drop table t1; create table t1 (a char character set latin2); insert into t1 values ('a'),('b'); select charset(max(a)), coercibility(max(a)), charset(min(a)), coercibility(min(a)) from t1; charset(max(a)) coercibility(max(a)) charset(min(a)) coercibility(min(a)) latin2 2 latin2 2 show create table t1; Table Create Table t1 CREATE TABLE t1 ( a char(1) CHARACTER SET latin2 DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 create table t2 select max(a),min(a) from t1; show create table t2; Table Create Table t2 CREATE TABLE t2 ( max(a) char(1) CHARACTER SET latin2 DEFAULT NULL, min(a) char(1) CHARACTER SET latin2 DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t2; create table t2 select concat(a) from t1; show create table t2; Table Create Table t2 CREATE TABLE t2 ( concat(a) varchar(1) CHARACTER SET latin2 DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t2,t1; create table t1 (a int); insert into t1 values (1); select max(a) as b from t1 having b=1; b 1 select a from t1 having a=1; a 1 drop table t1; create table t1 (a int); select variance(2) from t1; variance(2) NULL select stddev(2) from t1; stddev(2) NULL drop table t1; create table t1 (a int); insert into t1 values (1),(2); prepare stmt1 from 'SELECT COUNT(*) FROM t1'; execute stmt1; COUNT(*) 2 execute stmt1; COUNT(*) 2 execute stmt1; COUNT(*) 2 deallocate prepare stmt1; drop table t1; create table t1 (a int, primary key(a)); insert into t1 values (1),(2); prepare stmt1 from 'SELECT max(a) FROM t1'; execute stmt1; max(a) 2 execute stmt1; max(a) 2 execute stmt1; max(a) 2 deallocate prepare stmt1; drop table t1; CREATE TABLE t1 (a int primary key); INSERT INTO t1 VALUES (1),(2),(3),(4); SELECT MAX(a) FROM t1 WHERE a > 5; MAX(a) NULL SELECT MIN(a) FROM t1 WHERE a < 0; MIN(a) NULL DROP TABLE t1; CREATE TABLE t1 ( id int(10) unsigned NOT NULL auto_increment, val enum('one','two','three') NOT NULL default 'one', PRIMARY KEY (id) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; INSERT INTO t1 VALUES (1,'one'),(2,'two'),(3,'three'),(4,'one'),(5,'two'); select val, count(*) from t1 group by val; val count(*) one 2 two 2 three 1 drop table t1; CREATE TABLE t1 ( id int(10) unsigned NOT NULL auto_increment, val set('one','two','three') NOT NULL default 'one', PRIMARY KEY (id) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; INSERT INTO t1 VALUES (1,'one'),(2,'two'),(3,'three'),(4,'one'),(5,'two'); select val, count(*) from t1 group by val; val count(*) one 2 two 2 three 1 drop table t1; create table t1(a int, b datetime); insert into t1 values (1, NOW()), (2, NOW()); create table t2 select MAX(b) from t1 group by a; show create table t2; Table Create Table t2 CREATE TABLE t2 ( MAX(b) datetime DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1, t2; create table t1(f1 datetime); insert into t1 values (now()); create table t2 select f2 from (select max(now()) f2 from t1) a; show columns from t2; Field Type Null Key Default Extra f2 datetime YES NULL drop table t2; create table t2 select f2 from (select now() f2 from t1) a; show columns from t2; Field Type Null Key Default Extra f2 datetime NO 0000-00-00 00:00:00 drop table t2, t1; CREATE TABLE t1( id int PRIMARY KEY, a int, b int, INDEX i_b_id(a,b,id), INDEX i_id(a,id) ); INSERT INTO t1 VALUES (1,1,4), (2,2,1), (3,1,3), (4,2,1), (5,1,1); SELECT MAX(id) FROM t1 WHERE id < 3 AND a=2 AND b=6; MAX(id) NULL DROP TABLE t1; CREATE TABLE t1( id int PRIMARY KEY, a int, b int, INDEX i_id(a,id), INDEX i_b_id(a,b,id) ); INSERT INTO t1 VALUES (1,1,4), (2,2,1), (3,1,3), (4,2,1), (5,1,1); SELECT MAX(id) FROM t1 WHERE id < 3 AND a=2 AND b=6; MAX(id) NULL DROP TABLE t1; CREATE TABLE t1 (id int PRIMARY KEY, b char(3), INDEX(b)); INSERT INTO t1 VALUES (1,'xx'), (2,'aa'); SELECT * FROM t1; id b 1 xx 2 aa SELECT MAX(b) FROM t1 WHERE b < 'ppppp'; MAX(b) aa SHOW WARNINGS; Level Code Message SELECT MAX(b) FROM t1 WHERE b < 'pp'; MAX(b) aa DROP TABLE t1; CREATE TABLE t1 (id int PRIMARY KEY, b char(16), INDEX(b(4))); INSERT INTO t1 VALUES (1, 'xxxxbbbb'), (2, 'xxxxaaaa'); SELECT MAX(b) FROM t1; MAX(b) xxxxbbbb EXPLAIN SELECT MAX(b) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 DROP TABLE t1; CREATE TABLE t1 (id int , b varchar(512), INDEX(b(250))) COLLATE latin1_bin; INSERT INTO t1 VALUES (1,CONCAT(REPEAT('_', 250), "qq")), (1,CONCAT(REPEAT('_', 250), "zz")), (1,CONCAT(REPEAT('_', 250), "aa")), (1,CONCAT(REPEAT('_', 250), "ff")); SELECT MAX(b) FROM t1; MAX(b) __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________zz EXPLAIN SELECT MAX(b) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 4 DROP TABLE t1; CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1,1),(1,2),(2,3); SELECT (SELECT COUNT(DISTINCT t1.b)) FROM t1 GROUP BY t1.a; (SELECT COUNT(DISTINCT t1.b)) 2 1 SELECT (SELECT COUNT(DISTINCT 12)) FROM t1 GROUP BY t1.a; (SELECT COUNT(DISTINCT 12)) 1 1 SELECT AVG(2), BIT_AND(2), BIT_OR(2), BIT_XOR(2), COUNT(*), COUNT(12), COUNT(DISTINCT 12), MIN(2),MAX(2),STD(2), VARIANCE(2),SUM(2), GROUP_CONCAT(2),GROUP_CONCAT(DISTINCT 2); AVG(2) BIT_AND(2) BIT_OR(2) BIT_XOR(2) COUNT(*) COUNT(12) COUNT(DISTINCT 12) MIN(2) MAX(2) STD(2) VARIANCE(2) SUM(2) GROUP_CONCAT(2) GROUP_CONCAT(DISTINCT 2) 2.00000 2 2 2 1 1 1 2 2 0.00000 0.00000 2 2 2 DROP TABLE t1; create table t2 (ff double); insert into t2 values (2.2); select cast(sum(distinct ff) as decimal(5,2)) from t2; cast(sum(distinct ff) as decimal(5,2)) 2.20 select cast(sum(distinct ff) as signed) from t2; cast(sum(distinct ff) as signed) 2 select