Current File : //usr/share/mysql-test/r/distinct.result
drop table if exists t1,t2,t3;
CREATE TABLE t1 (id int,facility char(20));
CREATE TABLE t2 (facility char(20));
INSERT INTO t1 VALUES (NULL,NULL);
INSERT INTO t1 VALUES (-1,'');
INSERT INTO t1 VALUES (0,'');
INSERT INTO t1 VALUES (1,'/L');
INSERT INTO t1 VALUES (2,'A01');
INSERT INTO t1 VALUES (3,'ANC');
INSERT INTO t1 VALUES (4,'F01');
INSERT INTO t1 VALUES (5,'FBX');
INSERT INTO t1 VALUES (6,'MT');
INSERT INTO t1 VALUES (7,'P');
INSERT INTO t1 VALUES (8,'RV');
INSERT INTO t1 VALUES (9,'SRV');
INSERT INTO t1 VALUES (10,'VMT');
INSERT INTO t2 SELECT DISTINCT FACILITY FROM t1;
select id from t1 group by id;
id
NULL
-1
0
1
2
3
4
5
6
7
8
9
10
select * from t1 order by id;
id facility
NULL NULL
-1
0
1 /L
2 A01
3 ANC
4 F01
5 FBX
6 MT
7 P
8 RV
9 SRV
10 VMT
select id-5,facility from t1 order by "id-5";
id-5 facility
NULL NULL
-6
-5
-4 /L
-3 A01
-2 ANC
-1 F01
0 FBX
1 MT
2 P
3 RV
4 SRV
5 VMT
select id,concat(facility) from t1 group by id ;
id concat(facility)
NULL NULL
-1
0
1 /L
2 A01
3 ANC
4 F01
5 FBX
6 MT
7 P
8 RV
9 SRV
10 VMT
select id+0 as a,max(id),concat(facility) as b from t1 group by a order by b desc,a;
a max(id) b
10 10 VMT
9 9 SRV
8 8 RV
7 7 P
6 6 MT
5 5 FBX
4 4 F01
3 3 ANC
2 2 A01
1 1 /L
-1 -1
0 0
NULL NULL NULL
select id >= 0 and id <= 5 as grp,count(*) from t1 group by grp;
grp count(*)
NULL 1
0 6
1 6
SELECT DISTINCT FACILITY FROM t1;
FACILITY
NULL
/L
A01
ANC
F01
FBX
MT
P
RV
SRV
VMT
SELECT FACILITY FROM t2;
FACILITY
NULL
/L
A01
ANC
F01
FBX
MT
P
RV
SRV
VMT
SELECT count(*) from t1,t2 where t1.facility=t2.facility;
count(*)
12
select count(facility) from t1;
count(facility)
12
select count(*) from t1;
count(*)
13
select count(*) from t1 where facility IS NULL;
count(*)
1
select count(*) from t1 where facility = NULL;
count(*)
0
select count(*) from t1 where facility IS NOT NULL;
count(*)
12
select count(*) from t1 where id IS NULL;
count(*)
1
select count(*) from t1 where id IS NOT NULL;
count(*)
12
drop table t1,t2;
CREATE TABLE t1 (UserId int(11) DEFAULT '0' NOT NULL);
INSERT INTO t1 VALUES (20);
INSERT INTO t1 VALUES (27);
SELECT UserId FROM t1 WHERE Userid=22;
UserId
SELECT UserId FROM t1 WHERE UserId=22 group by Userid;
UserId
SELECT DISTINCT UserId FROM t1 WHERE UserId=22 group by Userid;
UserId
SELECT DISTINCT UserId FROM t1 WHERE UserId=22;
UserId
drop table t1;
CREATE TABLE t1 (a int(10) unsigned not null primary key,b int(10) unsigned);
INSERT INTO t1 VALUES (1,1),(2,1),(3,1),(4,1);
CREATE TABLE t2 (a int(10) unsigned not null, key (A));
INSERT INTO t2 VALUES (1),(2);
CREATE TABLE t3 (a int(10) unsigned, key(A), b text);
INSERT INTO t3 VALUES (1,'1'),(2,'2');
SELECT DISTINCT t3.b FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
b
1
INSERT INTO t2 values (1),(2),(3);
INSERT INTO t3 VALUES (1,'1'),(2,'2'),(1,'1'),(2,'2');
explain SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 4 Using where; Using temporary
1 SIMPLE t3 ref a a 5 test.t1.b 2 Using index
1 SIMPLE t2 index a a 4 NULL 5 Using where; Using index; Distinct; Using join buffer (Block Nested Loop)
SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
a
1
create temporary table t4 select * from t3;
insert into t3 select * from t4;
insert into t4 select * from t3;
insert into t3 select * from t4;
insert into t4 select * from t3;
insert into t3 select * from t4;
insert into t4 select * from t3;
insert into t3 select * from t4;
explain select distinct t1.a from t1,t3 where t1.a=t3.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 4 Using index; Using temporary
1 SIMPLE t3 ref a a 5 test.t1.a 11 Using index; Distinct
flush status;
select distinct t1.a from t1,t3 where t1.a=t3.a;
a
1
2
show status like 'Handler_read%';
