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+#
+# test of left outer join
+#
+
+drop table if exists t1,t2,t3,t4,t5;
+
+CREATE TABLE t1 (
+ grp int(11) default NULL,
+ a bigint(20) unsigned default NULL,
+ c char(10) NOT NULL default ''
+) TYPE=MyISAM;
+INSERT INTO t1 VALUES (1,1,'a'),(2,2,'b'),(2,3,'c'),(3,4,'E'),(3,5,'C'),(3,6,'D'),(NULL,NULL,'');
+create table t2 (id int, a bigint unsigned not null, c char(10), d int, primary key (a));
+insert into t2 values (1,1,"a",1),(3,4,"A",4),(3,5,"B",5),(3,6,"C",6),(4,7,"D",7);
+
+select t1.*,t2.* from t1 JOIN t2 where t1.a=t2.a;
+select t1.*,t2.* from t1 left join t2 on (t1.a=t2.a) order by t1.grp,t1.a,t2.c;
+select t1.*,t2.* from { oj t2 left outer join t1 on (t1.a=t2.a) };
+select t1.*,t2.* from t1 as t0,{ oj t2 left outer join t1 on (t1.a=t2.a) } WHERE t0.a=2;
+select t1.*,t2.* from t1 left join t2 using (a);
+select t1.*,t2.* from t1 left join t2 using (a,c);
+select t1.*,t2.* from t1 left join t2 using (c);
+select t1.*,t2.* from t1 natural left outer join t2;
+
+select t1.*,t2.* from t1 left join t2 on (t1.a=t2.a) where t2.id=3;
+select t1.*,t2.* from t1 left join t2 on (t1.a=t2.a) where t2.id is null;
+
+explain select t1.*,t2.* from t1,t2 where t1.a=t2.a and isnull(t2.a)=1;
+explain select t1.*,t2.* from t1 left join t2 on t1.a=t2.a where isnull(t2.a)=1;
+
+select t1.*,t2.*,t3.a from t1 left join t2 on (t1.a=t2.a) left join t1 as t3 on (t2.a=t3.a);
+
+# The next query should rearange the left joins to get this to work
+!$1120 explain select t1.*,t2.*,t3.a from t1 left join t2 on (t3.a=t2.a) left join t1 as t3 on (t1.a=t3.a);
+!$1120 select t1.*,t2.*,t3.a from t1 left join t2 on (t3.a=t2.a) left join t1 as t3 on (t1.a=t3.a);
+
+# The next query should give an error in MySQL
+!$1120 select t1.*,t2.*,t3.a from t1 left join t2 on (t3.a=t2.a) left join t1 as t3 on (t2.a=t3.a);
+
+# Test of inner join
+select t1.*,t2.* from t1 inner join t2 using (a);
+select t1.*,t2.* from t1 inner join t2 on (t1.a=t2.a);
+select t1.*,t2.* from t1 natural join t2;
+
+drop table t1,t2;
+
+#
+# Test of left join bug
+#
+
+CREATE TABLE t1 (
+ usr_id INT unsigned NOT NULL,
+ uniq_id INT unsigned NOT NULL AUTO_INCREMENT,
+ start_num INT unsigned NOT NULL DEFAULT 1,
+ increment INT unsigned NOT NULL DEFAULT 1,
+ PRIMARY KEY (uniq_id),
+ INDEX usr_uniq_idx (usr_id, uniq_id),
+ INDEX uniq_usr_idx (uniq_id, usr_id)
+);
+CREATE TABLE t2 (
+ id INT unsigned NOT NULL DEFAULT 0,
+ usr2_id INT unsigned NOT NULL DEFAULT 0,
+ max INT unsigned NOT NULL DEFAULT 0,
+ c_amount INT unsigned NOT NULL DEFAULT 0,
+ d_max INT unsigned NOT NULL DEFAULT 0,
+ d_num INT unsigned NOT NULL DEFAULT 0,
+ orig_time INT unsigned NOT NULL DEFAULT 0,
+ c_time INT unsigned NOT NULL DEFAULT 0,
+ active ENUM ("no","yes") NOT NULL,
+ PRIMARY KEY (id,usr2_id),
+ INDEX id_idx (id),
+ INDEX usr2_idx (usr2_id)
+);
+INSERT INTO t1 VALUES (3,NULL,0,50),(3,NULL,0,200),(3,NULL,0,25),(3,NULL,0,84676),(3,NULL,0,235),(3,NULL,0,10),(3,NULL,0,3098),(3,NULL,0,2947),(3,NULL,0,8987),(3,NULL,0,8347654),(3,NULL,0,20398),(3,NULL,0,8976),(3,NULL,0,500),(3,NULL,0,198);
+
+#1st select shows that one record is returned with null entries for the right
+#table, when selecting on an id that does not exist in the right table t2
+SELECT t1.usr_id,t1.uniq_id,t1.increment,
+t2.usr2_id,t2.c_amount,t2.max
+FROM t1
+LEFT JOIN t2 ON t2.id = t1.uniq_id
+WHERE t1.uniq_id = 4
+ORDER BY t2.c_amount;
+
+# The same with RIGHT JOIN
+SELECT t1.usr_id,t1.uniq_id,t1.increment,
+t2.usr2_id,t2.c_amount,t2.max
+FROM t2
+RIGHT JOIN t1 ON t2.id = t1.uniq_id
+WHERE t1.uniq_id = 4
+ORDER BY t2.c_amount;
+
+INSERT INTO t2 VALUES (2,3,3000,6000,0,0,746584,837484,'yes');
+!$1062 INSERT INTO t2 VALUES (2,3,3000,6000,0,0,746584,837484,'yes');
+INSERT INTO t2 VALUES (7,3,1000,2000,0,0,746294,937484,'yes');
+
+#3rd select should show that one record is returned with null entries for the
+# right table, when selecting on an id that does not exist in the right table
+# t2 but this select returns an empty set!!!!
