drop table if exists t1,t2,t3;
CREATE TABLE t1 (
id int(6) DEFAULT '0' NOT NULL,
idservice int(5),
clee char(20) NOT NULL,
flag char(1),
KEY id (id),
PRIMARY KEY (clee)
);
INSERT INTO t1 VALUES (2,4,'6067169d','Y');
INSERT INTO t1 VALUES (2,5,'606716d1','Y');
INSERT INTO t1 VALUES (2,1,'606717c1','Y');
INSERT INTO t1 VALUES (3,1,'6067178d','Y');
INSERT INTO t1 VALUES (2,6,'60671515','Y');
INSERT INTO t1 VALUES (2,7,'60671569','Y');
INSERT INTO t1 VALUES (2,3,'dd','Y');
CREATE TABLE t2 (
id int(6) NOT NULL auto_increment,
description varchar(40) NOT NULL,
idform varchar(40),
ordre int(6) unsigned DEFAULT '0' NOT NULL,
image varchar(60),
PRIMARY KEY (id),
KEY id (id,ordre)
);
INSERT INTO t2 VALUES (1,'Emettre un appel d''offres','en_construction.html',10,'emettre.gif');
INSERT INTO t2 VALUES (2,'Emettre des soumissions','en_construction.html',20,'emettre.gif');
INSERT INTO t2 VALUES (7,'Liste des t2','t2_liste_form.phtml',51060,'link.gif');
INSERT INTO t2 VALUES (8,'Consulter les soumissions','consulter_soumissions.phtml',200,'link.gif');
INSERT INTO t2 VALUES (9,'Ajouter un type de materiel','typeMateriel_ajoute_form.phtml',51000,'link.gif');
INSERT INTO t2 VALUES (10,'Lister/modifier un type de materiel','typeMateriel_liste_form.phtml',51010,'link.gif');
INSERT INTO t2 VALUES (3,'Créer une fiche de client','clients_ajoute_form.phtml',40000,'link.gif');
INSERT INTO t2 VALUES (4,'Modifier des clients','en_construction.html',40010,'link.gif');
INSERT INTO t2 VALUES (5,'Effacer des clients','en_construction.html',40020,'link.gif');
INSERT INTO t2 VALUES (6,'Ajouter un service','t2_ajoute_form.phtml',51050,'link.gif');
select t1.id,t1.idservice,t2.ordre,t2.description  from t1, t2 where t1.id = 2   and t1.idservice = t2.id  order by t2.ordre;
id	idservice	ordre	description
2	1	10	Emettre un appel d'offres
2	3	40000	Créer une fiche de client
2	4	40010	Modifier des clients
2	5	40020	Effacer des clients
2	6	51050	Ajouter un service
2	7	51060	Liste des t2
drop table t1,t2;
create table t1 (first char(10),last char(10));
insert into t1 values ("Michael","Widenius");
insert into t1 values ("Allan","Larsson");
insert into t1 values ("David","Axmark");
select concat(first," ",last) as name from t1 order by name;
name
Allan Larsson
David Axmark
Michael Widenius
select concat(last," ",first) as name from t1 order by name;
name
Axmark David
Larsson Allan
Widenius Michael
drop table t1;
create table t1 (i int);
insert into t1 values(1),(2),(1),(2),(1),(2),(3);
select distinct i from t1;
i
1
2
3
select distinct i from t1 order by rand(5);
i
1
3
2
select distinct i from t1 order by i desc;
i
3
2
1
select distinct i from t1 order by 1-i;
i
3
2
1
select distinct i from t1 order by mod(i,2),i;
i
2
1
3
drop table t1;
create table t1 ( pk     int primary key, name   varchar(255) not null, number varchar(255) not null);
insert into t1 values (1, 'Gamma',     '123'), (2, 'Gamma Ext', '123a'), (3, 'Alpha',     '001'), (4, 'Beta',      '200c');
select distinct t1.name as 'Building Name',t1.number as 'Building Number' from t1 order by t1.name asc;
Building Name	Building Number
Alpha	001
Beta	200c
Gamma	123
Gamma Ext	123a
drop table t1;
create table t1 (id int not null,col1 int not null,col2 int not null,index(col1));
insert into t1 values(1,2,2),(2,2,1),(3,1,2),(4,1,1),(5,1,4),(6,2,3),(7,3,1),(8,2,4);
select * from t1 order by col1,col2;
id	col1	col2
4	1	1
3	1	2
5	1	4
2	2	1
1	2	2
6	2	3
8	2	4
7	3	1
select col1 from t1 order by id;
col1
2
2
1
1
1
2
3
2
select col1 as id from t1 order by id;
id
1
1
1
2
2
2
2
3
select concat(col1) as id from t1 order by id;
id
1
1
1
2
2
2
2
3
drop table t1;
CREATE TABLE t1 (id int auto_increment primary key,aika varchar(40),aikakentta  timestamp);
insert into t1 (aika) values ('Keskiviikko');
insert into t1 (aika) values ('Tiistai');
insert into t1 (aika) values ('Maanantai');
insert into t1 (aika) values ('Sunnuntai');
SELECT FIELD(SUBSTRING(t1.aika,1,2),'Ma','Ti','Ke','To','Pe','La','Su') AS test FROM t1 ORDER by test;
test
1
2
3
7
drop table t1;
CREATE TABLE t1
(
a          int unsigned       NOT NULL,
b          int unsigned       NOT NULL,
c          int unsigned       NOT NULL,
UNIQUE(a),
INDEX(b),
INDEX(c)
);
CREATE TABLE t2
(
c          int unsigned       NOT NULL,