Variable_name Value
Handler_read_first 1
Handler_read_key 4
Handler_read_last 0
Handler_read_next 4
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 3
flush status;
select distinct 1 from t1,t3 where t1.a=t3.a;
1
1
show status like 'Handler_read%';
Variable_name Value
Handler_read_first 1
Handler_read_key 4
Handler_read_last 0
Handler_read_next 208
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 1
explain SELECT distinct t1.a from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 4 Using index
explain SELECT distinct t1.a from t1 order by a desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 4 Using index
explain SELECT t1.a from t1 group by a order by a desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 4 Using index
explain SELECT distinct t1.a from t1 order by a desc limit 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 1 Using index
explain SELECT distinct a from t3 order by a desc limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 index a a 5 NULL 40 Using index
explain SELECT distinct a,b from t3 order by a+1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 ALL NULL NULL NULL NULL 204 Using temporary; Using filesort
explain SELECT distinct a,b from t3 order by a limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 index NULL a 5 NULL 2 Using temporary
explain SELECT a,b from t3 group by a,b order by a+1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 ALL NULL NULL NULL NULL 204 Using temporary; Using filesort
SELECT distinct t1.a from t1;
a
1
2
3
4
SELECT distinct t1.a from t1 order by a desc;
a
4
3
2
1
SELECT t1.a from t1 group by a order by a desc;
a
4
3
2
1
SELECT distinct t1.a from t1 order by a desc limit 1;
a
4
SELECT distinct a from t3 order by a desc limit 2;
a
2
1
SELECT distinct a,b from t3 order by a+1;
a b
1 1
2 2
SELECT distinct a,b from t3 order by a limit 2;
a b
1 1
2 2
SELECT a,b from t3 group by a,b order by a+1;
a b
1 1
2 2
drop table t1,t2,t3,t4;
CREATE TABLE t1 (name varchar(255));
INSERT INTO t1 VALUES ('aa'),('ab'),('ac'),('ad'),('ae');
SELECT DISTINCT * FROM t1 LIMIT 2;
name
aa
ab
SELECT DISTINCT name FROM t1 LIMIT 2;
name
aa
ab
SELECT DISTINCT 1 FROM t1 LIMIT 2;
1
1
drop table t1;
CREATE TABLE t1 (
ID int(11) NOT NULL auto_increment,
NAME varchar(75) DEFAULT '' NOT NULL,
LINK_ID int(11) DEFAULT '0' NOT NULL,
PRIMARY KEY (ID),
KEY NAME (NAME),
KEY LINK_ID (LINK_ID)
);
INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (1,'Mike',0),(2,'Jack',0),(3,'Bill',0);
CREATE TABLE t2 (
ID int(11) NOT NULL auto_increment,
NAME varchar(150) DEFAULT '' NOT NULL,
PRIMARY KEY (ID),
KEY NAME (NAME)
);
SELECT DISTINCT
t2.id AS key_link_id,
t2.name AS link
FROM t1
LEFT JOIN t2 ON t1.link_id=t2.id
GROUP BY t1.id
ORDER BY link;
key_link_id link
NULL NULL
drop table t1,t2;
create table t1 (
id int not null,
name tinytext not null,
unique (id)
);
create table t2 (
id int not null,
idx int not null,
unique (id, idx)
);
create table t3 (
id int not null,
idx int not null,
unique (id, idx)
);
insert into t1 values (1,'yes'), (2,'no');
insert into t2 values (1,1);
insert into t3 values (1,1);
EXPLAIN
SELECT DISTINCT
t1.id
from
t1
straight_join
t2
straight_join
t3
straight_join
t1 as j_lj_t2 left join t2 as t2_lj
on j_lj_t2.id=t2_lj.id
straight_join
t1 as j_lj_t3 left join t3 as t3_lj
on j_lj_t3.id=t3_lj.id
WHERE
((t1.id=j_lj_t2.id AND t2_lj.id IS NULL) OR (t1.id=t2.id AND t2.idx=2))
AND ((t1.id=j_lj_t3.id AND t3_lj.id IS NULL) OR (t1.id=t3.id AND t3.idx=2));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index id id 4 NULL 2 Using index; Using temporary
1 SIMPLE t2 index id id 8 NULL 1 Using index; Distinct; Using join buffer (Block Nested Loop)