+SELECT t1.usr_id,t1.uniq_id,t1.increment,t2.usr2_id,t2.c_amount,t2.max FROM t1 LEFT JOIN t2 ON t2.id = t1.uniq_id WHERE t1.uniq_id = 4 ORDER BY t2.c_amount;
+SELECT t1.usr_id,t1.uniq_id,t1.increment,t2.usr2_id,t2.c_amount,t2.max FROM t1 LEFT JOIN t2 ON t2.id = t1.uniq_id WHERE t1.uniq_id = 4 GROUP BY t2.c_amount;
+# Removing the ORDER BY works:
+SELECT t1.usr_id,t1.uniq_id,t1.increment,t2.usr2_id,t2.c_amount,t2.max FROM t1 LEFT JOIN t2 ON t2.id = t1.uniq_id WHERE t1.uniq_id = 4;
+
+drop table t1,t2;
+
+#
+# Test of LEFT JOIN with const tables (failed for frankie@etsetb.upc.es)
+#
+
+drop table if exists t1,t2,t3,t4;
+CREATE TABLE t1 (
+ cod_asig int(11) DEFAULT '0' NOT NULL,
+ desc_larga_cat varchar(80) DEFAULT '' NOT NULL,
+ desc_larga_cas varchar(80) DEFAULT '' NOT NULL,
+ desc_corta_cat varchar(40) DEFAULT '' NOT NULL,
+ desc_corta_cas varchar(40) DEFAULT '' NOT NULL,
+ cred_total double(3,1) DEFAULT '0.0' NOT NULL,
+ pre_requisit int(11),
+ co_requisit int(11),
+ preco_requisit int(11),
+ PRIMARY KEY (cod_asig)
+);
+
+INSERT INTO t1 VALUES (10360,'asdfggfg','Introduccion a los Ordenadores I','asdfggfg','Introduccio Ordinadors I',6.0,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (10361,'Components i Circuits Electronics I','Componentes y Circuitos Electronicos I','Components i Circuits Electronics I','Comp. i Circ. Electr. I',6.0,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (10362,'Laboratori d`Ordinadors','Laboratorio de Ordenadores','Laboratori d`Ordinadors','Laboratori Ordinadors',4.5,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (10363,'Tecniques de Comunicacio Oral i Escrita','Tecnicas de Comunicacion Oral y Escrita','Tecniques de Comunicacio Oral i Escrita','Tec. Com. Oral i Escrita',4.5,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (11403,'Projecte Fi de Carrera','Proyecto Fin de Carrera','Projecte Fi de Carrera','PFC',9.0,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (11404,'+lgebra lineal','Algebra lineal','+lgebra lineal','+lgebra lineal',15.0,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (11405,'+lgebra lineal','Algebra lineal','+lgebra lineal','+lgebra lineal',18.0,NULL,NULL,NULL);
+INSERT INTO t1 VALUES (11406,'Calcul Infinitesimal','Cßlculo Infinitesimal','Calcul Infinitesimal','Calcul Infinitesimal',15.0,NULL,NULL,NULL);
+
+CREATE TABLE t2 (
+ idAssignatura int(11) DEFAULT '0' NOT NULL,
+ Grup int(11) DEFAULT '0' NOT NULL,
+ Places smallint(6) DEFAULT '0' NOT NULL,
+ PlacesOcupades int(11) DEFAULT '0',
+ PRIMARY KEY (idAssignatura,Grup)
+);
+
+
+INSERT INTO t2 VALUES (10360,12,333,0);
+INSERT INTO t2 VALUES (10361,30,2,0);
+INSERT INTO t2 VALUES (10361,40,3,0);
+INSERT INTO t2 VALUES (10360,45,10,0);
+INSERT INTO t2 VALUES (10362,10,12,0);
+INSERT INTO t2 VALUES (10360,55,2,0);
+INSERT INTO t2 VALUES (10360,70,0,0);
+INSERT INTO t2 VALUES (10360,565656,0,0);
+INSERT INTO t2 VALUES (10360,32767,7,0);
+INSERT INTO t2 VALUES (10360,33,8,0);
+INSERT INTO t2 VALUES (10360,7887,85,0);