cast(variance(ff) as decimal(10,3)) from t2; cast(variance(ff) as decimal(10,3)) 0.000 select cast(min(ff) as decimal(5,2)) from t2; cast(min(ff) as decimal(5,2)) 2.20 create table t1 (df decimal(5,1)); insert into t1 values(1.1); insert into t1 values(2.2); select cast(sum(distinct df) as signed) from t1; cast(sum(distinct df) as signed) 3 select cast(min(df) as signed) from t1; cast(min(df) as signed) 1 select 1e8 * sum(distinct df) from t1; 1e8 * sum(distinct df) 330000000 select 1e8 * min(df) from t1; 1e8 * min(df) 110000000.00000001 create table t3 (ifl int); insert into t3 values(1), (2); select cast(min(ifl) as decimal(5,2)) from t3; cast(min(ifl) as decimal(5,2)) 1.00 drop table t1, t2, t3; CREATE TABLE t1 (id int(11),value1 float(10,2)); INSERT INTO t1 VALUES (1,0.00),(1,1.00), (1,2.00), (2,10.00), (2,11.00), (2,12.00), (2,13.00); select id, stddev_pop(value1), var_pop(value1), stddev_samp(value1), var_samp(value1) from t1 group by id; id stddev_pop(value1) var_pop(value1) stddev_samp(value1) var_samp(value1) 1 0.816497 0.666667 1.000000 1.000000 2 1.118034 1.250000 1.290994 1.666667 DROP TABLE t1; CREATE TABLE t1 (col1 decimal(16,12)); INSERT INTO t1 VALUES (-5.00000000001),(-5.00000000002),(-5.00000000003),(-5.00000000000),(-5.00000000001),(-5.00000000002); insert into t1 select * from t1; select col1,count(col1),sum(col1),avg(col1) from t1 group by col1; col1 count(col1) sum(col1) avg(col1) -5.000000000030 2 -10.000000000060 -5.00000000003000000 -5.000000000020 4 -20.000000000080 -5.00000000002000000 -5.000000000010 4 -20.000000000040 -5.00000000001000000 -5.000000000000 2 -10.000000000000 -5.00000000000000000 DROP TABLE t1; create table t1 (col1 decimal(16,12)); insert into t1 values (-5.00000000001); insert into t1 values (-5.00000000001); select col1,sum(col1),max(col1),min(col1) from t1 group by col1; col1 sum(col1) max(col1) min(col1) -5.000000000010 -10.000000000020 -5.000000000010 -5.000000000010 delete from t1; insert into t1 values (5.00000000001); insert into t1 values (5.00000000001); select col1,sum(col1),max(col1),min(col1) from t1 group by col1; col1 sum(col1) max(col1) min(col1) 5.000000000010 10.000000000020 5.000000000010 5.000000000010 DROP TABLE t1; CREATE TABLE t1 (a VARCHAR(400)); INSERT INTO t1 (a) VALUES ("A"), ("a"), ("a "), ("a "), ("B"), ("b"), ("b "), ("b "); SELECT COUNT(DISTINCT a) FROM t1; COUNT(DISTINCT a) 2 DROP TABLE t1; CREATE TABLE t1 (a int, b int, c int); INSERT INTO t1 (a, b, c) VALUES (1,1,1), (1,1,2), (1,1,3), (1,2,1), (1,2,2), (1,2,3), (1,3,1), (1,3,2), (1,3,3), (2,1,1), (2,1,2), (2,1,3), (2,2,1), (2,2,2), (2,2,3), (2,3,1), (2,3,2), (2,3,3), (3,1,1), (3,1,2), (3,1,3), (3,2,1), (3,2,2), (3,2,3), (3,3,1), (3,3,2), (3,3,3); SELECT b/c as v, a FROM t1 ORDER BY v; v a 0.33333 3 0.33333 1 0.33333 2 0.50000 1 0.50000 2 0.50000 3 0.66667 2 0.66667 1 0.66667 3 1.00000 3 1.00000 2 1.00000 3 1.00000 1 1.00000 2 1.00000 3 1.00000 2 1.00000 1 1.00000 1 1.50000 3 1.50000 2 1.50000 1 2.00000 1 2.00000 3 2.00000 2 3.00000 3 3.00000 2 3.00000 1 SELECT b/c as v, SUM(a) FROM t1 GROUP BY v; v SUM(a) 0.33333 6 0.50000 6 0.66667 6 1.00000 18 1.50000 6 2.00000 6 3.00000 6 SELECT SUM(a) FROM t1 GROUP BY b/c; SUM(a) 6 6 6 18 6 6 6 DROP TABLE t1; set div_precision_increment= @sav_dpi; CREATE TABLE t1 (a INT PRIMARY KEY, b INT); INSERT INTO t1 VALUES (1,1), (2,2); CREATE TABLE t2 (a INT PRIMARY KEY, b INT); INSERT INTO t2 VALUES (1,1), (3,3); SELECT SQL_NO_CACHE (SELECT SUM(c.a) FROM t1 ttt, t2 ccc WHERE ttt.a = ccc.b AND ttt.a = t.a GROUP BY ttt.a) AS minid FROM t1 t, t2 c WHERE t.a = c.b; minid 1 DROP TABLE t1,t2; create table t1 select variance(0); show create table t1; Table Create Table t1 CREATE TABLE t1 ( variance(0) double(8,4) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; create table t1 select stddev(0); show create table t1; Table Create Table t1 CREATE TABLE t1 ( stddev(0) double(8,4) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; create table bug22555 (i smallint primary key auto_increment, s1 smallint, s2 smallint, e decimal(30,10), o double); insert into bug22555 (s1, s2, e, o) values (53, 78, 11.4276528, 6.828112), (17, 78, 5.916793, 1.8502951), (18, 76, 2.679231, 9.17975591), (31, 62, 6.07831, 0.1), (19, 41, 5.37463, 15.1), (83, 73, 14.567426, 7.959222), (92, 53, 6.10151, 13.1856852), (7, 12, 13.92272, 3.442007), (92, 35, 11.95358909, 6.01376678), (38, 84, 2.572, 7.904571); select std(s1/s2) from bug22555 group by i; std(s1/s2) 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 select std(e) from bug22555 group by i; std(e) 0.00000000000000 0.00000000000000 0.00000000000000 0.00000000000000 0.00000000000000 0.00000000000000 0.00000000000000 0.00000000000000 0.00000000000000 0.00000000000000 select std(o) from bug22555 group by i; std(o) 0 0 0 0 0 0 0 0 0 0 drop table bug22555; create table bug22555 (i smallint, s1 smallint, s2 smallint, o1 double, o2 double, e1 decimal, e2 decimal); insert into bug22555 values (1,53,78,53,78,53,78),(2,17,78,17,78,17,78),(3,18,76,18,76,18,76); select i, count(*) from bug22555 group by i; i count(*) 1 1 2 1 3 1 select std(s1/s2) from bug22555 where i=1; std(s1/s2) 0.00000000 select std(s1/s2) from bug22555 where i=2; std(s1/s2) 0.00000000 select std(s1/s2) from bug22555 where i=3; std(s1/s2) 0.00000000 select std(s1/s2) from bug22555 where i=1 group by i; std(s1/s2) 0.00000000 select std(s1/s2) from bug22555 where i=2 group by i; std(s1/s2) 0.00000000 select std(s1/s2) from bug22555 where i=3 group by i; std(s1/s2) 