1 SIMPLE t3 index id id 8 NULL 1 Using index; Distinct; Using join buffer (Block Nested Loop)
1 SIMPLE j_lj_t2 index id id 4 NULL 2 Using where; Using index; Distinct; Using join buffer (Block Nested Loop)
1 SIMPLE t2_lj index id id 8 NULL 1 Using where; Using index; Distinct; Using join buffer (Block Nested Loop)
1 SIMPLE j_lj_t3 index id id 4 NULL 2 Using where; Using index; Distinct; Using join buffer (Block Nested Loop)
1 SIMPLE t3_lj index id id 8 NULL 1 Using where; Using index; Distinct; Using join buffer (Block Nested Loop)
SELECT DISTINCT
t1.id
from
t1
straight_join
t2
straight_join
t3
straight_join
t1 as j_lj_t2 left join t2 as t2_lj
on j_lj_t2.id=t2_lj.id
straight_join
t1 as j_lj_t3 left join t3 as t3_lj
on j_lj_t3.id=t3_lj.id
WHERE
((t1.id=j_lj_t2.id AND t2_lj.id IS NULL) OR (t1.id=t2.id AND t2.idx=2))
AND ((t1.id=j_lj_t3.id AND t3_lj.id IS NULL) OR (t1.id=t3.id AND t3.idx=2));
id
2
drop table t1,t2,t3;
create table t1 (a int not null, b int not null, t time);
insert into t1 values (1,1,"00:06:15"),(1,2,"00:06:15"),(1,2,"00:30:15"),(1,3,"00:06:15"),(1,3,"00:30:15");
select a,sec_to_time(sum(time_to_sec(t))) from t1 group by a,b;
a sec_to_time(sum(time_to_sec(t)))
1 00:06:15
1 00:36:30
1 00:36:30
select distinct a,sec_to_time(sum(time_to_sec(t))) from t1 group by a,b;
a sec_to_time(sum(time_to_sec(t)))
1 00:06:15
1 00:36:30
create table t2 (a int not null primary key, b int);
insert into t2 values (1,1),(2,2),(3,3);
select t1.a,sec_to_time(sum(time_to_sec(t))) from t1 left join t2 on (t1.b=t2.a) group by t1.a,t2.b;
a sec_to_time(sum(time_to_sec(t)))
1 00:06:15
1 00:36:30
1 00:36:30
select distinct t1.a,sec_to_time(sum(time_to_sec(t))) from t1 left join t2 on (t1.b=t2.a) group by t1.a,t2.b;
a sec_to_time(sum(time_to_sec(t)))
1 00:06:15
1 00:36:30
drop table t1,t2;
create table t1 (a int not null,b char(5), c text);
insert into t1 (a) values (1),(2),(3),(4),(1),(2),(3),(4);
select distinct a from t1 group by b,a having a > 2 order by a desc;
a
4
3
select distinct a,c from t1 group by b,c,a having a > 2 order by a desc;
a c
4 NULL
3 NULL
drop table t1;
create table t1 (a char(1), key(a)) engine=myisam;
insert into t1 values('1'),('1');
select * from t1 where a >= '1';
a
1
1
select distinct a from t1 order by a desc;
a
1
select distinct a from t1 where a >= '1' order by a desc;
a
1
drop table t1;
CREATE TABLE t1 (email varchar(50), infoID BIGINT, dateentered DATETIME);
CREATE TABLE t2 (infoID BIGINT, shipcode varchar(10));
INSERT INTO t1 (email, infoID, dateentered) VALUES
('test1@testdomain.com', 1, '2002-07-30 22:56:38'),
('test1@testdomain.com', 1, '2002-07-27 22:58:16'),
('test2@testdomain.com', 1, '2002-06-19 15:22:19'),
('test2@testdomain.com', 2, '2002-06-18 14:23:47'),
('test3@testdomain.com', 1, '2002-05-19 22:17:32');
INSERT INTO t2(infoID, shipcode) VALUES
(1, 'Z001'),
(2, 'R002');
SELECT DISTINCTROW email, shipcode FROM t1, t2 WHERE t1.infoID=t2.infoID;
email shipcode
test1@testdomain.com Z001
test2@testdomain.com Z001
test2@testdomain.com R002
test3@testdomain.com Z001
SELECT DISTINCTROW email FROM t1 ORDER BY dateentered DESC;
email
test1@testdomain.com
test2@testdomain.com
test3@testdomain.com
SELECT DISTINCTROW email, shipcode FROM t1, t2 WHERE t1.infoID=t2.infoID ORDER BY dateentered DESC;
email shipcode
test1@testdomain.com Z001
test2@testdomain.com Z001
test2@testdomain.com R002
test3@testdomain.com Z001
drop table t1,t2;
