group_min_max.test

这是linux下运行的mysql软件包,可用于linux 下安装 php + mysql + apach 的网络配置

select distinct t_00.a1
from t1 t_00
where exists ( select * from t2 where a1 = t_00.a1 );

-- BUG #8532 - SELECT DISTINCT a, a causes server to crash
select distinct a1,a1 from t1;
select distinct a2,a1,a2,a1 from t1;
select distinct t1.a1,t2.a1 from t1,t2;


--
-- DISTINCT queries with GROUP-BY
--

-- plans
explain select distinct a1,a2,b from t1;
explain select distinct a1,a2,b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;
explain select distinct a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b;
explain select distinct a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b;
explain select distinct b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;

--replace_column 9 #
explain select distinct a1,a2,b from t2;
--replace_column 9 #
explain select distinct a1,a2,b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;
--replace_column 9 #
explain select distinct a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b;
--replace_column 9 #
explain select distinct a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b;
--replace_column 9 #
explain select distinct b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;

-- queries
select distinct a1,a2,b from t1;
select distinct a1,a2,b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;
select distinct a1,a2,b,c from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b;
select distinct a1,a2,b from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b;
select distinct b from t1 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;

select distinct a1,a2,b from t2;
select distinct a1,a2,b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;
select distinct a1,a2,b,c from t2 where (a2 >= 'b') and (b = 'a') and (c = 'i121') group by a1,a2,b;
select distinct a1,a2,b from t2 where (a1 > 'a') and (a2 > 'a') and (b = 'c') group by a1,a2,b;
select distinct b from t2 where (a2 >= 'b') and (b = 'a') group by a1,a2,b;


--
-- COUNT (DISTINCT cols) queries
--

explain select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a');
explain select count(distinct a1,a2,b,c) from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121');
explain select count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c');
explain select count(distinct b) from t1 where (a2 >= 'b') and (b = 'a');
explain select ord(a1) + count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a');

select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a');
select count(distinct a1,a2,b,c) from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121');
select count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a') and (b = 'c');
select count(distinct b) from t1 where (a2 >= 'b') and (b = 'a');
select ord(a1) + count(distinct a1,a2,b) from t1 where (a1 > 'a') and (a2 > 'a');

--
-- Queries with expressions in the select clause
--

explain select a1,a2,b, concat(min(c), max(c)) from t1 where a1 < 'd' group by a1,a2,b;
explain select concat(a1,min(c)),b from t1 where a1 < 'd' group by a1,a2,b;
explain select concat(a1,min(c)),b,max(c) from t1 where a1 < 'd' group by a1,a2,b;
explain select concat(a1,a2),b,min(c),max(c) from t1 where a1 < 'd' group by a1,a2,b;
explain select concat(ord(min(b)),ord(max(b))),min(b),max(b) from t1 group by a1,a2;

select a1,a2,b, concat(min(c), max(c)) from t1 where a1 < 'd' group by a1,a2,b;
select concat(a1,min(c)),b from t1 where a1 < 'd' group by a1,a2,b;
select concat(a1,min(c)),b,max(c) from t1 where a1 < 'd' group by a1,a2,b;
select concat(a1,a2),b,min(c),max(c) from t1 where a1 < 'd' group by a1,a2,b;
select concat(ord(min(b)),ord(max(b))),min(b),max(b) from t1 group by a1,a2;


--
-- Negative examples: queries that should NOT be treated as optimizable by
-- QUICK_GROUP_MIN_MAX_SELECT
--

-- select a non-indexed attribute
explain select a1,a2,b,d,min(c),max(c) from t1 group by a1,a2,b;

explain select a1,a2,b,d from t1 group by a1,a2,b;

-- predicate that references an attribute that is after the MIN/MAX argument
-- in the index
explain select a1,a2,min(b),max(b) from t1
where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (c > 'a111') group by a1,a2;

-- predicate that references a non-indexed attribute
explain select a1,a2,b,min(c),max(c) from t1
where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (d > 'xy2') group by a1,a2,b;

explain select a1,a2,b,c from t1
where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (d > 'xy2') group by a1,a2,b,c;

-- non-equality predicate for a non-group select attribute
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') or (b < 'b') group by a1;
explain select a1,a2,b from t1 where (a1 = 'b' or a1 = 'd' or a1 = 'a' or a1 = 'c') and (a2 > 'a') and (c > 'a111') group by a1,a2,b;

-- non-group field with an equality predicate that references a keypart after the
-- MIN/MAX argument
explain select a1,a2,min(b),c from t2 where (a2 = 'a') and (c = 'a111') group by a1;
select a1,a2,min(b),c from t2 where (a2 = 'a') and (c = 'a111') group by a1;

-- disjunction for a non-group select attribute
explain select a1,a2,b,max(c),min(c) from t2 where (a2 = 'a') and (b = 'b') or (b = 'a') group by a1;