i          int unsigned       NOT NULL,
INDEX(c)
);
CREATE TABLE t3
(
c          int unsigned       NOT NULL,
v          varchar(64),
INDEX(c)
);
INSERT INTO t1 VALUES (1,1,1);
INSERT INTO t1 VALUES (2,1,2);
INSERT INTO t1 VALUES (3,2,1);
INSERT INTO t1 VALUES (4,2,2);
INSERT INTO t2 VALUES (1,50);
INSERT INTO t2 VALUES (2,25);
INSERT INTO t3 VALUES (1,'123 Park Place');
INSERT INTO t3 VALUES (2,'453 Boardwalk');
SELECT    a,b,if(b = 1,i,if(b = 2,v,''))
FROM      t1
LEFT JOIN t2 USING(c)
LEFT JOIN t3 ON t3.c = t1.c;
a	b	if(b = 1,i,if(b = 2,v,''))
1	1	50
2	1	25
3	2	123 Park Place
4	2	453 Boardwalk
SELECT    a,b,if(b = 1,i,if(b = 2,v,''))
FROM      t1
LEFT JOIN t2 ON t1.c = t2.c
LEFT JOIN t3 ON t3.c = t1.c;
a	b	if(b = 1,i,if(b = 2,v,''))
1	1	50
2	1	25
3	2	123 Park Place
4	2	453 Boardwalk
SELECT    a,b,if(b = 1,i,if(b = 2,v,''))
FROM      t1
LEFT JOIN t2 USING(c)
LEFT JOIN t3 ON t3.c = t1.c
ORDER BY a;
a	b	if(b = 1,i,if(b = 2,v,''))
1	1	50
2	1	25
3	2	123 Park Place
4	2	453 Boardwalk
SELECT    a,b,if(b = 1,i,if(b = 2,v,''))
FROM      t1
LEFT JOIN t2 ON t1.c = t2.c
LEFT JOIN t3 ON t3.c = t1.c
ORDER BY a;
a	b	if(b = 1,i,if(b = 2,v,''))
1	1	50
2	1	25
3	2	123 Park Place
4	2	453 Boardwalk
drop table t1,t2,t3;
create table t1 (ID int not null primary key, TransactionID int not null);
insert into t1 (ID, TransactionID) values  (1,  87), (2,  89), (3,  92), (4,  94), (5,  486), (6,  490), (7,  753), (9,  828), (10, 832), (11, 834), (12, 840);
create table t2 (ID int not null primary key, GroupID int not null);
insert into t2 (ID, GroupID) values (87,  87), (89,  89), (92,  92), (94,  94), (486, 486), (490, 490),(753, 753), (828, 828), (832, 832), (834, 834), (840, 840);
create table t3 (ID int not null primary key, DateOfAction date not null);
insert into t3 (ID, DateOfAction) values  (87,  '1999-07-19'), (89,  '1999-07-19'), (92,  '1999-07-19'), (94,  '1999-07-19'), (486, '1999-07-18'), (490, '2000-03-27'), (753, '2000-03-28'), (828, '1999-07-27'), (832, '1999-07-27'),(834, '1999-07-27'), (840, '1999-07-27');
select t3.DateOfAction, t1.TransactionID from t1 join t2 join t3 where t2.ID = t1.TransactionID and t3.ID = t2.GroupID order by t3.DateOfAction, t1.TransactionID;
DateOfAction	TransactionID
1999-07-18	486
1999-07-19	87
1999-07-19	89
1999-07-19	92
1999-07-19	94
1999-07-27	828
1999-07-27	832
1999-07-27	834
1999-07-27	840
2000-03-27	490
2000-03-28	753
select t3.DateOfAction, t1.TransactionID from t1 join t2 join t3 where t2.ID = t1.TransactionID and t3.ID = t2.GroupID order by t1.TransactionID,t3.DateOfAction;
DateOfAction	TransactionID
1999-07-19	87
1999-07-19	89
1999-07-19	92
1999-07-19	94
1999-07-18	486
2000-03-27	490
2000-03-28	753
1999-07-27	828
1999-07-27	832
1999-07-27	834
1999-07-27	840
drop table t1,t2,t3;
CREATE TABLE t1 (
member_id int(11) NOT NULL auto_increment,
inschrijf_datum varchar(20) NOT NULL default '',
lastchange_datum varchar(20) NOT NULL default '',
nickname varchar(20) NOT NULL default '',
password varchar(8) NOT NULL default '',
voornaam varchar(30) NOT NULL default '',
tussenvoegsels varchar(10) NOT NULL default '',
achternaam varchar(50) NOT NULL default '',
straat varchar(100) NOT NULL default '',
postcode varchar(10) NOT NULL default '',
wijk varchar(40) NOT NULL default '',
plaats varchar(50) NOT NULL default '',
telefoon varchar(10) NOT NULL default '',
geboortedatum date NOT NULL default '0000-00-00',
geslacht varchar(5) NOT NULL default '',
email varchar(80) NOT NULL default '',
uin varchar(15) NOT NULL default '',
homepage varchar(100) NOT NULL default '',
internet varchar(15) NOT NULL default '',
scherk varchar(30) NOT NULL default '',
favo_boek varchar(50) NOT NULL default '',
favo_tijdschrift varchar(50) NOT NULL default '',
favo_tv varchar(50) NOT NULL default '',
favo_eten varchar(50) NOT NULL default '',
favo_muziek varchar(30) NOT NULL default '',
info text NOT NULL default '',
ipnr varchar(30) NOT NULL default '',
PRIMARY KEY  (member_id)
) ENGINE=MyISAM PACK_KEYS=1;
Warnings:
Warning	1101	BLOB/TEXT column 'info' can't have a default value
insert into t1 (member_id) values (1),(2),(3);
select member_id, nickname, voornaam FROM t1
ORDER by lastchange_datum DESC LIMIT 2;
member_id	nickname	voornaam
1		
2		