0.00000000 select std(s1/s2) from bug22555 group by i order by i; std(s1/s2) 0.00000000 0.00000000 0.00000000 select i, count(*), std(o1/o2) from bug22555 group by i order by i; i count(*) std(o1/o2) 1 1 0 2 1 0 3 1 0 select i, count(*), std(e1/e2) from bug22555 group by i order by i; i count(*) std(e1/e2) 1 1 0.00000000 2 1 0.00000000 3 1 0.00000000 set @saved_div_precision_increment=@@div_precision_increment; set div_precision_increment=19; select i, count(*), variance(s1/s2) from bug22555 group by i order by i; i count(*) variance(s1/s2) 1 1 0.000000000000000000000000000000 2 1 0.000000000000000000000000000000 3 1 0.000000000000000000000000000000 select i, count(*), variance(o1/o2) from bug22555 group by i order by i; i count(*) variance(o1/o2) 1 1 0 2 1 0 3 1 0 select i, count(*), variance(e1/e2) from bug22555 group by i order by i; i count(*) variance(e1/e2) 1 1 0.000000000000000000000000000000 2 1 0.000000000000000000000000000000 3 1 0.000000000000000000000000000000 select i, count(*), std(s1/s2) from bug22555 group by i order by i; i count(*) std(s1/s2) 1 1 0.000000000000000000000000000000 2 1 0.000000000000000000000000000000 3 1 0.000000000000000000000000000000 select i, count(*), std(o1/o2) from bug22555 group by i order by i; i count(*) std(o1/o2) 1 1 0 2 1 0 3 1 0 select i, count(*), std(e1/e2) from bug22555 group by i order by i; i count(*) std(e1/e2) 1 1 0.000000000000000000000000000000 2 1 0.000000000000000000000000000000 3 1 0.000000000000000000000000000000 set div_precision_increment=20; select i, count(*), variance(s1/s2) from bug22555 group by i order by i; i count(*) variance(s1/s2) 1 1 0.000000000000000000000000000000 2 1 0.000000000000000000000000000000 3 1 0.000000000000000000000000000000 select i, count(*), variance(o1/o2) from bug22555 group by i order by i; i count(*) variance(o1/o2) 1 1 0 2 1 0 3 1 0 select i, count(*), variance(e1/e2) from bug22555 group by i order by i; i count(*) variance(e1/e2) 1 1 0.000000000000000000000000000000 2 1 0.000000000000000000000000000000 3 1 0.000000000000000000000000000000 select i, count(*), std(s1/s2) from bug22555 group by i order by i; i count(*) std(s1/s2) 1 1 0.000000000000000000000000000000 2 1 0.000000000000000000000000000000 3 1 0.000000000000000000000000000000 select i, count(*), std(o1/o2) from bug22555 group by i order by i; i count(*) std(o1/o2) 1 1 0 2 1 0 3 1 0 select i, count(*), std(e1/e2) from bug22555 group by i order by i; i count(*) std(e1/e2) 1 1 0.000000000000000000000000000000 2 1 0.000000000000000000000000000000 3 1 0.000000000000000000000000000000 set @@div_precision_increment=@saved_div_precision_increment; insert into bug22555 values (1,53,78,53,78,53,78),(2,17,78,17,78,17,78),(3,18,76,18,76,18,76); insert into bug22555 values (1,53,78,53,78,53,78),(2,17,78,17,78,17,78),(3,18,76,18,76,18,76); insert into bug22555 values (1,53,78,53,78,53,78),(2,17,78,17,78,17,78),(3,18,76,18,76,18,76); select i, count(*), std(s1/s2) from bug22555 group by i order by i; i count(*) std(s1/s2) 1 4 0.00000000 2 4 0.00000000 3 4 0.00000000 select i, count(*), round(std(o1/o2), 16) from bug22555 group by i order by i; i count(*) round(std(o1/o2), 16) 1 4 0.0000000000000000 2 4 0.0000000000000000 3 4 0.0000000000000000 select i, count(*), std(e1/e2) from bug22555 group by i order by i; i count(*) std(e1/e2) 1 4 0.00000000 2 4 0.00000000 3 4 0.00000000 select std(s1/s2) from bug22555; std(s1/s2) 0.21325764 select std(o1/o2) from bug22555; std(o1/o2) 0.2132576358664934 select std(e1/e2) from bug22555; std(e1/e2) 0.21325764 set @saved_div_precision_increment=@@div_precision_increment; set div_precision_increment=19; select i, count(*), std(s1/s2) from bug22555 group by i order by i; i count(*) std(s1/s2) 1 4 0.000000000000000000000000000000 2 4 0.000000000000000000000000000000 3 4 0.000000000000000000000000000000 select i, count(*), round(std(o1/o2), 16) from bug22555 group by i order by i; i count(*) round(std(o1/o2), 16) 1 4 0.0000000000000000 2 4 0.0000000000000000 3 4 0.0000000000000000 select i, count(*), std(e1/e2) from bug22555 group by i order by i; i count(*) std(e1/e2) 1 4 0.000000000000000000000000000000 2 4 0.000000000000000000000000000000 3 4 0.000000000000000000000000000000 select round(std(s1/s2), 17) from bug22555; round(std(s1/s2), 17) 0.21325763586649340 select std(o1/o2) from bug22555; std(o1/o2) 0.2132576358664934 select round(std(e1/e2), 17) from bug22555; round(std(e1/e2), 17) 0.21325763586649340 set div_precision_increment=20; select i, count(*), std(s1/s2) from bug22555 group by i order by i; i count(*) std(s1/s2) 1 4 0.000000000000000000000000000000 2 4 0.000000000000000000000000000000 3 4 0.000000000000000000000000000000 select i, count(*), round(std(o1/o2), 16) from bug22555 group by i order by i; i count(*) round(std(o1/o2), 16) 1 4 0.0000000000000000 2 4 0.0000000000000000 3 4 0.0000000000000000 select i, count(*), std(e1/e2) from bug22555 group by i order by i; i count(*) std(e1/e2) 1 4 0.000000000000000000000000000000 2 4 0.000000000000000000000000000000 3 4 0.000000000000000000000000000000 select round(std(s1/s2), 17) from bug22555; round(std(s1/s2), 17) 0.21325763586649340 select std(o1/o2) from bug22555; std(o1/o2) 0.2132576358664934 select round(std(e1/e2), 17) from bug22555; round(std(e1/e2), 17) 0.21325763586649340 set @@div_precision_increment=@saved_div_precision_increment; drop table bug22555; create table bug22555 (s smallint, o double, e decimal); insert into bug22555 values (1,1,1),(2,2,2),(3,3,3),(6,6,6),(7,7,7); select