-- non-range predicate for the MIN/MAX attribute
explain select a1,a2,b,min(c),max(c) from t2
where (c > 'a000') and (c <= 'd999') and (c like '_8__') group by a1,a2,b;

-- not all attributes are indexed by one index
explain select a1, a2, b, c, min(d), max(d) from t1 group by a1,a2,b,c;

-- other aggregate functions than MIN/MAX
explain select a1,a2,count(a2) from t1 group by a1,a2,b;
explain select a1,a2,count(a2) from t1 where (a1 > 'a') group by a1,a2,b;
explain select sum(ord(a1)) from t1 where (a1 > 'a') group by a1,a2,b;

#
# BUG#11044: DISTINCT or GROUP BY queries with equality predicates instead of MIN/MAX.
#

explain select a1 from t1 where a2 = 'b' group by a1;
select a1 from t1 where a2 = 'b' group by a1;

explain select distinct a1 from t1 where a2 = 'b';
select distinct a1 from t1 where a2 = 'b';

#
# Bug #12672: primary key implcitly included in every innodb index
#

--disable_warnings
create table t4 (
  pk_col int auto_increment primary key, a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(64) default ' '
) engine=innodb;
--enable_warnings
insert into t4 (a1, a2, b, c, d, dummy) select * from t1;

create index idx12672_0 on t4 (a1);
create index idx12672_1 on t4 (a1,a2,b,c);
create index idx12672_2 on t4 (a1,a2,b);
analyze table t1;

select distinct a1 from t4 where pk_col not in (1,2,3,4);

drop table t1,t2,t3,t4;

#
# Bug #6142: a problem with the empty innodb table
#

--disable_warnings
create table t1 (
  a varchar(30), b varchar(30), primary key(a), key(b)
) engine=innodb;
--enable_warnings
select distinct a from t1;
drop table t1;

#
# Bug #9798: group by with rollup
#

--disable_warnings
create table t1(a int, key(a)) engine=innodb;
--enable_warnings
insert into t1 values(1);
select a, count(a) from t1 group by a with rollup;
drop table t1;

#
# Bug #13293 Wrongly used index results in endless loop.
#
create table t1 (f1 int, f2 char(1), primary key(f1,f2)) engine=innodb;
insert into t1 values ( 1,"e"),(2,"a"),( 3,"c"),(4,"d");
alter table t1 drop primary key, add primary key (f2, f1);
explain select distinct f1 a, f1 b from t1;
explain select distinct f1, f2 from t1;
drop table t1;

#
# Bug #14920 Ordering aggregated result sets with composite primary keys
# corrupts resultset
#
create table t1 (c1 int not null,c2 int not null, primary key(c1,c2));
insert into t1 (c1,c2) values
(10,1),(10,2),(10,3),(20,4),(20,5),(20,6),(30,7),(30,8),(30,9);
select distinct c1, c2 from t1 order by c2;
select c1,min(c2) as c2 from t1 group by c1 order by c2;
select c1,c2 from t1 group by c1,c2 order by c2;
drop table t1;

#
# Bug #16203: Analysis for possible min/max optimization erroneously
#             returns impossible range
#

CREATE TABLE t1 (a varchar(5), b int(11), PRIMARY KEY (a,b));
INSERT INTO t1 VALUES ('AA',1), ('AA',2), ('AA',3), ('BB',1), ('AA',4);
OPTIMIZE TABLE t1;

SELECT a FROM t1 WHERE a='AA' GROUP BY a;
SELECT a FROM t1 WHERE a='BB' GROUP BY a;

EXPLAIN SELECT a FROM t1 WHERE a='AA' GROUP BY a;
EXPLAIN SELECT a FROM t1 WHERE a='BB' GROUP BY a;

SELECT DISTINCT a FROM t1 WHERE a='BB';
SELECT DISTINCT a FROM t1 WHERE a LIKE 'B%';
SELECT a FROM t1 WHERE a LIKE 'B%' GROUP BY a;

DROP TABLE t1;


#
# Bug #15102: select distinct returns empty result, select count 
#             distinct > 0 (correct)
#

CREATE TABLE t1 (
   a int(11) NOT NULL DEFAULT '0',
   b varchar(16) COLLATE latin1_general_ci NOT NULL DEFAULT '',
   PRIMARY KEY  (a,b)
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;

delimiter |;

CREATE PROCEDURE a(x INT)
BEGIN
  DECLARE rnd INT;
  DECLARE cnt INT;

  WHILE x > 0 DO
    SET rnd= x % 100;
    SET cnt = (SELECT COUNT(*) FROM t1 WHERE a = rnd);
    INSERT INTO t1(a,b) VALUES (rnd, CAST(cnt AS CHAR));
    SET x= x - 1;
  END WHILE;
END|

DELIMITER ;|

CALL a(1000);

SELECT a FROM t1 WHERE a=0;
SELECT DISTINCT a FROM t1 WHERE a=0;
SELECT COUNT(DISTINCT a) FROM t1 WHERE a=0;

DROP TABLE t1;
DROP PROCEDURE a;