drop table t1;
create table t1 (a int not null, b int, c varchar(10), key (a, b, c));
insert into t1 values (1, NULL, NULL), (1, NULL, 'b'), (1, 1, NULL), (1, 1, 'b'), (1, 1, 'b'), (2, 1, 'a'), (2, 1, 'b'), (2, 2, 'a'), (2, 2, 'b'), (2, 3, 'c'),(1,3,'b');
explain select * from t1 where (a = 1 and b is null and c = 'b') or (a > 2) order by a desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	a	a	22	NULL	11	Using where; Using index
select * from t1 where (a = 1 and b is null and c = 'b') or (a > 2) order by a desc;
a	b	c
1	NULL	b
explain select * from t1 where a >= 1 and a < 3 order by a desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	a	a	4	NULL	10	Using where; Using index
select * from t1 where a >= 1 and a < 3 order by a desc;
a	b	c
2	3	c
2	2	b
2	2	a
2	1	b
2	1	a
1	3	b
1	1	b
1	1	b
1	1	NULL
1	NULL	b
1	NULL	NULL
explain select * from t1 where a = 1 order by a desc, b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	a	a	4	const	5	Using where; Using index
select * from t1 where a = 1 order by a desc, b desc;
a	b	c
1	3	b
1	1	b
1	1	b
1	1	NULL
1	NULL	b
1	NULL	NULL
explain select * from t1 where a = 1 and b is null order by a desc, b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	a	a	9	const,const	2	Using where; Using index; Using filesort
select * from t1 where a = 1 and b is null order by a desc, b desc;
a	b	c
1	NULL	NULL
1	NULL	b
explain select * from t1 where a >= 1 and a < 3 and b >0 order by a desc,b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	a	a	9	NULL	8	Using where; Using index
explain select * from t1 where a = 2 and b >0 order by a desc,b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	a	a	9	NULL	5	Using where; Using index
explain select * from t1 where a = 2 and b is null order by a desc,b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	a	a	9	const,const	1	Using where; Using index; Using filesort
explain select * from t1 where a = 2 and (b is null or b > 0) order by a
desc,b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	a	a	9	NULL	6	Using where; Using index
explain select * from t1 where a = 2 and b > 0 order by a desc,b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	a	a	9	NULL	5	Using where; Using index
explain select * from t1 where a = 2 and b < 2 order by a desc,b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	a	a	9	NULL	2	Using where; Using index
explain select * from t1 where a = 1 order by b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	a	a	4	const	5	Using where; Using index
select * from t1 where a = 1 order by b desc;
a	b	c
1	3	b
1	1	b
1	1	b
1	1	NULL
1	NULL	b
1	NULL	NULL
alter table t1 modify b int not null, modify c varchar(10) not null;
Warnings:
Warning	1265	Data truncated for column 'b' at row 1
Warning	1265	Data truncated for column 'c' at row 1
Warning	1265	Data truncated for column 'b' at row 2
Warning	1265	Data truncated for column 'c' at row 3
explain select * from t1 order by a, b, c;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	a	20	NULL	11	Using index
select * from t1 order by a, b, c;
a	b	c
1	0	
1	0	b
1	1	
1	1	b
1	1	b
1	3	b
2	1	a
2	1	b
2	2	a
2	2	b
2	3	c
explain select * from t1 order by a desc, b desc, c desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	a	20	NULL	11	Using index
select * from t1 order by a desc, b desc, c desc;
a	b	c
2	3	c
2	2	b
2	2	a
2	1	b
2	1	a
1	3	b
1	1	b
1	1	b
1	1	
1	0	b
1	0	
explain select * from t1 where (a = 1 and b = 1 and c = 'b') or (a > 2) order by a desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	a	a	20	NULL	3	Using where; Using index
select * from t1 where (a = 1 and b = 1 and c = 'b') or (a > 2) order by a desc;
a	b	c
1	1	b
1	1	b
explain select * from t1 where a < 2 and b <= 1 order by a desc, b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	a	a	4	NULL	6	Using where; Using index
select * from t1 where a < 2 and b <= 1 order by a desc, b desc;
a	b	c
1	1	b
1	1	b
1	1	
1	0	b
1	0	
select count(*) from t1 where a < 5 and b > 0;
count(*)
9
select * from t1 where a < 5 and b > 0 order by a desc,b desc;
a	b	c
2	3	c
2	2	b
2	2	a
2	1	b
2	1	a
1	3	b
1	1	b
1	1	b
1	1	
explain select * from t1 where a between 1 and 3 and b <= 1 order by a desc, b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	a	a	8	NULL	10	Using where; Using index