CREATE TABLE t1 (privatemessageid int(10) unsigned NOT NULL auto_increment, folderid smallint(6) NOT NULL default '0', userid int(10) unsigned NOT NULL default '0', touserid int(10) unsigned NOT NULL default '0', fromuserid int(10) unsigned NOT NULL default '0', title varchar(250) NOT NULL default '', message mediumtext NOT NULL, dateline int(10) unsigned NOT NULL default '0', showsignature smallint(6) NOT NULL default '0', iconid smallint(5) unsigned NOT NULL default '0', messageread smallint(6) NOT NULL default '0', readtime int(10) unsigned NOT NULL default '0', receipt smallint(6) unsigned NOT NULL default '0', deleteprompt smallint(6) unsigned NOT NULL default '0', multiplerecipients smallint(6) unsigned NOT NULL default '0', PRIMARY KEY (privatemessageid), KEY userid (userid)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (128,0,33,33,8,':D','',996121863,1,0,2,996122850,2,0,0);
CREATE TABLE t2 (userid int(10) unsigned NOT NULL auto_increment, usergroupid smallint(5) unsigned NOT NULL default '0', username varchar(50) NOT NULL default '', password varchar(50) NOT NULL default '', email varchar(50) NOT NULL default '', styleid smallint(5) unsigned NOT NULL default '0', parentemail varchar(50) NOT NULL default '', coppauser smallint(6) NOT NULL default '0', homepage varchar(100) NOT NULL default '', icq varchar(20) NOT NULL default '', aim varchar(20) NOT NULL default '', yahoo varchar(20) NOT NULL default '', signature mediumtext NOT NULL, adminemail smallint(6) NOT NULL default '0', showemail smallint(6) NOT NULL default '0', invisible smallint(6) NOT NULL default '0', usertitle varchar(250) NOT NULL default '', customtitle smallint(6) NOT NULL default '0', joindate int(10) unsigned NOT NULL default '0', cookieuser smallint(6) NOT NULL default '0', daysprune smallint(6) NOT NULL default '0', lastvisit int(10) unsigned NOT NULL default '0', lastactivity int(10) unsigned NOT NULL default '0', lastpost int(10) unsigned NOT NULL default '0', posts smallint(5) unsigned NOT NULL default '0', timezoneoffset varchar(4) NOT NULL default '', emailnotification smallint(6) NOT NULL default '0', buddylist mediumtext NOT NULL, ignorelist mediumtext NOT NULL, pmfolders mediumtext NOT NULL, receivepm smallint(6) NOT NULL default '0', emailonpm smallint(6) NOT NULL default '0', pmpopup smallint(6) NOT NULL default '0', avatarid smallint(6) NOT NULL default '0', avatarrevision int(6) unsigned NOT NULL default '0', options smallint(6) NOT NULL default '15', birthday date NOT NULL default '0000-00-00', maxposts smallint(6) NOT NULL default '-1', startofweek smallint(6) NOT NULL default '1', ipaddress varchar(20) NOT NULL default '', referrerid int(10) unsigned NOT NULL default '0', nosessionhash smallint(6) NOT NULL default '0', autorefresh smallint(6) NOT NULL default '-1', messagepopup tinyint(2) NOT NULL default '0', inforum smallint(5) unsigned NOT NULL default '0', ratenum smallint(5) unsigned NOT NULL default '0', ratetotal smallint(5) unsigned NOT NULL default '0', allowrate smallint(5) unsigned NOT NULL default '1', PRIMARY KEY (userid), KEY usergroupid (usergroupid), KEY username (username), KEY inforum (inforum)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (33,6,'Kevin','0','kevin@stileproject.com',1,'',0,'http://www.stileproject.com','','','','',1,1,0,'Administrator',0,996120694,1,-1,1030996168,1031027028,1030599436,36,'-6',0,'','','',1,0,1,0,0,15,'0000-00-00',-1,1,'64.0.0.0',0,1,-1,0,0,4,19,1);
SELECT DISTINCT t1.*, t2.* FROM t1 LEFT JOIN t2 ON (t2.userid = t1.touserid);
privatemessageid folderid userid touserid fromuserid title message dateline showsignature iconid messageread readtime receipt deleteprompt multiplerecipients userid usergroupid username password email styleid parentemail coppauser homepage icq aim yahoo signature adminemail showemail invisible usertitle customtitle joindate cookieuser daysprune lastvisit lastactivity lastpost posts timezoneoffset emailnotification buddylist ignorelist pmfolders receivepm emailonpm pmpopup avatarid avatarrevision options birthday maxposts startofweek ipaddress referrerid nosessionhash autorefresh messagepopup inforum ratenum ratetotal allowrate