+INSERT INTO t2 VALUES (11405,88,8,0);
+INSERT INTO t2 VALUES (10360,0,55,0);
+INSERT INTO t2 VALUES (10360,99,0,0);
+INSERT INTO t2 VALUES (11411,30,10,0);
+INSERT INTO t2 VALUES (11404,0,0,0);
+INSERT INTO t2 VALUES (10362,11,111,0);
+INSERT INTO t2 VALUES (10363,33,333,0);
+INSERT INTO t2 VALUES (11412,55,0,0);
+INSERT INTO t2 VALUES (50003,66,6,0);
+INSERT INTO t2 VALUES (11403,5,0,0);
+INSERT INTO t2 VALUES (11406,11,11,0);
+INSERT INTO t2 VALUES (11410,11410,131,0);
+INSERT INTO t2 VALUES (11416,11416,32767,0);
+INSERT INTO t2 VALUES (11409,0,0,0);
+
+CREATE TABLE t3 (
+ id int(11) DEFAULT '0' NOT NULL auto_increment,
+ dni_pasaporte char(16) DEFAULT '' NOT NULL,
+ idPla int(11) DEFAULT '0' NOT NULL,
+ cod_asig int(11) DEFAULT '0' NOT NULL,
+ any smallint(6) DEFAULT '0' NOT NULL,
+ quatrimestre smallint(6) DEFAULT '0' NOT NULL,
+ estat char(1) DEFAULT 'M' NOT NULL,
+ PRIMARY KEY (id),
+ UNIQUE dni_pasaporte (dni_pasaporte,idPla),
+ UNIQUE dni_pasaporte_2 (dni_pasaporte,idPla,cod_asig,any,quatrimestre)
+);
+
+INSERT INTO t3 VALUES (1,'11111111',1,10362,98,1,'M');
+
+CREATE TABLE t4 (
+ id int(11) DEFAULT '0' NOT NULL auto_increment,
+ papa int(11) DEFAULT '0' NOT NULL,
+ fill int(11) DEFAULT '0' NOT NULL,
+ idPla int(11) DEFAULT '0' NOT NULL,
+ PRIMARY KEY (id),
+ KEY papa (idPla,papa),
+ UNIQUE papa_2 (idPla,papa,fill)
+);
+
+INSERT INTO t4 VALUES (1,-1,10360,1);
+INSERT INTO t4 VALUES (2,-1,10361,1);
+INSERT INTO t4 VALUES (3,-1,10362,1);
+
+SELECT DISTINCT fill,desc_larga_cat,cred_total,Grup,Places,PlacesOcupades FROM t4 LEFT JOIN t3 ON t3.cod_asig=fill AND estat='S' AND dni_pasaporte='11111111' AND t3.idPla=1 , t2,t1 WHERE fill=t1.cod_asig AND Places>PlacesOcupades AND fill=idAssignatura AND t4.idPla=1 AND papa=-1;
+
+SELECT DISTINCT fill,t3.idPla FROM t4 LEFT JOIN t3 ON t3.cod_asig=t4.fill AND t3.estat='S' AND t3.dni_pasaporte='1234' AND t3.idPla=1 ;
+
+INSERT INTO t3 VALUES (3,'1234',1,10360,98,1,'S');
+SELECT DISTINCT fill,t3.idPla FROM t4 LEFT JOIN t3 ON t3.cod_asig=t4.fill AND t3.estat='S' AND t3.dni_pasaporte='1234' AND t3.idPla=1 ;
+
+drop table t1,t2,t3,test.t4;
+
+#
+# Test of IS NULL on AUTO_INCREMENT with LEFT JOIN
+#
+
+CREATE TABLE t1 (
+ id smallint(5) unsigned DEFAULT '0' NOT NULL auto_increment,
+ name char(60) DEFAULT '' NOT NULL,
+ PRIMARY KEY (id)
+);
+INSERT INTO t1 VALUES (1,'Antonio Paz');
+INSERT INTO t1 VALUES (2,'Lilliana Angelovska');
+INSERT INTO t1 VALUES (3,'Thimble Smith');
+
+CREATE TABLE t2 (
+ id smallint(5) unsigned DEFAULT '0' NOT NULL auto_increment,
+ owner smallint(5) unsigned DEFAULT '0' NOT NULL,
+ name char(60),
+ PRIMARY KEY (id)
+);
+INSERT INTO t2 VALUES (1,1,'El Gato');
+INSERT INTO t2 VALUES (2,1,'Perrito');
+INSERT INTO t2 VALUES (3,3,'Happy');
+
+select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner);
+select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.id is null;
+explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.id is null;
+explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.name is null;