select * from t1 where a between 1 and 3 and b <= 1 order by a desc, b desc;
a	b	c
2	1	b
2	1	a
1	1	b
1	1	b
1	1	
1	0	b
1	0	
explain select * from t1 where a between 0 and 1 order by a desc, b desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	a	a	4	NULL	5	Using where; Using index
select * from t1 where a between 0 and 1 order by a desc, b desc;
a	b	c
1	3	b
1	1	b
1	1	b
1	1	
1	0	b
1	0	
drop table t1;
CREATE TABLE t1 (
gid int(10) unsigned NOT NULL auto_increment,
cid smallint(5) unsigned NOT NULL default '0',
PRIMARY KEY  (gid),
KEY component_id (cid)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (103853,108),(103867,108),(103962,108),(104505,108),(104619,108),(104620,108);
ALTER TABLE t1 add skr int(10) not null;
CREATE TABLE t2 (
gid int(10) unsigned NOT NULL default '0',
uid smallint(5) unsigned NOT NULL default '1',
sid tinyint(3) unsigned NOT NULL default '1',
PRIMARY KEY  (gid),
KEY uid (uid),
KEY status_id (sid)
) ENGINE=MyISAM;
INSERT INTO t2 VALUES (103853,250,5),(103867,27,5),(103962,27,5),(104505,117,5),(104619,75,5),(104620,15,5);
CREATE TABLE t3 (
uid smallint(6) NOT NULL auto_increment,
PRIMARY KEY  (uid)
) ENGINE=MyISAM;
INSERT INTO t3 VALUES (1),(15),(27),(75),(117),(250);
ALTER TABLE t3 add skr int(10) not null;
select t1.gid, t2.sid, t3.uid from t2, t1, t3 where t2.gid = t1.gid and t2.uid = t3.uid order by t3.uid, t1.gid;
gid	sid	uid
104620	5	15
103867	5	27
103962	5	27
104619	5	75
104505	5	117
103853	5	250
select t1.gid, t2.sid, t3.uid from t3, t2, t1 where t2.gid = t1.gid and t2.uid = t3.uid order by t3.uid, t1.gid;
gid	sid	uid
104620	5	15
103867	5	27
103962	5	27
104619	5	75
104505	5	117
103853	5	250
EXPLAIN select t1.gid, t2.sid, t3.uid from t3, t2, t1 where t2.gid = t1.gid and t2.uid = t3.uid order by t1.gid, t3.uid;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	PRIMARY,uid	NULL	NULL	NULL	6	Using temporary; Using filesort
1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	2	test.t2.uid	1	Using where; Using index
1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.gid	1	Using index
EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.gid = t3.uid order by t1.gid,t3.skr;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	ALL	PRIMARY	NULL	NULL	NULL	6	Using temporary; Using filesort
1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t3.uid	1	Using where; Using index
EXPLAIN SELECT t1.gid, t2.sid, t3.uid from t2, t1, t3 where t2.gid = t1.gid and t2.uid = t3.uid order by t3.uid, t1.gid;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	PRIMARY,uid	NULL	NULL	NULL	6	Using temporary; Using filesort
1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.gid	1	Using index
1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	2	test.t2.uid	1	Using where; Using index
EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.gid = t3.uid order by t3.skr,t1.gid;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	ALL	PRIMARY	NULL	NULL	NULL	6	Using temporary; Using filesort
1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t3.uid	1	Using where; Using index
EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.skr = t3.uid order by t1.gid,t3.skr;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	6	Using temporary; Using filesort
1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	2	test.t1.skr	1	Using where
drop table t1,t2,t3;
CREATE TABLE t1 (
`titre` char(80) NOT NULL default '',
`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
`date` datetime NOT NULL default '0000-00-00 00:00:00',
`auteur` char(35) NOT NULL default '',
`icone` tinyint(2) unsigned NOT NULL default '0',
`lastauteur` char(35) NOT NULL default '',
`nbrep` smallint(6) unsigned NOT NULL default '0',
`dest` char(35) NOT NULL default '',
`lu` tinyint(1) unsigned NOT NULL default '0',
`vue` mediumint(8) unsigned NOT NULL default '0',
`ludest` tinyint(1) unsigned NOT NULL default '0',
`ouvert` tinyint(1) unsigned NOT NULL default '1',
PRIMARY KEY  (`numeropost`),
KEY `date` (`date`),
KEY `dest` (`dest`,`ludest`),
KEY `auteur` (`auteur`,`lu`),
KEY `auteur_2` (`auteur`,`date`),
KEY `dest_2` (`dest`,`date`)
) CHECKSUM=1;
CREATE TABLE t2 (
`numeropost` mediumint(8) unsigned NOT NULL default '0',
`pseudo` char(35) NOT NULL default '',