128 0 33 33 8 :D 996121863 1 0 2 996122850 2 0 0 33 6 Kevin 0 kevin@stileproject.com 1 0 http://www.stileproject.com 1 1 0 Administrator 0 996120694 1 -1 1030996168 1031027028 1030599436 36 -6 0 1 0 1 0 0 15 0000-00-00 -1 1 64.0.0.0 0 1 -1 0 0 4 19 1
DROP TABLE t1,t2;
CREATE TABLE t1 (a int primary key, b int, c int);
INSERT t1 VALUES (1,2,3);
CREATE TABLE t2 (a int primary key, b int, c int);
INSERT t2 VALUES (3,4,5);
SELECT DISTINCT t1.a, t2.b FROM t1, t2 WHERE t1.a=1 ORDER BY t2.c;
a b
1 4
DROP TABLE t1,t2;
CREATE table t1 ( `id` int(11) NOT NULL auto_increment, `name` varchar(50) NOT NULL default '', PRIMARY KEY (`id`)) ENGINE=MyISAM AUTO_INCREMENT=3 ;
INSERT INTO t1 VALUES (1, 'aaaaa');
INSERT INTO t1 VALUES (3, 'aaaaa');
INSERT INTO t1 VALUES (2, 'eeeeeee');
select distinct left(name,1) as name from t1;
name
a
e
drop table t1;
CREATE TABLE t1 (
ID int(11) NOT NULL auto_increment,
NAME varchar(75) DEFAULT '' NOT NULL,
LINK_ID int(11) DEFAULT '0' NOT NULL,
PRIMARY KEY (ID),
KEY NAME (NAME),
KEY LINK_ID (LINK_ID)
);
INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (1,'Mike',0);
INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (2,'Jack',0);
INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (3,'Bill',0);
CREATE TABLE t2 (
ID int(11) NOT NULL auto_increment,
NAME varchar(150) DEFAULT '' NOT NULL,
PRIMARY KEY (ID),
KEY NAME (NAME)
);
SELECT DISTINCT
t2.id AS key_link_id,
t2.name AS link
FROM t1
LEFT JOIN t2 ON t1.link_id=t2.id
GROUP BY t1.id
ORDER BY link;
key_link_id link
NULL NULL
drop table t1,t2;
CREATE TABLE t1 (
html varchar(5) default NULL,
rin int(11) default '0',
rout int(11) default '0'
) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('1',1,0);
SELECT DISTINCT html,SUM(rout)/(SUM(rin)+1) as 'prod' FROM t1 GROUP BY rin;
html prod
1 0.0000
drop table t1;
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
SELECT DISTINCT a, 1 FROM t1;
a 1
1 1
2 1
3 1
4 1
5 1
SELECT DISTINCT 1, a FROM t1;
1 a
1 1
1 2
1 3
1 4
1 5
CREATE TABLE t2 (a int, b int);
INSERT INTO t2 VALUES (1,1),(2,2),(2,3),(2,4),(3,5);
SELECT DISTINCT a, b, 2 FROM t2;
a b 2
1 1 2
2 2 2
2 3 2
2 4 2
3 5 2
SELECT DISTINCT 2, a, b FROM t2;
2 a b
2 1 1
2 2 2
2 2 3
2 2 4
2 3 5
SELECT DISTINCT a, 2, b FROM t2;
a 2 b
1 2 1
2 2 2
2 2 3
2 2 4
3 2 5
DROP TABLE t1,t2;
CREATE TABLE t1(a INT PRIMARY KEY, b INT);
INSERT INTO t1 VALUES (1,1), (2,1), (3,1);
EXPLAIN SELECT DISTINCT a FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 3 Using index
EXPLAIN SELECT DISTINCT a,b FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 NULL
EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1_1 ALL NULL NULL NULL NULL 3 Using temporary
1 SIMPLE t1_2 index NULL PRIMARY 4 NULL 3 Using index; Distinct; Using join buffer (Block Nested Loop)
EXPLAIN SELECT DISTINCT t1_1.a, t1_1.b FROM t1 t1_1, t1 t1_2
WHERE t1_1.a = t1_2.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1_1 ALL PRIMARY NULL NULL NULL 3 Using temporary
1 SIMPLE t1_2 eq_ref PRIMARY PRIMARY 4 test.t1_1.a 1 Using index; Distinct
EXPLAIN SELECT a FROM t1 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 3 Using index
EXPLAIN SELECT a,b FROM t1 GROUP BY a,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using filesort
EXPLAIN SELECT DISTINCT a,b FROM t1 GROUP BY a,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using filesort
CREATE TABLE t2(a INT, b INT NOT NULL, c INT NOT NULL, d INT,
PRIMARY KEY (a,b));
INSERT INTO t2 VALUES (1,1,1,50), (1,2,3,40), (2,1,3,4);
EXPLAIN SELECT DISTINCT a FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index PRIMARY PRIMARY 8 NULL 3 Using index