var_samp(s), var_pop(s) from bug22555; var_samp(s) var_pop(s) 6.7000 5.3600 select var_samp(o), var_pop(o) from bug22555; var_samp(o) var_pop(o) 6.7 5.36 select var_samp(e), var_pop(e) from bug22555; var_samp(e) var_pop(e) 6.7000 5.3600 drop table bug22555; create table bug22555 (s smallint, o double, e decimal); insert into bug22555 values (null,null,null),(null,null,null); select var_samp(s) as 'null', var_pop(s) as 'null' from bug22555; null null NULL NULL select var_samp(o) as 'null', var_pop(o) as 'null' from bug22555; null null NULL NULL select var_samp(e) as 'null', var_pop(e) as 'null' from bug22555; null null NULL NULL insert into bug22555 values (1,1,1); select var_samp(s) as 'null', var_pop(s) as '0' from bug22555; null 0 NULL 0.0000 select var_samp(o) as 'null', var_pop(o) as '0' from bug22555; null 0 NULL 0 select var_samp(e) as 'null', var_pop(e) as '0' from bug22555; null 0 NULL 0.0000 insert into bug22555 values (2,2,2); select var_samp(s) as '0.5', var_pop(s) as '0.25' from bug22555; 0.5 0.25 0.5000 0.2500 select var_samp(o) as '0.5', var_pop(o) as '0.25' from bug22555; 0.5 0.25 0.5 0.25 select var_samp(e) as '0.5', var_pop(e) as '0.25' from bug22555; 0.5 0.25 0.5000 0.2500 drop table bug22555; create table t1 (a decimal(20)); insert into t1 values (12345678901234567890); select count(a) from t1; count(a) 1 select count(distinct a) from t1; count(distinct a) 1 drop table t1; CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1,1),(1,2),(1,3),(1,4),(1,5),(1,6),(1,7),(1,8); INSERT INTO t1 SELECT a, b+8 FROM t1; INSERT INTO t1 SELECT a, b+16 FROM t1; INSERT INTO t1 SELECT a, b+32 FROM t1; INSERT INTO t1 SELECT a, b+64 FROM t1; INSERT INTO t1 SELECT a, b+128 FROM t1; INSERT INTO t1 SELECT a, b+256 FROM t1; INSERT INTO t1 SELECT a, b+512 FROM t1; INSERT INTO t1 SELECT a, b+1024 FROM t1; INSERT INTO t1 SELECT a, b+2048 FROM t1; INSERT INTO t1 SELECT a, b+4096 FROM t1; INSERT INTO t1 SELECT a, b+8192 FROM t1; INSERT INTO t1 SELECT a, b+16384 FROM t1; INSERT INTO t1 SELECT a, b+32768 FROM t1; SELECT a,COUNT(DISTINCT b) AS cnt FROM t1 GROUP BY a HAVING cnt > 50; a cnt 1 65536 SELECT a,SUM(DISTINCT b) AS sumation FROM t1 GROUP BY a HAVING sumation > 50; a sumation 1 2147516416 SELECT a,AVG(DISTINCT b) AS average FROM t1 GROUP BY a HAVING average > 50; a average 1 32768.5000 DROP TABLE t1; CREATE TABLE t1 ( a INT, b INT, KEY(a) ); INSERT INTO t1 VALUES (NULL, 1), (NULL, 2); EXPLAIN SELECT MIN(a), MIN(b) FROM t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 SELECT MIN(a), MIN(b) FROM t1; MIN(a) MIN(b) NULL 1 CREATE TABLE t2( a INT, b INT, c INT, KEY(a, b) ); INSERT INTO t2 ( a, b, c ) VALUES ( 1, NULL, 2 ), ( 1, 3, 4 ), ( 1, 4, 4 ); EXPLAIN SELECT MIN(b), MIN(c) FROM t2 WHERE a = 1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ref a a 5 const 2 SELECT MIN(b), MIN(c) FROM t2 WHERE a = 1; MIN(b) MIN(c) 3 2 CREATE TABLE t3 (a INT, b INT, c int, KEY(a, b)); INSERT INTO t3 VALUES (1, NULL, 1), (2, NULL, 2), (2, NULL, 2), (3, NULL, 3); EXPLAIN SELECT MIN(a), MIN(b) FROM t3 where a = 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away SELECT MIN(a), MIN(b) FROM t3 where a = 2; MIN(a) MIN(b) 2 NULL CREATE TABLE t4 (a INT, b INT, c int, KEY(a, b)); INSERT INTO t4 VALUES (1, 1, 1), (2, NULL, 2), (2, NULL, 2), (3, 1, 3); EXPLAIN SELECT MIN(a), MIN(b) FROM t4 where a = 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away SELECT MIN(a), MIN(b) FROM t4 where a = 2; MIN(a) MIN(b) 2 NULL SELECT MIN(b), min(c) FROM t4 where a = 2; MIN(b) min(c) NULL 2 CREATE TABLE t5( a INT, b INT, KEY( a, b) ); INSERT INTO t5 VALUES( 1, 1 ), ( 1, 2 ); EXPLAIN SELECT MIN(a), MIN(b) FROM t5 WHERE a = 1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away SELECT MIN(a), MIN(b) FROM t5 WHERE a = 1; MIN(a) MIN(b) 1 1 SELECT MIN(a), MIN(b) FROM t5 WHERE a = 1 and b > 1; MIN(a) MIN(b) 1 2 DROP TABLE t1, t2, t3, t4, t5; CREATE TABLE t1 (a INT); INSERT INTO t1 values (),(),(); SELECT (SELECT SLEEP(0) FROM t1 ORDER BY AVG(DISTINCT a) ) as x FROM t1 GROUP BY x; x 0 SELECT 1 FROM t1 GROUP BY (SELECT SLEEP(0) FROM t1 ORDER BY AVG(DISTINCT a) ); 1 1 DROP TABLE t1; CREATE TABLE t1 (a int, b date NOT NULL, KEY k1 (a,b)); SELECT MIN(b) FROM t1 WHERE a=1 AND b>'2007-08-01'; MIN(b) NULL DROP TABLE t1; CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1),(2),(3),(4); SET SQL_MODE=ONLY_FULL_GROUP_BY; SELECT a FROM t1 HAVING COUNT(*)>2; ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause SELECT COUNT(*), a FROM t1; ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause SET SQL_MODE=DEFAULT; SELECT a FROM t1 HAVING COUNT(*)>2; a 1 SELECT COUNT(*), a FROM t1; COUNT(*) a 4 1 DROP TABLE t1; set SQL_MODE=ONLY_FULL_GROUP_BY; CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1),(2),(3),(4); CREATE VIEW v1 AS SELECT a,(a + 1) AS y FROM t1; EXPLAIN EXTENDED SELECT y FROM v1 GROUP BY v1.y; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 4 100.00 Using temporary; Using filesort Warnings: Note 1003 select (test.t1.a + 1) AS y from test.t1 group by (test.t1.a + 1) DROP VIEW v1; DROP TABLE t1; SET SQL_MODE=DEFAULT; CREATE TABLE t1(a DOUBLE); INSERT INTO t1 VALUES (10), (20); SELECT AVG(a), CAST(AVG(a) AS DECIMAL) FROM t1; AVG(a) CAST(AVG(a) AS DECIMAL) 15 15 DROP TABLE t1; CREATE TABLE derived1 (a bigint(21)); INSERT INTO derived1 VALUES (2); CREATE TABLE D ( pk int(11) NOT NULL AUTO_INCREMENT, int_nokey int(11) DEFAULT NULL, int_key int(11) DEFAULT NULL, filler blob, PRIMARY KEY (pk), KEY int_key (int_key) ); INSERT INTO D VALUES (39,40,4,repeat(' X', 42)), (43,56,4,repeat(' X', 42)), (47,12,4,repeat(' X', 42)), (71,28,4,repeat(' X', 42)), (76,54,4,repeat(' X', 42)), (83,45,4,repeat(' X', 42)), (105,53,12,NULL); SELECT (SELECT COUNT( int_nokey ) FROM derived1 AS X WHERE X.int_nokey < 61 GROUP BY pk LIMIT 1) FROM D AS X WHERE X.int_key < 13 GROUP BY int_nokey LIMIT 1; (SELECT COUNT( int_nokey ) FROM derived1 AS X WHERE X.int_nokey < 61 GROUP BY pk LIMIT 1) 1 DROP TABLE derived1; DROP TABLE D; CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1,1), (1,2), (1,3); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (3),(4); SET SQL_MODE='ONLY_FULL_GROUP_BY'; SELECT COUNT(*) FROM t1; COUNT(*) 3 SELECT COUNT(*) FROM t1 where a=1; COUNT(*) 3 SELECT COUNT(*),a FROM t1; ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause SELECT COUNT(*) FROM t1 a JOIN t1 b ON a.a= b.a; COUNT(*) 9 SELECT COUNT(*), (SELECT count(*) FROM t1 inr WHERE inr.a = outr.a) FROM t1 outr; ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause SELECT COUNT(*) FROM t1 outr, (SELECT b, count(*) FROM t2) as t3; ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause SELECT COUNT(*) FROM t1 outr where (1,1) in (SELECT a, count(*) FROM t2); COUNT(*) 0 SELECT COUNT(*) FROM t1 a JOIN t1 outr ON a.a= (SELECT count(*) FROM t1 inr WHERE inr.a = outr.a); COUNT(*) 0 SELECT * FROM (SELECT a FROM t1 GROUP BY a) sq JOIN t2 ON a = b; a b SET SQL_MODE=default; DROP TABLE t1,t2; End of 5.0 tests # # BUG#47280 - strange results from count(*) with order by multiple # columns without where/group # # # Initialize test # CREATE TABLE t1 ( pk INT NOT NULL, i INT, PRIMARY KEY (pk) ); INSERT INTO t1 VALUES (1,11),(2,12),(3,13); # # Start test # All the following queries shall return 1 record # # Masking all correct values {11...13} for column i in this result. SELECT MAX(pk) as max, i FROM t1 ORDER BY max; max i 3 # EXPLAIN SELECT MAX(pk) as max, i FROM t1 ORDER BY max; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using temporary # Only 11 is correct for collumn i in this result SELECT MAX(pk) as max, i FROM t1 WHERE pk<2 ORDER BY max; max i 1 11 # # Cleanup # DROP TABLE t1; # # Bug#43668: Wrong comparison and MIN/MAX for YEAR(2) # create table t1 (f1 year(2), f2 year(4), f3 date, f4 datetime); Warnings: Note 1287 'YEAR(2)' is deprecated and will be removed in a future release. Please use YEAR(4) instead insert into t1 values (98,1998,19980101,"1998-01-01 00:00:00"), (00,2000,20000101,"2000-01-01 00:00:01"), (02,2002,20020101,"2002-01-01 23:59:59"), (60,2060,20600101,"2060-01-01 11:11:11"), (70,1970,19700101,"1970-11-11 22:22:22"), (NULL,NULL,NULL,NULL), (71,1971,19710101,"1971-11-11 22:22:22"); select min(f1),max(f1) from t1; min(f1) max(f1) 70 60 select min(f2),max(f2) from t1; min(f2) max(f2) 1970 2060 select min(f3),max(f3) from t1; min(f3) max(f3) 1970-01-01 2060-01-01 select min(f4),max(f4) from t1; min(f4) max(f4) 1970-11-11 22:22:22 2060-01-01 11:11:11 select a.f1 as a, b.f1 as b, a.f1 > b.f1 as gt, a.f1 < b.f1 as lt, a.f1<=>b.f1 as eq from t1 a, t1 b; a b gt lt eq 98 98 0 0 1 00 98 1 0 0 02 98 1 0 0 60 98 1 0 0 70 98 0 1 0 NULL 98 NULL NULL 0 71 98 0 1 0 98 00 0 1 0 00 00 0 0 1 02 00 1 0 0 60 00 1 0 0 70 00 0 1 0 NULL 00 NULL NULL 0 71 00 0 1 0 98 02 0 1 0 00 02 0 1 0 02 02 0 0 1 60 02 1 0 0 70 02 0 1 0 NULL 02 NULL NULL 0 71 02 0 1 0 98 60 0 1 0 00 60 0 1 0 02 60 0 1 0 60 60 0 0 1 70 60 0 1 0 NULL 60 NULL NULL 0 71 60 0 1 0 98 70 1 0 0 00 70 1 0 0 02 70 1 0 0 60 70 1 0 0 70 70 0 0 1 NULL 70 NULL NULL 0 71 70 1 0 0 98 NULL NULL NULL 0 00 NULL NULL NULL 0 02 NULL NULL NULL 0 60 NULL NULL NULL 0 70 NULL NULL NULL 0 NULL NULL NULL NULL 1 71 NULL NULL NULL 0 98 71 1 0 0 00 71 1 0 0 02 71 1 0 0 60 71 1 0 0 70 71 0 1 0 NULL 71 NULL NULL 0 71 71 0 0 1 select a.f1 as a, b.f2 as b, a.f1 > b.f2 as gt, a.f1 < b.f2 as lt, a.f1<=>b.f2 as eq from t1 a, t1 b; a b gt lt eq 98 1998 0 0 1 00 1998 1 0 0 02 1998 1 0 0 60 1998 1 0 0 70 1998 0 1 0 NULL 1998 NULL NULL 0 71 1998 0 1 0 98 2000 0 1 0 00 2000 0 0 1 02 2000 1 0 0 60 2000 1 0 0 70 2000 0 1 0 NULL 2000 NULL NULL 0 71 2000 0 1 0 98 2002 0 1 0 00 2002 0 1 0 02 2002 0 0 1 60 2002 1 0 0 70 2002 0 1 0 NULL 2002 NULL NULL 0 71 2002 0 1 0 98 2060 0 1 0 00 2060 0 1 0 02 2060 0 1 0 60 2060 0 0 1 70 2060 0 1 0 NULL 2060 NULL NULL 0 71 2060 0 1 0 98 1970 1 0 0 00 1970 1 0 0 02 1970 1 0 0 60 1970 1 0 0 70 1970 0 0 1 NULL 1970 NULL NULL 0 71 1970 1 0 0 98 NULL NULL NULL 0 00 NULL NULL NULL 0 02 NULL NULL NULL 0 60 NULL NULL NULL 0 70 NULL NULL NULL 0 NULL NULL NULL NULL 1 71 NULL NULL NULL 0 98 1971 1 0 0 00 1971 1 0 0 02 1971 1 0 0 60 1971 1 0 0 70 1971 0 1 0 NULL 1971 NULL NULL 0 71 1971 0 0 1 select a.f1 as a, b.f3 as b, a.f1 > b.f3 as gt, a.f1 < b.f3 as lt, a.f1<=>b.f3 as eq from t1 a, t1 b; a b gt lt eq 98 1998-01-01 0 1 0 00 1998-01-01 1 0 0 02 1998-01-01 1 0 0 60 1998-01-01 1 0 0 70 1998-01-01 0 1 0 NULL 1998-01-01 NULL NULL 0 71 1998-01-01 0 1 0 98 2000-01-01 0 1 0 00 2000-01-01 0 1 0 02 2000-01-01 1 0 0 60 2000-01-01 1 0 0 70 2000-01-01 0 1 0 NULL 2000-01-01 NULL NULL 0 71 2000-01-01 0 1 0 98 2002-01-01 0 1 0 00 2002-01-01 0 1 0 02 2002-01-01 0 1 0 60 2002-01-01 1 0 0 70 2002-01-01 0 1 0 NULL 2002-01-01 NULL NULL 0 71 2002-01-01 0 1 0 98 2060-01-01 0 1 0 00 2060-01-01 0 1 0 02 2060-01-01 0 1 0 60 2060-01-01 0 1 0 70 2060-01-01 0 1 0 NULL 2060-01-01 NULL NULL 0 71 2060-01-01 0 1 0 98 1970-01-01 1 0 0 00 1970-01-01 1 0 0 02 1970-01-01 1 0 0 60 1970-01-01 1 0 0 70 1970-01-01 0 1 0 NULL 1970-01-01 