PRIMARY KEY  (`numeropost`,`pseudo`),
KEY `pseudo` (`pseudo`)
);
INSERT INTO t1 (titre,auteur,dest) VALUES ('test','joce','bug');
INSERT INTO t2 (numeropost,pseudo) VALUES (1,'joce'),(1,'bug');
SELECT titre,t1.numeropost,auteur,icone,nbrep,0,date,vue,ouvert,lastauteur,dest FROM t2 LEFT JOIN t1 USING(numeropost) WHERE t2.pseudo='joce' ORDER BY date DESC LIMIT 0,30;
titre	numeropost	auteur	icone	nbrep	0	date	vue	ouvert	lastauteur	dest
test	1	joce	0	0	0	0000-00-00 00:00:00	0	1		bug
SELECT titre,numeropost,auteur,icone,nbrep,0,date,vue,ouvert,lastauteur,dest FROM t2 LEFT JOIN t1 USING(numeropost) WHERE t2.pseudo='joce' ORDER BY date DESC LIMIT 0,30;
titre	numeropost	auteur	icone	nbrep	0	date	vue	ouvert	lastauteur	dest
test	1	joce	0	0	0	0000-00-00 00:00:00	0	1		bug
SELECT titre,t1.numeropost,auteur,icone,nbrep,'0',date,vue,ouvert,lastauteur,dest FROM t2 LEFT JOIN t1 USING(numeropost) WHERE t2.pseudo='joce' ORDER BY date DESC LIMIT 0,30;
titre	numeropost	auteur	icone	nbrep	0	date	vue	ouvert	lastauteur	dest
test	1	joce	0	0	0	0000-00-00 00:00:00	0	1		bug
SELECT titre,numeropost,auteur,icone,nbrep,'0',date,vue,ouvert,lastauteur,dest FROM t2 LEFT JOIN t1 USING(numeropost) WHERE t2.pseudo='joce' ORDER BY date DESC LIMIT 0,30;
titre	numeropost	auteur	icone	nbrep	0	date	vue	ouvert	lastauteur	dest
test	1	joce	0	0	0	0000-00-00 00:00:00	0	1		bug
drop table t1,t2;
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (1, 2);
INSERT INTO t1 VALUES (3, 4);
INSERT INTO t1 VALUES (5, NULL);
SELECT * FROM t1 ORDER BY b;
a	b
5	NULL
1	2
3	4
SELECT * FROM t1 ORDER BY b DESC;
a	b
3	4
1	2
5	NULL
SELECT * FROM t1 ORDER BY (a + b);
a	b
5	NULL
1	2
3	4
SELECT * FROM t1 ORDER BY (a + b) DESC;
a	b
3	4
1	2
5	NULL
DROP TABLE t1;
create table t1(id int not null auto_increment primary key, t char(12));
explain select id,t from t1 order by id;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	1000	Using filesort
explain select id,t from t1 force index (primary) order by id;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	index	NULL	PRIMARY	4	NULL	1000	
drop table t1;
CREATE TABLE t1 (
FieldKey varchar(36) NOT NULL default '',
LongVal bigint(20) default NULL,
StringVal mediumtext,
KEY FieldKey (FieldKey),
KEY LongField (FieldKey,LongVal),
KEY StringField (FieldKey,StringVal(32))
);
INSERT INTO t1 VALUES ('0',3,'0'),('0',2,'1'),('0',1,'2'),('1',2,'1'),('1',1,'3'), ('1',0,'2'),('2',3,'0'),('2',2,'1'),('2',1,'2'),('2',3,'0'),('2',2,'1'),('2',1,'2'),('3',2,'1'),('3',1,'2'),('3','3','3');
EXPLAIN SELECT * FROM t1 WHERE FieldKey = '1' ORDER BY LongVal;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref	FieldKey,LongField,StringField	LongField	38	const	3	Using where
SELECT * FROM t1 WHERE FieldKey = '1' ORDER BY LongVal;
FieldKey	LongVal	StringVal
1	0	2
1	1	3
1	2	1
EXPLAIN SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY LongVal;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	FieldKey,LongField,StringField	FieldKey	38	NULL	4	Using where; Using filesort
SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY LongVal;
FieldKey	LongVal	StringVal
3	1	2
3	2	1
3	3	3
EXPLAIN SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY FieldKey, LongVal;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	FieldKey,LongField,StringField	LongField	38	NULL	4	Using where
SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY FieldKey, LongVal;
FieldKey	LongVal	StringVal
3	1	2
3	2	1
3	3	3
DROP TABLE t1;
CREATE TABLE t1 (a INT, b INT);
SET @id=0;
UPDATE t1 SET a=0 ORDER BY (a=@id), b;
DROP TABLE t1;
CREATE TABLE t1 (  id smallint(6) unsigned NOT NULL default '0',  menu tinyint(4) NOT NULL default '0',  KEY id (id),  KEY menu (menu)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (11384, 2),(11392, 2);
SELECT id FROM t1 WHERE id <11984 AND menu =2 ORDER BY id DESC LIMIT 1 ;
id
11392
drop table t1;
create table t1(a int, b int, index(b));
insert into t1 values (2, 1), (1, 1), (4, NULL), (3, NULL), (6, 2), (5, 2);
explain select * from t1 where b=1 or b is null order by a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref_or_null	b	b	5	const	3	Using where; Using filesort
select * from t1 where b=1 or b is null order by a;
a	b
1	1
2	1
3	NULL
4	NULL