EXPLAIN SELECT DISTINCT a,a FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index PRIMARY PRIMARY 8 NULL 3 Using index
EXPLAIN SELECT DISTINCT b,a FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index PRIMARY PRIMARY 8 NULL 3 Using index
EXPLAIN SELECT DISTINCT a,c FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using temporary
EXPLAIN SELECT DISTINCT c,a,b FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 NULL
EXPLAIN SELECT DISTINCT a,b,d FROM t2 GROUP BY c,b,d;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using temporary; Using filesort
CREATE UNIQUE INDEX c_b_unq ON t2 (c,b);
EXPLAIN SELECT DISTINCT a,b,d FROM t2 GROUP BY c,b,d;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using filesort
DROP TABLE t1,t2;
create table t1 (id int, dsc varchar(50));
insert into t1 values (1, "line number one"), (2, "line number two"), (3, "line number three");
select distinct id, IFNULL(dsc, '-') from t1;
id IFNULL(dsc, '-')
1 line number one
2 line number two
3 line number three
drop table t1;
CREATE TABLE t1 (a int primary key, b int);
INSERT INTO t1 (a,b) values (1,1), (2,3), (3,2);
explain SELECT DISTINCT a, b FROM t1 ORDER BY b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using filesort
SELECT DISTINCT a, b FROM t1 ORDER BY b;
a b
1 1
3 2
2 3
DROP TABLE t1;
CREATE TABLE t1 (
ID int(11) NOT NULL auto_increment,
x varchar(20) default NULL,
y decimal(10,0) default NULL,
PRIMARY KEY (ID),
KEY (y)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES
(1,'ba','-1'),
(2,'ba','1150'),
(306,'ba','-1'),
(307,'ba','1150'),
(611,'ba','-1'),
(612,'ba','1150');
select count(distinct x,y) from t1;
count(distinct x,y)
2
select count(distinct concat(x,y)) from t1;
count(distinct concat(x,y))
2
drop table t1;
CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a,b));
INSERT INTO t1 VALUES (1, 101);
INSERT INTO t1 SELECT a + 1, a + 101 FROM t1;
INSERT INTO t1 SELECT a + 2, a + 102 FROM t1;
INSERT INTO t1 SELECT a + 4, a + 104 FROM t1;
INSERT INTO t1 SELECT a + 8, a + 108 FROM t1;
EXPLAIN SELECT DISTINCT a,a FROM t1 WHERE b < 12 ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 16 Using where; Using index
SELECT DISTINCT a,a FROM t1 WHERE b < 12 ORDER BY a;
a a
DROP TABLE t1;
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (id INT NOT NULL, fruit_id INT NOT NULL, fruit_name varchar(20)
default NULL);
INSERT INTO t1 VALUES (1,1,'ORANGE');
INSERT INTO t1 VALUES (2,2,'APPLE');
INSERT INTO t1 VALUES (3,2,'APPLE');
INSERT INTO t1 VALUES (4,3,'PEAR');
SELECT DISTINCT fruit_id, fruit_name INTO @v1, @v2 FROM t1 WHERE fruit_name =
'APPLE';
SELECT @v1, @v2;
@v1 @v2
2 APPLE
SELECT DISTINCT fruit_id, fruit_name INTO @v3, @v4 FROM t1 GROUP BY fruit_id,
fruit_name HAVING fruit_name = 'APPLE';
SELECT @v3, @v4;
@v3 @v4
2 APPLE
SELECT DISTINCT @v5:= fruit_id, @v6:= fruit_name INTO @v7, @v8 FROM t1 WHERE
fruit_name = 'APPLE';
SELECT @v5, @v6, @v7, @v8;
@v5 @v6 @v7 @v8
2 APPLE 2 APPLE
SELECT DISTINCT @v5 + fruit_id, CONCAT(@v6, fruit_name) INTO @v9, @v10 FROM t1
WHERE fruit_name = 'APPLE';
SELECT @v5, @v6, @v7, @v8, @v9, @v10;
@v5 @v6 @v7 @v8 @v9 @v10
2 APPLE 2 APPLE 4 APPLEAPPLE
SELECT DISTINCT @v11:= @v5 + fruit_id, @v12:= CONCAT(@v6, fruit_name) INTO
@v13, @v14 FROM t1 WHERE fruit_name = 'APPLE';
SELECT @v11, @v12, @v13, @v14;
@v11 @v12 @v13 @v14
4 APPLEAPPLE 4 APPLEAPPLE
SELECT DISTINCT @v13, @v14 INTO @v15, @v16 FROM t1 WHERE fruit_name = 'APPLE';
SELECT @v15, @v16;
@v15 @v16
4 APPLEAPPLE
SELECT DISTINCT 2 + 2, 'Bob' INTO @v17, @v18 FROM t1 WHERE fruit_name =
'APPLE';
SELECT @v17, @v18;
@v17 @v18
4 Bob
DROP TABLE IF EXISTS t2;
CREATE TABLE t2 (fruit_id INT NOT NULL, fruit_name varchar(20)
default NULL);
SELECT DISTINCT fruit_id, fruit_name INTO OUTFILE