+select count(*) from t1 left join t2 on (t1.id = t2.owner);
+
+select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner);
+select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.id is null;
+explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.id is null;
+explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.name is null;
+select count(*) from t2 right join t1 on (t1.id = t2.owner);
+
+select t1.name, t2.name, t2.id,t3.id from t2 right join t1 on (t1.id = t2.owner) left join t1 as t3 on t3.id=t2.owner;
+select t1.name, t2.name, t2.id,t3.id from t1 right join t2 on (t1.id = t2.owner) right join t1 as t3 on t3.id=t2.owner;
+select t1.name, t2.name, t2.id, t2.owner, t3.id from t1 left join t2 on (t1.id = t2.owner) right join t1 as t3 on t3.id=t2.owner;
+
+drop table t1,t2;
+
+create table t1 (id int not null, str char(10), index(str));
+insert into t1 values (1, null), (2, null), (3, "foo"), (4, "bar");
+select * from t1 where str is not null;
+select * from t1 where str is null;
+drop table t1;
+
+#
+# Test wrong LEFT JOIN query
+#
+
+CREATE TABLE t1 (
+ t1_id bigint(21) DEFAULT '0' NOT NULL auto_increment,
+ PRIMARY KEY (t1_id)
+);
+CREATE TABLE t2 (
+ t2_id bigint(21) DEFAULT '0' NOT NULL auto_increment,
+ PRIMARY KEY (t2_id)
+);
+CREATE TABLE t3 (
+ t3_id bigint(21) DEFAULT '0' NOT NULL auto_increment,
+ PRIMARY KEY (t3_id)
+);
+CREATE TABLE t4 (
+ seq_0_id bigint(21) DEFAULT '0' NOT NULL,
+ seq_1_id bigint(21) DEFAULT '0' NOT NULL,
+ KEY seq_0_id (seq_0_id),
+ KEY seq_1_id (seq_1_id)
+);
+CREATE TABLE t5 (
+ seq_0_id bigint(21) DEFAULT '0' NOT NULL,
+ seq_1_id bigint(21) DEFAULT '0' NOT NULL,
+ KEY seq_1_id (seq_1_id),
+ KEY seq_0_id (seq_0_id)
+);
+
+insert into t1 values (1);
+insert into t2 values (1);
+insert into t3 values (1);
+insert into t4 values (1,1);
+insert into t5 values (1,1);
+
+!$1120 explain select * from t3 left join t4 on t4.seq_1_id = t2.t2_id left join t1 on t1.t1_id = t4.seq_0_id left join t5 on t5.seq_0_id = t1.t1_id left join t2 on t2.t2_id = t5.seq_1_id where t3.t3_id = 23;
+
+drop table t1,t2,t3,t4,t5;
+
+#
+# Another LEFT JOIN problem
+# (The problem was that the result changed when we added ORDER BY)
+#
+
+create table t1 (n int, m int, o int, key(n));
+create table t2 (n int not null, m int, o int, primary key(n));
+insert into t1 values (1, 2, 11), (1, 2, 7), (2, 2, 8), (1,2,9),(1,3,9);
+insert into t2 values (1, 2, 3),(2, 2, 8), (4,3,9),(3,2,10);
+select t1.*, t2.* from t1 left join t2 on t1.n = t2.n and
+t1.m = t2.m where t1.n = 1;
+select t1.*, t2.* from t1 left join t2 on t1.n = t2.n and
+t1.m = t2.m where t1.n = 1 order by t1.o;
+drop table t1,t2;
+
+# Test bug with NATURAL join:
+
+CREATE TABLE t1 (id1 INT NOT NULL PRIMARY KEY, dat1 CHAR(1), id2 INT);
+INSERT INTO t1 VALUES (1,'a',1);
+INSERT INTO t1 VALUES (2,'b',1);
+INSERT INTO t1 VALUES (3,'c',2);
+
+CREATE TABLE t2 (id2 INT NOT NULL PRIMARY KEY, dat2 CHAR(1));
+INSERT INTO t2 VALUES (1,'x');
+INSERT INTO t2 VALUES (2,'y');