explain select * from t1 where b=2 or b is null order by a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ref_or_null	b	b	5	const	4	Using where; Using filesort
select * from t1 where b=2 or b is null order by a;
a	b
3	NULL
4	NULL
5	2
6	2
drop table t1;
create table t1 (a int not null auto_increment, b int not null, c int not null, d int not null,
key(a,b,d), key(c,b,a));
create table t2 like t1;
insert into t1 values (NULL, 1, 2, 0), (NULL, 2, 1, 1), (NULL, 3, 4, 2), (NULL, 4, 3, 3);
insert into t2 select null, b, c, d from t1;
insert into t1 select null, b, c, d from t2;
insert into t2 select null, b, c, d from t1;
insert into t1 select null, b, c, d from t2;
insert into t2 select null, b, c, d from t1;
insert into t1 select null, b, c, d from t2;
insert into t2 select null, b, c, d from t1;
insert into t1 select null, b, c, d from t2;
insert into t2 select null, b, c, d from t1;
insert into t1 select null, b, c, d from t2;
optimize table t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	status	OK
set @row=10;
insert into t1 select 1, b, c + (@row:=@row - 1) * 10, d - @row from t2 limit 10;
select * from t1 where a=1 and b in (1) order by c, b, a;
a	b	c	d
1	1	2	0
1	1	12	-1
1	1	52	-5
1	1	92	-9
select * from t1 where a=1 and b in (1);
a	b	c	d
1	1	92	-9
1	1	52	-5
1	1	12	-1
1	1	2	0
drop table t1, t2;
create table t1 (col1 int, col int);
create table t2 (col2 int, col int);
insert into t1 values (1,1),(2,2),(3,3);
insert into t2 values (1,3),(2,2),(3,1);
select t1.* , t2.col as t2_col from t1 left join t2 on (t1.col1=t2.col2)
order by col;
col1	col	t2_col
1	1	3
2	2	2
3	3	1
select col1 as col, col from t1 order by col;
ERROR 23000: Column 'col' in order clause is ambiguous
select t1.col as c1, t2.col as c2 from t1, t2 where t1.col1=t2.col2
order by col;
ERROR 23000: Column 'col' in order clause is ambiguous
select t1.col as c1, t2.col as c2 from t1, t2 where t1.col1=t2.col2
order by col;
ERROR 23000: Column 'col' in order clause is ambiguous
select col1 from t1, t2 where t1.col1=t2.col2 order by col;
ERROR 23000: Column 'col' in order clause is ambiguous
select t1.col as t1_col, t2.col2 from t1, t2 where t1.col1=t2.col2
order by col;
ERROR 23000: Column 'col' in order clause is ambiguous
select t1.col as t1_col, t2.col from t1, t2 where t1.col1=t2.col2
order by col;
t1_col	col
3	1
2	2
1	3
select col2 as c, col as c from t2 order by col;
c	c
3	1
2	2
1	3
select col2 as col, col as col2 from t2 order by col;
col	col2
1	3
2	2
3	1
select t2.col2, t2.col, t2.col from t2 order by col;
col2	col	col
3	1	1
2	2	2
1	3	3
select t2.col2 as col from t2 order by t2.col;
col
3
2
1
select t2.col2 as col, t2.col from t2 order by t2.col;
col	col
3	1
2	2
1	3
select t2.col2, t2.col, t2.col from t2 order by t2.col;
col2	col	col
3	1	1
2	2	2
1	3	3
drop table t1, t2;
create table t1 (a char(25));
insert into t1 set a = repeat('x', 20);
insert into t1 set a = concat(repeat('x', 19), 'z');
insert into t1 set a = concat(repeat('x', 19), 'ab');
insert into t1 set a = concat(repeat('x', 19), 'aa');
set max_sort_length=20;
select a from t1 order by a;
a
xxxxxxxxxxxxxxxxxxxab
xxxxxxxxxxxxxxxxxxxaa
xxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxz
drop table t1;
create table t1 (
`sid` decimal(8,0) default null,
`wnid` varchar(11) not null default '',
key `wnid14` (`wnid`(4)),
key `wnid` (`wnid`)
) engine=myisam default charset=latin1;
insert into t1 (`sid`, `wnid`) values
('10100','01019000000'),('37986','01019000000'),('37987','01019010000'),
('39560','01019090000'),('37989','01019000000'),('37990','01019011000'),
('37991','01019011000'),('37992','01019019000'),('37993','01019030000'),
('37994','01019090000'),('475','02070000000'),('25253','02071100000'),
('25255','02071100000'),('25256','02071110000'),('25258','02071130000'),
('25259','02071190000'),('25260','02071200000'),('25261','02071210000'),
('25262','02071290000'),('25263','02071300000'),('25264','02071310000'),
('25265','02071310000'),('25266','02071320000'),('25267','02071320000'),
('25269','02071330000'),('25270','02071340000'),('25271','02071350000'),
('25272','02071360000'),('25273','02071370000'),('25281','02071391000'),
('25282','02071391000'),('25283','02071399000'),('25284','02071400000'),
('25285','02071410000'),('25286','02071410000'),('25287','02071420000'),