'../../tmp/data1.tmp' FROM t1 WHERE fruit_name = 'APPLE';
LOAD DATA INFILE '../../tmp/data1.tmp' INTO TABLE t2;
SELECT DISTINCT @v19:= fruit_id, @v20:= fruit_name INTO OUTFILE
'../../tmp/data2.tmp' FROM t1 WHERE fruit_name = 'APPLE';
LOAD DATA INFILE '../../tmp/data2.tmp' INTO TABLE t2;
SELECT @v19, @v20;
@v19 @v20
2 APPLE
SELECT * FROM t2;
fruit_id fruit_name
2 APPLE
2 APPLE
DROP TABLE t1;
DROP TABLE t2;
CREATE TABLE t1 (a CHAR(1));
INSERT INTO t1 VALUES('A'), (0);
SELECT a FROM t1 WHERE a=0;
a
A
0
Warnings:
Warning 1292 Truncated incorrect DOUBLE value: 'A'
SELECT DISTINCT a FROM t1 WHERE a=0;
a
A
0
Warnings:
Warning 1292 Truncated incorrect DOUBLE value: 'A'
DROP TABLE t1;
CREATE TABLE t1 (a DATE);
INSERT INTO t1 VALUES ('1972-07-29'), ('1972-02-06');
EXPLAIN SELECT (SELECT DISTINCT a FROM t1 WHERE a = '2002-08-03');
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
EXPLAIN SELECT (SELECT DISTINCT ADDDATE(a,1) FROM t1
WHERE ADDDATE(a,1) = '2002-08-03');
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 Using where
CREATE TABLE t2 (a CHAR(5) CHARACTER SET latin1 COLLATE latin1_general_ci);
INSERT INTO t2 VALUES (0xf6);
INSERT INTO t2 VALUES ('oe');
SELECT COUNT(*) FROM (SELECT DISTINCT a FROM t2) dt;
COUNT(*)
2
SELECT COUNT(*) FROM
(SELECT DISTINCT a FROM t2 WHERE a='oe' COLLATE latin1_german2_ci) dt;
COUNT(*)
2
DROP TABLE t1, t2;
CREATE TABLE t1 (a INT, UNIQUE (a));
INSERT INTO t1 VALUES (4),(null),(2),(1),(null),(3);
EXPLAIN SELECT DISTINCT a FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index a a 5 NULL 6 Using index
SELECT DISTINCT a FROM t1;
a
NULL
1
2
3
4
EXPLAIN SELECT a FROM t1 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index a a 5 NULL 6 Using index
SELECT a FROM t1 GROUP BY a;
a
NULL
1
2
3
4
DROP TABLE t1;
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES(1,1),(1,2),(1,3);
SELECT DISTINCT a, b FROM t1;
a b
1 1
1 2
1 3
SELECT DISTINCT a, a, b FROM t1;
a a b
1 1 1
1 1 2
1 1 3
DROP TABLE t1;
End of 5.0 tests
CREATE TABLE t1(a INT, b INT, c INT, d INT, e INT,
PRIMARY KEY(a,b,c,d,e),
KEY(a,b,d,c)
);
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);
EXPLAIN SELECT DISTINCT a, b, d, c FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY,a a 16 NULL 6 Using index
SELECT DISTINCT a, b, d, c FROM t1;
a b d c
1 1 0 1
1 1 0 2
1 1 0 3
1 2 0 1
1 2 0 2
1 2 0 3
DROP TABLE t1;
#
# Bug #46159: simple query that never returns
#
SET @old_max_heap_table_size = @@max_heap_table_size;
SET @@max_heap_table_size = 16384;
SET @old_sort_buffer_size = @@sort_buffer_size;
SET @@sort_buffer_size = 32804;
CREATE TABLE t1(c1 int, c2 VARCHAR(20));
INSERT INTO t1 VALUES (1, '1'), (1, '1'), (2, '2'), (3, '1'), (3, '1'), (4, '4');
INSERT INTO t1 SELECT 5 + 10000 * RAND(), '5' FROM t1;
INSERT INTO t1 SELECT 5 + 10000 * RAND(), '5' FROM t1;
INSERT INTO t1 SELECT 5 + 10000 * RAND(), '5' FROM t1;
INSERT INTO t1 SELECT 5 + 10000 * RAND(), '5' FROM t1;
INSERT INTO t1 SELECT 5 + 10000 * RAND(), '5' FROM t1;
INSERT INTO t1 SELECT 5 + 10000 * RAND(), '5' FROM t1;
INSERT INTO t1 SELECT 5 + 10000 * RAND(), '5' FROM t1;
INSERT INTO t1 SELECT 5 + 10000 * RAND(), '5' FROM t1;
SELECT c1, c2, COUNT(*) FROM t1 GROUP BY c1 LIMIT 4;
c1 c2 COUNT(*)
1 1 2
2 2 1
3 1 2
4 4 1
SELECT DISTINCT c2 FROM t1 GROUP BY c1 HAVING COUNT(*) > 1;
c2
1
5
DROP TABLE t1;
SET @@sort_buffer_size = @old_sort_buffer_size;
SET @@max_heap_table_size = @old_max_heap_table_size;
End of 5.1 tests
#
# Bug #11744875: 4082: integer lengths cause truncation with distinct concat and innodb
#
CREATE TABLE t1 (a INT(1), b INT(1));
INSERT INTO t1 VALUES (1111, 2222), (3333, 4444);
SELECT DISTINCT CONCAT(a,b) AS c FROM t1 ORDER BY 1;
c
11112222
33334444
DROP TABLE t1;