NULL NULL 0 71 1970-01-01 1 0 0 98 NULL NULL NULL 0 00 NULL NULL NULL 0 02 NULL NULL NULL 0 60 NULL NULL NULL 0 70 NULL NULL NULL 0 NULL NULL NULL NULL 1 71 NULL NULL NULL 0 98 1971-01-01 1 0 0 00 1971-01-01 1 0 0 02 1971-01-01 1 0 0 60 1971-01-01 1 0 0 70 1971-01-01 0 1 0 NULL 1971-01-01 NULL NULL 0 71 1971-01-01 0 1 0 select a.f1 as a, b.f4 as b, a.f1 > b.f4 as gt, a.f1 < b.f4 as lt, a.f1<=>b.f4 as eq from t1 a, t1 b; a b gt lt eq 98 1998-01-01 00:00:00 0 1 0 00 1998-01-01 00:00:00 1 0 0 02 1998-01-01 00:00:00 1 0 0 60 1998-01-01 00:00:00 1 0 0 70 1998-01-01 00:00:00 0 1 0 NULL 1998-01-01 00:00:00 NULL NULL 0 71 1998-01-01 00:00:00 0 1 0 98 2000-01-01 00:00:01 0 1 0 00 2000-01-01 00:00:01 0 1 0 02 2000-01-01 00:00:01 1 0 0 60 2000-01-01 00:00:01 1 0 0 70 2000-01-01 00:00:01 0 1 0 NULL 2000-01-01 00:00:01 NULL NULL 0 71 2000-01-01 00:00:01 0 1 0 98 2002-01-01 23:59:59 0 1 0 00 2002-01-01 23:59:59 0 1 0 02 2002-01-01 23:59:59 0 1 0 60 2002-01-01 23:59:59 1 0 0 70 2002-01-01 23:59:59 0 1 0 NULL 2002-01-01 23:59:59 NULL NULL 0 71 2002-01-01 23:59:59 0 1 0 98 2060-01-01 11:11:11 0 1 0 00 2060-01-01 11:11:11 0 1 0 02 2060-01-01 11:11:11 0 1 0 60 2060-01-01 11:11:11 0 1 0 70 2060-01-01 11:11:11 0 1 0 NULL 2060-01-01 11:11:11 NULL NULL 0 71 2060-01-01 11:11:11 0 1 0 98 1970-11-11 22:22:22 1 0 0 00 1970-11-11 22:22:22 1 0 0 02 1970-11-11 22:22:22 1 0 0 60 1970-11-11 22:22:22 1 0 0 70 1970-11-11 22:22:22 0 1 0 NULL 1970-11-11 22:22:22 NULL NULL 0 71 1970-11-11 22:22:22 1 0 0 98 NULL NULL NULL 0 00 NULL NULL NULL 0 02 NULL NULL NULL 0 60 NULL NULL NULL 0 70 NULL NULL NULL 0 NULL NULL NULL NULL 1 71 NULL NULL NULL 0 98 1971-11-11 22:22:22 1 0 0 00 1971-11-11 22:22:22 1 0 0 02 1971-11-11 22:22:22 1 0 0 60 1971-11-11 22:22:22 1 0 0 70 1971-11-11 22:22:22 0 1 0 NULL 1971-11-11 22:22:22 NULL NULL 0 71 1971-11-11 22:22:22 0 1 0 select *, f1 = f2 from t1; f1 f2 f3 f4 f1 = f2 98 1998 1998-01-01 1998-01-01 00:00:00 1 00 2000 2000-01-01 2000-01-01 00:00:01 1 02 2002 2002-01-01 2002-01-01 23:59:59 1 60 2060 2060-01-01 2060-01-01 11:11:11 1 70 1970 1970-01-01 1970-11-11 22:22:22 1 NULL NULL NULL NULL NULL 71 1971 1971-01-01 1971-11-11 22:22:22 1 drop table t1; # # Bug #54465: assert: field_types == 0 || field_types[field_pos] == # MYSQL_TYPE_LONGLONG # CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2); SELECT MAX((SELECT 1 FROM t1 ORDER BY @var LIMIT 1)) m FROM t1 t2, t1 ORDER BY t1.a; m 1 DROP TABLE t1; # # Bug#58030 crash in Item_func_geometry_from_text::val_str # SELECT MAX(TIMESTAMP(RAND(0))); SELECT MIN(TIMESTAMP(RAND(0))); # # Bug#58177 crash and valgrind warnings in decimal and protocol sending functions... # SELECT MIN(GET_LOCK('aaaaaaaaaaaaaaaaa',0) / '0b1111111111111111111111111111111111111111111111111111111111111111111111111' ^ (RAND())); SELECT MIN(GET_LOCK('aaaaaaaaaaaaaaaaa',0) / '0b1111111111111111111111111111111111111111111111111111111111111111111111111' ^ (RAND())); SELECT MIN(GET_LOCK('aaaaaaaaaaaaaaaaa',0) / '0b1111111111111111111111111111111111111111111111111111111111111111111111111' ^ (RAND())); SELECT MIN(GET_LOCK('aaaaaaaaaaaaaaaaa',0) / '0b1111111111111111111111111111111111111111111111111111111111111111111111111' ^ (RAND())); SELECT RELEASE_LOCK('aaaaaaaaaaaaaaaaa'); # # Bug #11766094 - 59132: MIN() AND MAX() REMOVE UNSIGNEDNESS # CREATE TABLE t1 (a BIGINT UNSIGNED); INSERT INTO t1 VALUES (18446668621106209655); SELECT MAX(LENGTH(a)), LENGTH(MAX(a)), MIN(a), MAX(a), CONCAT(MIN(a)), CONCAT(MAX(a)) FROM t1; MAX(LENGTH(a)) LENGTH(MAX(a)) MIN(a) MAX(a) CONCAT(MIN(a)) CONCAT(MAX(a)) 20 20 18446668621106209655 18446668621106209655 18446668621106209655 18446668621106209655 DROP TABLE t1; # # Bug #11766270 59343: YEAR(4): INCORRECT RESULT AND VALGRIND WARNINGS WITH MIN/MAX, UNION # CREATE TABLE t1(f1 YEAR(4)); INSERT INTO t1 VALUES (0000),(2001); (SELECT MAX(f1) FROM t1) UNION (SELECT MAX(f1) FROM t1); Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr def MAX(f1) MAX(f1) 13 4 4 Y 32864 0 63 MAX(f1) 2001 DROP TABLE t1; # # LP BUG#813418 - incorrect optimisation of max/min by index for # negated BETWEEN CREATE TABLE t1 (a int, KEY (a)); INSERT INTO t1 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10); SELECT MAX(a) FROM t1 WHERE a NOT BETWEEN 3 AND 9; MAX(a) 10 drop table t1; # End of 5.1 tests # # Bug #904345: MIN/MAX optimization with constant FALSE condition # CREATE TABLE t1 (a int NOT NULL, KEY(a)); INSERT INTO t1 VALUES (10), (8), (11), (7), (15), (12), (9); CREATE TABLE t2 (a int, b int); INSERT INTO t2 VALUES (8,2), (6,9), (8,4), (5,3), (9,1); EXPLAIN EXTENDED SELECT MAX(a) FROM t1 WHERE (1,2) IN (SELECT 3,4) AND a<10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select max(test.t1.a) AS MAX(a) from test.t1 where 0 SELECT MAX(a) FROM t1 WHERE (1,2) IN (SELECT 3,4) AND a<10; MAX(a) NULL EXPLAIN EXTENDED SELECT MAX(a) FROM t1 WHERE (1,2) IN (SELECT a,b FROM t2 WHERE b<5) and a<10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY eq_ref distinct_key distinct_key 8 func,func 1 100.00 1 PRIMARY t1 range a a 4 NULL 4 100.00 Using where; Using index; Using join buffer (flat, BNL join) 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 5 100.00 Using where Warnings: Note 1003 select max(test.t1.a) AS MAX(a) from test.t1 semi join (test.t2) where ((test.t2.a = 1) and (test.t2.b = 2) and (test.t1.a < 10)) SELECT MAX(a) FROM t1 WHERE (1,2) IN (SELECT a,b FROM t2 WHERE b<5) and a<10; MAX(a) NULL EXPLAIN EXTENDED SELECT MAX(a) FROM t1 WHERE RAND()*0<>0 AND a<10; id select_type table