('25288','02071420000'),('25291','02071430000'),('25290','02071440000'),
('25292','02071450000'),('25293','02071460000'),('25294','02071470000'),
('25295','02071491000'),('25296','02071491000'),('25297','02071499000');
explain select * from t1 where wnid like '0101%' order by wnid;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	wnid14,wnid	wnid	13	NULL	10	Using where
select * from t1 where wnid like '0101%' order by wnid;
sid	wnid
10100	01019000000
37986	01019000000
37989	01019000000
37987	01019010000
37990	01019011000
37991	01019011000
37992	01019019000
37993	01019030000
39560	01019090000
37994	01019090000
drop table t1;
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (2), (1), (1), (2), (1);
SELECT a FROM t1 ORDER BY a;
a
1
1
1
2
2
(SELECT a FROM t1) ORDER BY a;
a
1
1
1
2
2
DROP TABLE t1;
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (1,30), (2,20), (1,10), (2,30), (1,20), (2,10);
(SELECT b,a FROM t1 ORDER BY a,b) ORDER BY b,a;
b	a
10	1
10	2
20	1
20	2
30	1
30	2
(SELECT b FROM t1 ORDER BY b DESC) ORDER BY b ASC;
b
10
10
20
20
30
30
(SELECT b,a FROM t1 ORDER BY b,a) ORDER BY a,b;
b	a
10	1
20	1
30	1
10	2
20	2
30	2
(SELECT b,a FROM t1 ORDER by b,a LIMIT 3) ORDER by a,b;
b	a
10	1
20	1
10	2
DROP TABLE t1;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
SELECT a + 1 AS num FROM t1 ORDER BY 30 - num;
num
3
2
SELECT CONCAT('test', a) AS str FROM t1 ORDER BY UPPER(str);
str
test1
test2
SELECT a + 1 AS num FROM t1 GROUP BY 30 - num;
num
3
2
SELECT a + 1 AS num FROM t1 HAVING 30 - num;
num
2
3
SELECT a + 1 AS num, num + 1 FROM t1;
ERROR 42S22: Unknown column 'num' in 'field list'
SELECT a + 1 AS num, (select num + 2 FROM t1 LIMIT 1) FROM t1;
num	(select num + 2 FROM t1 LIMIT 1)
2	4
3	5
SELECT a.a + 1 AS num FROM t1 a JOIN t1 b ON num = b.a;
ERROR 42S22: Unknown column 'num' in 'on clause'
DROP TABLE t1;
CREATE TABLE bug25126 (
val int unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY
);
UPDATE bug25126 SET MissingCol = MissingCol;
ERROR 42S22: Unknown column 'MissingCol' in 'field list'
UPDATE bug25126 SET val = val ORDER BY MissingCol;
ERROR 42S22: Unknown column 'MissingCol' in 'order clause'
UPDATE bug25126 SET val = val ORDER BY val;
UPDATE bug25126 SET val = 1 ORDER BY val;
UPDATE bug25126 SET val = 1 ORDER BY MissingCol;
ERROR 42S22: Unknown column 'MissingCol' in 'order clause'
UPDATE bug25126 SET val = 1 ORDER BY val, MissingCol;
ERROR 42S22: Unknown column 'MissingCol' in 'order clause'
UPDATE bug25126 SET val = MissingCol ORDER BY MissingCol;
ERROR 42S22: Unknown column 'MissingCol' in 'order clause'
UPDATE bug25126 SET MissingCol = 1 ORDER BY val, MissingCol;
ERROR 42S22: Unknown column 'MissingCol' in 'order clause'
UPDATE bug25126 SET MissingCol = 1 ORDER BY MissingCol;
ERROR 42S22: Unknown column 'MissingCol' in 'order clause'
UPDATE bug25126 SET MissingCol = val ORDER BY MissingCol;
ERROR 42S22: Unknown column 'MissingCol' in 'order clause'
UPDATE bug25126 SET MissingCol = MissingCol ORDER BY MissingCol;
ERROR 42S22: Unknown column 'MissingCol' in 'order clause'
DROP TABLE bug25126;
CREATE TABLE t1 (a int);
SELECT p.a AS val, q.a AS val1 FROM t1 p, t1 q ORDER BY val > 1;
val	val1
SELECT p.a AS val, q.a AS val FROM t1 p, t1 q ORDER BY val;
ERROR 23000: Column 'val' in order clause is ambiguous
SELECT p.a AS val, q.a AS val FROM t1 p, t1 q ORDER BY val > 1;
ERROR 23000: Column 'val' in order clause is ambiguous
DROP TABLE t1;
CREATE TABLE t1 (a int);
INSERT INTO t1 VALUES (3), (2), (4), (1);
SELECT a, IF(a IN (2,3), a, a+10) FROM t1
ORDER BY IF(a IN (2,3), a, a+10);
a	IF(a IN (2,3), a, a+10)
2	2
3	3
1	11
4	14
SELECT a, IF(a NOT IN (2,3), a, a+10) FROM t1 
ORDER BY IF(a NOT IN (2,3), a, a+10);
a	IF(a NOT IN (2,3), a, a+10)
1	1
4	4
2	12
3	13
SELECT a, IF(a IN (2,3), a, a+10) FROM t1 
ORDER BY IF(a NOT IN (2,3), a, a+10);
a	IF(a IN (2,3), a, a+10)
1	11
4	14
2	2
3	3
SELECT a, IF(a BETWEEN 2 AND 3, a, a+10) FROM t1
ORDER BY IF(a BETWEEN 2 AND 3, a, a+10);
a	IF(a BETWEEN 2 AND 3, a, a+10)
2	2
3	3
1	11
4	14
SELECT a, IF(a NOT BETWEEN 2 AND 3, a, a+10) FROM t1 
ORDER BY IF(a NOT BETWEEN 2 AND 3, a, a+10);
a	IF(a NOT BETWEEN 2 AND 3, a, a+10)
1	1
4	4
2	12
3	13
SELECT a, IF(a BETWEEN 2 AND 3, a, a+10) FROM t1 