+INSERT INTO t2 VALUES (3,'z');
+
+SELECT t2.id2 FROM t2 LEFT OUTER JOIN t1 ON t1.id2 = t2.id2 WHERE id1 IS NULL;
+SELECT t2.id2 FROM t2 NATURAL LEFT OUTER JOIN t1 WHERE id1 IS NULL;
+
+drop table t1,t2;
+
+create table t1 ( color varchar(20), name varchar(20) );
+insert into t1 values ( 'red', 'apple' );
+insert into t1 values ( 'yellow', 'banana' );
+insert into t1 values ( 'green', 'lime' );
+insert into t1 values ( 'black', 'grape' );
+insert into t1 values ( 'blue', 'blueberry' );
+create table t2 ( count int, color varchar(20) );
+insert into t2 values (10, 'green');
+insert into t2 values (5, 'black');
+insert into t2 values (15, 'white');
+insert into t2 values (7, 'green');
+select * from t1;
+select * from t2;
+select * from t2 natural join t1;
+select t2.count, t1.name from t2 natural join t1;
+select t2.count, t1.name from t2 inner join t1 using (color);
+drop table t1;
+drop table t2;
+
+#
+# Test of LEFT JOIN + GROUP FUNCTIONS within functions:
+#
+
+CREATE TABLE t1 (
+ pcode varchar(8) DEFAULT '' NOT NULL
+);
+INSERT INTO t1 VALUES ('kvw2000'),('kvw2001'),('kvw3000'),('kvw3001'),('kvw3002'),('kvw3500'),('kvw3501'),('kvw3502'),('kvw3800'),('kvw3801'),('kvw3802'),('kvw3900'),('kvw3901'),('kvw3902'),('kvw4000'),('kvw4001'),('kvw4002'),('kvw4200'),('kvw4500'),('kvw5000'),('kvw5001'),('kvw5500'),('kvw5510'),('kvw5600'),('kvw5601'),('kvw6000'),('klw1000'),('klw1020'),('klw1500'),('klw2000'),('klw2001'),('klw2002'),('kld2000'),('klw2500'),('kmw1000'),('kmw1500'),('kmw2000'),('kmw2001'),('kmw2100'),('kmw3000'),('kmw3200');
+CREATE TABLE t2 (
+ pcode varchar(8) DEFAULT '' NOT NULL,
+ KEY pcode (pcode)
+);
+INSERT INTO t2 VALUES ('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw2000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3000'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw3500'),('kvw6000'),('kvw6000'),('kld2000');
+
+SELECT t1.pcode, IF(ISNULL(t2.pcode), 0, COUNT(*)) AS count FROM t1
+LEFT JOIN t2 ON t1.pcode = t2.pcode GROUP BY t1.pcode;
+SELECT SQL_BIG_RESULT t1.pcode, IF(ISNULL(t2.pcode), 0, COUNT(*)) AS count FROM t1 LEFT JOIN t2 ON t1.pcode = t2.pcode GROUP BY t1.pcode;
+drop table t1,t2;
+
+#
+# Another left join problem
+#
+
+CREATE TABLE t1 (
+ id int(11),
+ pid int(11),
+ rep_del tinyint(4),
+ KEY id (id),
+ KEY pid (pid)
+);
+INSERT INTO t1 VALUES (1,NULL,NULL);
+INSERT INTO t1 VALUES (2,1,NULL);
+select * from t1 LEFT JOIN t1 t2 ON (t1.id=t2.pid) AND t2.rep_del IS NULL;
+create index rep_del ON t1(rep_del);
+select * from t1 LEFT JOIN t1 t2 ON (t1.id=t2.pid) AND t2.rep_del IS NULL;
+drop table t1;
+
+CREATE TABLE t1 (
+ id int(11) DEFAULT '0' NOT NULL,
+ name tinytext DEFAULT '' NOT NULL,
+ UNIQUE id (id)
+);
+INSERT INTO t1 VALUES (1,'yes'),(2,'no');
+CREATE TABLE t2 (
+ id int(11) DEFAULT '0' NOT NULL,
+ idx int(11) DEFAULT '0' NOT NULL,
+ UNIQUE id (id,idx)
+);
+INSERT INTO t2 VALUES (1,1);
+explain SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
+SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
+drop table t1,t2;