type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 range a a 4 NULL 4 100.00 Using where; Using index Warnings: Note 1003 select max(test.t1.a) AS MAX(a) from test.t1 where (((rand() * 0) <> 0) and (test.t1.a < 10)) SELECT MAX(a) FROM t1 WHERE RAND()*0<>0 AND a<10; MAX(a) NULL DROP TABLE t1,t2; # # Bug #879860: MIN/MAX for subquery returning empty set # CREATE TABLE t1 (a int PRIMARY KEY); INSERT INTO t1 VALUES (1); CREATE TABLE t2 (a int NOT NULL); INSERT INTO t2 VALUES (10); CREATE TABLE t3 ( a int, b int); INSERT INTO t3 VALUES (19,1), (20,5); EXPLAIN EXTENDED SELECT (SELECT MIN(t1.a) FROM t1,t2 WHERE t2.a = t3.b) FROM t3; id select_type table type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t3 ALL NULL NULL NULL NULL 2 100.00 2 DEPENDENT SUBQUERY t1 system NULL NULL NULL NULL 1 100.00 2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1 100.00 Warnings: Note 1276 Field or reference 'test.t3.b' of SELECT #2 was resolved in SELECT #1 Note 1003 select <test.t3.b>((select min(1) from dual where (10 = test.t3.b))) AS (SELECT MIN(t1.a) FROM t1,t2 WHERE t2.a = t3.b) from test.t3 SELECT (SELECT MIN(t1.a) FROM t1,t2 WHERE t2.a = t3.b) FROM t3; (SELECT MIN(t1.a) FROM t1,t2 WHERE t2.a = t3.b) NULL NULL DROP TABLE t1,t2,t3; # # Bug #884175: MIN/MAX for short varchar = long const # CREATE TABLE t1 (f1 varchar(1), f2 varchar(1), KEY (f2)); INSERT INTO t1 VALUES ('b', 'b'), ('a','a'); EXPLAIN SELECT MAX(f1) FROM t1 WHERE f1 = 'abc'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where SELECT MAX(f1) FROM t1 WHERE f1 = 'abc'; MAX(f1) NULL EXPLAIN SELECT MAX(f2) FROM t1 WHERE f2 = 'abc'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref f2 f2 4 const 1 Using where; Using index SELECT MAX(f2) FROM t1 WHERE f2 = 'abc'; MAX(f2) NULL EXPLAIN SELECT MIN(f1) FROM t1 WHERE f1 >= 'abc'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where SELECT MIN(f1) FROM t1 WHERE f1 >= 'abc'; MIN(f1) b EXPLAIN SELECT MIN(f2) FROM t1 WHERE f2 >= 'abc'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index f2 f2 4 NULL 2 Using where; Using index SELECT MIN(f2) FROM t1 WHERE f2 >= 'abc'; MIN(f2) b EXPLAIN SELECT MIN(f1) FROM t1 WHERE f1 BETWEEN 'abc' AND 'b' ; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where SELECT MIN(f1) FROM t1 WHERE f1 BETWEEN 'abc' AND 'b' ; MIN(f1) b EXPLAIN SELECT MIN(f2) FROM t1 WHERE f2 BETWEEN 'abc' AND 'b' ; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index f2 f2 4 NULL 2 Using where; Using index SELECT MIN(f2) FROM t1 WHERE f2 BETWEEN 'abc' AND 'b' ; MIN(f2) b DROP TABLE t1; End of 5.2 tests # # BUG#46680 - Assertion failed in file item_subselect.cc, # line 305 crashing on HAVING subquery # # Create tables # CREATE TABLE t1 ( pk INT, v VARCHAR(1) DEFAULT NULL, PRIMARY KEY(pk) ); CREATE TABLE t2 LIKE t1; CREATE TABLE t3 LIKE t1; CREATE TABLE empty1 (a int); INSERT INTO t1 VALUES (1,'c'),(2,NULL); INSERT INTO t2 VALUES (3,'m'),(4,NULL); INSERT INTO t3 VALUES (1,'n'); set @save_optimizer_switch=@@optimizer_switch; set @@optimizer_switch='materialization=on,in_to_exists=off,semijoin=off'; # # 1) Test that subquery materialization is setup for query with # premature optimize() exit due to "Impossible WHERE" # SELECT MIN(t2.pk) FROM t2 JOIN t1 ON t1.pk=t2.pk WHERE 'j' HAVING ('m') IN ( SELECT v FROM t2); MIN(t2.pk) NULL Warnings: Warning 1292 Truncated incorrect INTEGER value: 'j' Warning 1292 Truncated incorrect INTEGER value: 'j' EXPLAIN SELECT MIN(t2.pk) FROM t2 JOIN t1 ON t1.pk=t2.pk WHERE 'j' HAVING ('m') IN ( SELECT v FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 Warnings: Warning 1292 Truncated incorrect INTEGER value: 'j' Warning 1292 Truncated incorrect INTEGER value: 'j' # # 2) Test that subquery materialization is setup for query with # premature optimize() exit due to "No matching min/max row" # SELECT MIN(t2.pk) FROM t2 WHERE t2.pk>10 HAVING ('m') IN ( SELECT v FROM t2); MIN(t2.pk) NULL EXPLAIN SELECT MIN(t2.pk) FROM t2 WHERE t2.pk>10 HAVING ('m') IN ( SELECT v FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No matching min/max row 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 # # 3) Test that subquery materialization is setup for query with # premature optimize() exit due to "Select tables optimized away" # SELECT MIN(pk) FROM t1 WHERE pk=NULL HAVING ('m') IN ( SELECT v FROM t2); MIN(pk) NULL EXPLAIN SELECT MIN(pk) FROM t1 WHERE pk=NULL HAVING ('m') IN ( SELECT v FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 # # 4) Test that subquery materialization is setup for query with # premature optimize() exit due to "No matching row in const table" # SELECT MIN(a) FROM (SELECT a FROM empty1) tt HAVING ('m') IN ( SELECT v FROM t2); MIN(a) NULL set @tmp_optimizer_switch=@@optimizer_switch; set optimizer_switch='derived_merge=off,derived_with_keys=off'; EXPLAIN SELECT MIN(a) FROM (SELECT a FROM empty1) tt HAVING ('m') IN ( SELECT v FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY system NULL NULL NULL NULL 0 const row not found 3 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 2 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table set optimizer_switch=@tmp_optimizer_switch; # # 5) Test that subquery materialization is setup for query with # premature optimize() exit due to "Impossible WHERE noticed # after reading const tables" # SELECT min(t1.pk) FROM t1 WHERE t1.pk IN (SELECT 1 from t3 where pk>10) HAVING ('m') IN ( SELECT v FROM t2); min(t1.pk) NULL EXPLAIN SELECT min(t1.pk) FROM t1 WHERE t1.pk IN (SELECT 1 from