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create table t1 (USR_ID integer not null, MAX_REQ integer not null, constraint PK_SEA_USER primary key (USR_ID)) engine=InnoDB; insert into t1 values (1, 3); select count(*) + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ from t1 group by MAX_REQ; count(*) + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ 1 select Case When Count(*) < MAX_REQ Then 1 Else 0 End from t1 where t1.USR_ID = 1 group by MAX_REQ; Case When Count(*) < MAX_REQ Then 1 Else 0 End 1 drop table t1; create table t1m (a int) engine=myisam; create table t1i (a int) engine=innodb; create table t2m (a int) engine=myisam; create table t2i (a int) engine=innodb; insert into t2m values (5); insert into t2i values (5); select min(a) from t1m; min(a) NULL select min(7) from t1m; min(7) NULL select min(7) from DUAL; min(7) 7 explain select min(7) from t2m join t1m; 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(7) from t2m join t1m; min(7) NULL select max(a) from t1m; max(a) NULL select max(7) from t1m; max(7) NULL select max(7) from DUAL; max(7) 7 explain select max(7) from t2m join t1m; 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(7) from t2m join t1m; max(7) NULL select 1, min(a) from t1m where a=99; 1 min(a) 1 NULL select 1, min(a) from t1m where 1=99; 1 min(a) 1 NULL select 1, min(1) from t1m where a=99; 1 min(1) 1 NULL select 1, min(1) from t1m where 1=99; 1 min(1) 1 NULL select 1, max(a) from t1m where a=99; 1 max(a) 1 NULL select 1, max(a) from t1m where 1=99; 1 max(a) 1 NULL select 1, max(1) from t1m where a=99; 1 max(1) 1 NULL select 1, max(1) from t1m where 1=99; 1 max(1) 1 NULL select min(a) from t1i; min(a) NULL select min(7) from t1i; min(7) NULL select min(7) from DUAL; min(7) 7 explain select min(7) from t2i join t1i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2i ALL NULL NULL NULL NULL 1 1 SIMPLE t1i ALL NULL NULL NULL NULL 1 Using join buffer select min(7) from t2i join t1i; min(7) NULL select max(a) from t1i; max(a) NULL select max(7) from t1i; max(7) NULL select max(7) from DUAL; max(7) 7 explain select max(7) from t2i join t1i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2i ALL NULL NULL NULL NULL 1 1 SIMPLE t1i ALL NULL NULL NULL NULL 1 Using join buffer select max(7) from t2i join t1i; max(7) NULL select 1, min(a) from t1i where a=99; 1 min(a) 1 NULL select 1, min(a) from t1i where 1=99; 1 min(a) 1 NULL select 1, min(1) from t1i where a=99; 1 min(1) 1 NULL select 1, min(1) from t1i where 1=99; 1 min(1) 1 NULL select 1, max(a) from t1i where a=99; 1 max(a) 1 NULL select 1, max(a) from t1i where 1=99; 1 max(a) 1 NULL select 1, max(1) from t1i where a=99; 1 max(1) 1 NULL select 1, max(1) from t1i where 1=99; 1 max(1) 1 NULL explain select count(*), min(7), max(7) from t1m, t1i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1m system NULL NULL NULL NULL 0 const row not found 1 SIMPLE t1i ALL NULL NULL NULL NULL 1 select count(*), min(7), max(7) from t1m, t1i; count(*) min(7) max(7) 0 NULL NULL explain select count(*), min(7), max(7) from t1m, t2i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1m system NULL NULL NULL NULL 0 const row not found 1 SIMPLE t2i ALL NULL NULL NULL NULL 1 select count(*), min(7), max(7) from t1m, t2i; count(*) min(7) max(7) 0 NULL NULL explain select count(*), min(7), max(7) from t2m, t1i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2m system NULL NULL NULL NULL 1 1 SIMPLE t1i ALL NULL NULL NULL NULL 1 select count(*), min(7), max(7) from t2m, t1i; count(*) min(7) max(7) 0 NULL NULL drop table t1m, t1i, t2m, t2i; # # Bug#12713907: STRANGE OPTIMIZE & WRONG RESULT UNDER ORDER BY # COUNT(*) LIMIT. # CREATE TABLE t1 ( id BIGINT(20) , member_id_to INT(11) , r_date DATE , PRIMARY KEY (id,r_date), KEY r_date_idx (r_date), KEY t1_idx01 (member_id_to) ) ENGINE=InnoDB; INSERT INTO t1 VALUES (107924526,518491,'2011-05-01'), (107924527,518491,'2011-05-01'), (107924528,518491,'2011-05-01'), (107924529,518491,'2011-05-01'), (107924530,518491,'2011-05-01'), (107924531,518491,'2011-05-01'), (107924532,518491,'2011-05-01'), (107924534,518491,'2011-06-21'), (107924535,518491,'2011-06-21'), (107924536,518491,'2011-06-21'), (107924537,518491,'2011-06-21'), (107924538,518491,'2011-06-21'), (107924542,1601319,'2011-06-21'), (107924543,1601319,'2011-06-21'), (107924544,1601319,'2011-06-21'), (107924545,1601319,'2011-06-21'), (107924546,1601319,'2011-06-21'), (107924547,1601319,'2011-06-21'), (107924548,1601319,'2011-06-21'), (107924549,1601319,'2011-06-21'), (107924550,1601319,'2011-06-21'); SELECT member_id_to, COUNT(*) FROM t1 WHERE r_date = '2011-06-21' GROUP BY member_id_to ORDER BY 2 LIMIT 1; member_id_to COUNT(*) 518491 5 DROP TABLE t1; # End of test BUG#12713907