ORDER BY IF(a NOT BETWEEN 2 AND 3, a, a+10);
a	IF(a BETWEEN 2 AND 3, a, a+10)
1	11
4	14
2	2
3	3
SELECT IF(a IN (1,2), a, '') as x1, IF(a NOT IN (1,2), a, '') as x2
FROM t1 GROUP BY x1, x2;
x1	x2
	3
	4
1	
2	
SELECT IF(a IN (1,2), a, '') as x1, IF(a NOT IN (1,2), a, '') as x2
FROM t1 GROUP BY x1, IF(a NOT IN (1,2), a, '');
x1	x2
	3
	4
1	
2	
SELECT a, a IN (1,2) FROM t1 ORDER BY a IN (1,2);
a	a IN (1,2)
3	0
4	0
2	1
1	1
SELECT a FROM t1 ORDER BY a IN (1,2);
a
3
4
2
1
SELECT a+10 FROM t1 ORDER BY a IN (1,2);
a+10
13
14
12
11
SELECT a, IF(a IN (1,2), a, a+10) FROM t1
ORDER BY IF(a IN (3,4), a, a+10);
a	IF(a IN (1,2), a, a+10)
3	13
4	14
1	1
2	2
DROP TABLE t1;
create table t1 (a int not null, b  int not null, c int not null);
insert t1 values (1,1,1),(1,1,2),(1,2,1);
select a, b from t1 group by a, b order by sum(c);
a	b
1	2
1	1
drop table t1;
CREATE TABLE t1 (a int, b int, PRIMARY KEY  (a));
INSERT INTO t1 VALUES (1,1), (2,2), (3,3);
explain SELECT t1.b as a, t2.b as c FROM 
t1 LEFT JOIN t1 t2 ON (t1.a = t2.a AND t2.a = 2) 
ORDER BY c;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using temporary; Using filesort
1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	
SELECT t2.b as c FROM 
t1 LEFT JOIN t1 t2 ON (t1.a = t2.a AND t2.a = 2) 
ORDER BY c;
c
NULL
NULL
2
explain SELECT t1.b as a, t2.b as c FROM 
t1 JOIN t1 t2 ON (t1.a = t2.a AND t2.a = 2)  
ORDER BY c;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 SELECT * from t1;
CREATE TABLE t3 LIKE t1;
INSERT INTO t3 SELECT * from t1;
CREATE TABLE t4 LIKE t1;
INSERT INTO t4 SELECT * from t1;
INSERT INTO t1 values (0,0),(4,4);
SELECT t2.b FROM t1 LEFT JOIN (t2, t3 LEFT JOIN t4 ON t3.a=t4.a)
ON (t1.a=t2.a AND t1.b=t3.b) order by t2.b;
b
NULL
NULL
1
2
3
DROP TABLE t1,t2,t3,t4;
create table t1 (a int, b int, c int);
insert into t1 values (1,2,3), (9,8,3), (19,4,3), (1,4,9);
select a,(sum(b)/sum(c)) as ratio from t1 group by a order by sum(b)/sum(c) asc;
a	ratio
1	0.5000
19	1.3333
9	2.6667
drop table t1;
CREATE TABLE t1 (a INT UNSIGNED NOT NULL, b TIME);
INSERT INTO t1 (a) VALUES (100000), (0), (100), (1000000),(10000), (1000), (10);
UPDATE t1 SET b = SEC_TO_TIME(a);
SELECT a, b FROM t1 ORDER BY b DESC;
a	b
1000000	277:46:40
100000	27:46:40
10000	02:46:40
1000	00:16:40
100	00:01:40
10	00:00:10
0	00:00:00
SELECT a, b FROM t1 ORDER BY SEC_TO_TIME(a) DESC;
a	b
1000000	277:46:40
100000	27:46:40
10000	02:46:40
1000	00:16:40
100	00:01:40
10	00:00:10
0	00:00:00
DROP TABLE t1;
CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a), UNIQUE KEY b (b));
INSERT INTO t1 VALUES (1,1),(2,2);
CREATE TABLE t2 (a INT, b INT, KEY a (a,b));
INSERT INTO t2 VALUES (1,1),(1,2),(2,1),(2,2);
EXPLAIN SELECT 1 FROM t1,t2 WHERE t1.b=2 AND t1.a=t2.a ORDER BY t2.b;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	const	PRIMARY,b	b	5	const	1	
1	SIMPLE	t2	ref	a	a	5	const	2	Using where; Using index
DROP TABLE t1,t2;
CREATE TABLE t1(
id int auto_increment PRIMARY KEY, c2 int, c3 int, INDEX k2(c2), INDEX k3(c3));
INSERT INTO t1 (c2,c3) VALUES
(31,34),(35,38),(34,31),(32,35),(31,39),
(11,14),(15,18),(14,11),(12,15),(11,19);
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
INSERT INTO t1 (c2,c3) SELECT c2,c3 FROM t1;
UPDATE t1 SET c2=20 WHERE id%100 = 0;
SELECT COUNT(*) FROM t1;
COUNT(*)
40960
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 SELECT * FROM t1 ORDER BY id;
EXPLAIN SELECT id,c3 FROM t2 WHERE c2=11 ORDER BY c3 LIMIT 20;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	index	k2	k3	5	NULL	111	Using where
EXPLAIN SELECT id,c3 FROM t2 WHERE c2=11 ORDER BY c3 LIMIT 4000;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ref	k2	k2	5	const	7341	Using where; Using filesort
EXPLAIN SELECT id,c3 FROM t2 WHERE c2 BETWEEN 10 AND 12 ORDER BY c3 LIMIT 20;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	index	k2	k3	5	NULL	73	Using where
EXPLAIN SELECT id,c3 FROM t2 WHERE c2 BETWEEN 20 AND 30 ORDER BY c3 LIMIT 4000;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	range	k2	k2	5	NULL	386	Using where; Using filesort
SELECT id,c3 FROM t2 WHERE c2=11 ORDER BY c3 LIMIT 20;
id	c3
6	14
16	14
26	14
36	14
46	14
56	14
66	14
76	14
86	14
96	14
106	14
116	14
126	14
136	14
146	14
156	14
166	14
176	14
186	14
196	14
DROP TABLE t1,t2;