t3 where pk>10) HAVING ('m') IN ( SELECT v FROM t2); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t1 index NULL PRIMARY 4 NULL 2 Using where; Using index 3 MATERIALIZED t2 ALL NULL NULL NULL NULL 2 2 MATERIALIZED NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables set @@optimizer_switch=@save_optimizer_switch; # # Cleanup for BUG#46680 # DROP TABLE IF EXISTS t1,t2,t3,empty1; create table t1 (i int, d date); insert into t1 values (1, '2008-10-02'), (2, '2010-12-12'); select avg(export_set( 3, 'y', sha(i))), group_concat(d) from t1 group by d order by i; avg(export_set( 3, 'y', sha(i))) group_concat(d) 0 2008-10-02 0 2010-12-12 drop table t1; # # MDEV-4290: crash in st_select_lex::mark_as_dependent # create table t1(a int); select 1 from t1 v1 right join t1 on count(*); ERROR HY000: Invalid use of group function select 1 from t1 order by ( select 1 from ( select 1 from t1 v1 right join t1 on count(*) ) v ); ERROR HY000: Invalid use of group function insert into t1 values (1),(1),(2),(2); select count(*) from t1; count(*) 4 select z from (select count(*) as z from t1) v; z 4 # next is how it implemented now (may be changed in case of dependent # derived tables) select z from (select count(*) as z from t1) v group by 1; z 4 drop table t1; CREATE TABLE t1 (i1 int, INDEX(i1)); INSERT INTO t1 VALUES (9),(8); CREATE TABLE t2 (i2 int); INSERT INTO t2 VALUES (8),(4); CREATE TABLE t3 (i3 int, INDEX(i3)); INSERT INTO t3 VALUES (9),(8); SELECT MAX(t3.i3) FROM t3, t2, t1 WHERE t1.i1 = t2.i2 AND ( 0 OR t3.i3 = t2.i2 ); MAX(t3.i3) 8 SELECT MAX(t3.i3) FROM t3, t2, t1 WHERE t1.i1 = t2.i2 AND t3.i3 = t2.i2; MAX(t3.i3) 8 DROP TABLE t1,t2,t3; # end of 5.3 tests # # Bug#52123 Assertion failed: aggregator == aggr->Aggrtype(), # file .\item_sum.cc, line 587 # CREATE TABLE t1(a int, KEY(a)); INSERT INTO t1 VALUES (1), (2); SELECT 1 FROM t1 ORDER BY AVG(DISTINCT a); 1 1 DROP TABLE t1; # # Bug#55648: Server crash on MIN/MAX on maximum time value # CREATE TABLE t1(c1 TIME NOT NULL); INSERT INTO t1 VALUES('837:59:59'); INSERT INTO t1 VALUES('838:59:59'); SELECT MAX(c1) FROM t1; MAX(c1) 838:59:59 DROP TABLE t1; # End of the bug#55648 # # Bug#56120: Failed assertion on MIN/MAX on negative time value # CREATE TABLE t1(c1 TIME NOT NULL); INSERT INTO t1 VALUES('-00:00:01'); SELECT MAX(c1),MIN(c1) FROM t1; MAX(c1) MIN(c1) -00:00:01 -00:00:01 DROP TABLE t1; # End of the bug#56120 # # Bug#57932 "query with AVG(DISTINCT) returns NULL if last # aggregated value was NULL" # CREATE TABLE t1 (col_int_nokey int(11)); INSERT INTO t1 VALUES (7),(8),(NULL); SELECT AVG(DISTINCT col_int_nokey) FROM t1; AVG(DISTINCT col_int_nokey) 7.5000 SELECT AVG(DISTINCT outr.col_int_nokey) FROM t1 AS outr LEFT JOIN t1 AS outr2 ON outr.col_int_nokey = outr2.col_int_nokey; AVG(DISTINCT outr.col_int_nokey) 7.5000 DROP TABLE t1; # End of the bug#57932 # # MDEV-5257: MIN/MAX Optimization (Select tables optimized away) does not work for DateTime # MDEV-3855: MIN/MAX optimization doesnt work for int_col > INET_ATON # (correct the fix for Bug #884175) # CREATE TABLE t1 ( a int(11) NOT NULL AUTO_INCREMENT, b datetime DEFAULT NULL, PRIMARY KEY (a), KEY idx_b (b) ); INSERT INTO t1 (b) VALUES ('2013-01-06 23:59:59'); INSERT INTO t1 (b) VALUES ('2013-02-06 23:59:59'); INSERT INTO t1 (b) VALUES ('2013-03-06 23:59:59'); INSERT INTO t1 (b) VALUES ('2013-04-06 23:59:59'); INSERT INTO t1 (b) VALUES ('2013-05-06 23:59:59'); INSERT INTO t1 (b) VALUES ('2013-06-06 23:59:59'); INSERT INTO t1 (b) VALUES ('2013-07-06 23:59:59'); # The following should produce "Select tables optimized away" EXPLAIN SELECT MIN(b) FROM t1 WHERE b <= '2013-11-06 23:59:59'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away set names utf8; # Should be the same as above: EXPLAIN SELECT MIN(b) FROM t1 WHERE b <= '2013-11-06 23:59:59'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away DROP TABLE t1; CREATE TABLE t1 ( a int(11) NOT NULL AUTO_INCREMENT, b bigint(20) DEFAULT NULL, PRIMARY KEY (a), KEY idx_b (b) ); insert into t1 (b) values (INET_ATON('192.168.0.1')); insert into t1 (b) values (INET_ATON('192.168.0.2')); insert into t1 (b) values (INET_ATON('192.168.0.3')); insert into t1 (b) values (INET_ATON('192.168.0.4')); insert into t1 (b) values (INET_ATON('192.168.200.200')); # should show "Select tables optimized away" explain select MIN(b) from t1 where b >= inet_aton('192.168.119.32'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away DROP TABLE t1; # # MDEV-6743 crash in GROUP_CONCAT(IF () ORDER BY 1) # CREATE TABLE t1 (pk INT, t2_id INT, t5_id INT, PRIMARY KEY (pk)); INSERT INTO t1 VALUES (1,3,12),(2,3,15); CREATE TABLE t2 (pk INT, PRIMARY KEY (pk)); INSERT INTO t2 VALUES (4),(5); CREATE TABLE t3 (t2_id INT, t4_id INT); INSERT INTO t3 VALUES (6,11),(7,12); CREATE TABLE t4 (id INT); INSERT INTO t4 VALUES (13),(14); CREATE TABLE t5 (pk INT, f VARCHAR(50), t6_id INT, PRIMARY KEY (pk)); INSERT INTO t5 VALUES (9,'FOO',NULL); CREATE TABLE t6 (pk INT, f VARCHAR(120), b TINYINT(4), PRIMARY KEY (pk)); PREPARE stmt FROM " SELECT t1.t2_id, GROUP_CONCAT(IF (t6.b, t6.f, t5.f) ORDER BY 1) FROM t1 JOIN t2 ON t1.t2_id = t2.pk JOIN t3 ON t2.pk = t3.t2_id JOIN t4 ON t4.id = t3.t4_id JOIN t5 ON t1.t5_id = t5.pk LEFT JOIN t6 ON t6.pk = t5.t6_id GROUP BY t1.t2_id "; EXECUTE stmt; t2_id GROUP_CONCAT(IF (t6.b, t6.f, t5.f) ORDER BY 1) EXECUTE stmt; t2_id GROUP_CONCAT(IF (t6.b, t6.f, t5.f) ORDER BY 1) EXECUTE stmt; t2_id GROUP_CONCAT(IF (t6.b, t6.f, t5.f) ORDER BY 1) DROP TABLE t1,t2,t3,t4,t5,t6;