#
# Bug#16539979 BASIC SELECT COUNT(DISTINCT ID) IS BROKEN.
# Bug#17867117 ERROR RESULT WHEN "COUNT + DISTINCT + CASE WHEN" NEED MERGE_WALK
#
SET @tmp_table_size_save= @@tmp_table_size;
SET @@tmp_table_size= 1024;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2),(3),(4),(5),(6),(7),(8);
INSERT INTO t1 SELECT a+8 FROM t1;
INSERT INTO t1 SELECT a+16 FROM t1;
INSERT INTO t1 SELECT a+32 FROM t1;
INSERT INTO t1 SELECT a+64 FROM t1;
INSERT INTO t1 VALUE(NULL);
SELECT COUNT(DISTINCT a) FROM t1;
COUNT(DISTINCT a)
128
SELECT COUNT(DISTINCT (a+0)) FROM t1;
COUNT(DISTINCT (a+0))
128
DROP TABLE t1;
create table tb(
id int auto_increment primary key,
v varchar(32))
engine=myisam charset=gbk;
insert into tb(v) values("aaa");
insert into tb(v) (select v from tb);
insert into tb(v) (select v from tb);
insert into tb(v) (select v from tb);
insert into tb(v) (select v from tb);
insert into tb(v) (select v from tb);
insert into tb(v) (select v from tb);
update tb set v=concat(v, id);
select count(distinct case when id<=64 then id end) from tb;
count(distinct case when id<=64 then id end)
64
select count(distinct case when id<=63 then id end) from tb;
count(distinct case when id<=63 then id end)
63
drop table tb;
SET @@tmp_table_size= @tmp_table_size_save;
End of 5.5 tests
#
# Bug#13335170 - ASSERT IN
# PLAN_CHANGE_WATCHDOG::~PLAN_CHANGE_WATCHDOG() ON SELECT DISTINCT
#
CREATE TABLE t1 (
col_int_key int(11) NOT NULL,
col_time_key time NOT NULL,
col_datetime_key datetime NOT NULL,
KEY col_int_key (col_int_key),
KEY col_time_key (col_time_key),
KEY col_datetime_key (col_datetime_key)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES (7,'06:17:39','2003-08-21 00:00:00');
SELECT DISTINCT col_int_key
FROM t1
WHERE col_int_key IN ( 18, 6, 84, 4, 0, 2, 8, 3, 7, 9, 1 )
AND col_datetime_key BETWEEN '2001-08-04' AND '2003-06-13'
ORDER BY col_time_key
LIMIT 3;
col_int_key
DROP TABLE t1;
#
# BUG#13540692: WRONG NULL HANDLING WITH RIGHT JOIN +
# DISTINCT OR ORDER BY
#
CREATE TABLE t1 (
a INT,
b INT NOT NULL
);
INSERT INTO t1 VALUES (1,2), (3,3);
EXPLAIN SELECT DISTINCT subselect.b
FROM t1 LEFT JOIN
(SELECT it_b.* FROM t1 as it_a LEFT JOIN t1 as it_b ON true) AS subselect
ON t1.a = subselect.b
;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using temporary
1 PRIMARY <derived2> ref <auto_key0> <auto_key0> 5 test.t1.a 2 NULL
2 DERIVED it_a ALL NULL NULL NULL NULL 2 NULL
2 DERIVED it_b ALL NULL NULL NULL NULL 2 Using where; Using join buffer (Block Nested Loop)
SELECT DISTINCT subselect.b
FROM t1 LEFT JOIN
(SELECT it_b.* FROM t1 as it_a LEFT JOIN t1 as it_b ON true) AS subselect
ON t1.a = subselect.b
;
b
NULL
3
DROP TABLE t1;
#
# BUG#13538387: WRONG RESULT ON SELECT DISTINCT + LEFT JOIN +
# LIMIT + MIX OF MYISAM AND INNODB
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (2),(3);
CREATE TABLE t2 (b INT);
CREATE TABLE t3 (
a INT,
b INT,
PRIMARY KEY (b)
);
INSERT INTO t3 VALUES (2001,1), (2007,2);
EXPLAIN SELECT DISTINCT t3.a AS t3_date
FROM t1
LEFT JOIN t2 ON false
LEFT JOIN t3 ON t2.b = t3.b
LIMIT 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 system NULL NULL NULL NULL 0 const row not found
1 SIMPLE t3 const PRIMARY NULL NULL NULL 1 Using temporary
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Distinct
SELECT DISTINCT t3.a AS t3_date
FROM t1
LEFT JOIN t2 ON false
LEFT JOIN t3 ON t2.b = t3.b
LIMIT 1;
t3_date
NULL
DROP TABLE t1,t2,t3;
#
# Bug#22686994 REGRESSION FOR A GROUPING QUERY WITH DISTINCT
#
CREATE TABLE t1 (a INTEGER, b INTEGER);
INSERT INTO t1 VALUES (1,3), (2,4), (1,5),
(1,3), (2,1), (1,5), (1,7), (3,1),
(3,2), (3,1), (2,4);
SELECT DISTINCT (COUNT(DISTINCT b) + 1) AS c FROM t1 GROUP BY a;
c
4
3
DROP TABLE t1;
# End of test for Bug#22686994
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