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');
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)
#
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','C<>lculo Infinitesimal','Calcul Infinitesimal','Calcul Infinitesimal',15.0,NULL,NULL,NULL);
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
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;
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;