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Create 'main' test directory and move 't' and 'r' there
This commit is contained in:
Michael Widenius
583
mysql-test/main/key.test
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583
mysql-test/main/key.test
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@ -0,0 +1,583 @@
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--disable_warnings
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drop table if exists t1,t2,t3;
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--enable_warnings
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SET SQL_WARNINGS=1;
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#
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# This failed for Elizabeth Mattijsen
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#
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CREATE TABLE t1 (
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ID CHAR(32) NOT NULL,
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name CHAR(32) NOT NULL,
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value CHAR(255),
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INDEX indexIDname (ID(8),name(8))
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) ;
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INSERT INTO t1 VALUES
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('keyword','indexdir','/export/home/local/www/database/indexes/keyword');
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INSERT INTO t1 VALUES ('keyword','urlprefix','text/ /text');
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INSERT INTO t1 VALUES ('keyword','urlmap','/text/ /');
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INSERT INTO t1 VALUES ('keyword','attr','personal employee company');
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INSERT INTO t1 VALUES
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('emailgids','indexdir','/export/home/local/www/database/indexes/emailgids');
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INSERT INTO t1 VALUES ('emailgids','urlprefix','text/ /text');
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INSERT INTO t1 VALUES ('emailgids','urlmap','/text/ /');
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INSERT INTO t1 VALUES ('emailgids','attr','personal employee company');
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SELECT value FROM t1 WHERE ID='emailgids' AND name='attr';
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drop table t1;
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#
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# Problem with many key parts and many or
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#
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CREATE TABLE t1 (
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price int(5) DEFAULT '0' NOT NULL,
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area varchar(40) DEFAULT '' NOT NULL,
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type varchar(40) DEFAULT '' NOT NULL,
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transityes enum('Y','N') DEFAULT 'Y' NOT NULL,
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shopsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
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schoolsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
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petsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
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KEY price (price,area,type,transityes,shopsyes,schoolsyes,petsyes)
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);
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INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','N','N','N','N');
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INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','N','N','N','N');
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INSERT IGNORE INTO t1 VALUES (900,'Vancouver','Shared/Roomate','','','','');
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INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
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INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
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INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
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INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
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INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
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SELECT * FROM t1 WHERE area='Vancouver' and transityes='y' and schoolsyes='y' and ( ((type='1 Bedroom' or type='Studio/Bach') and (price<=500)) or ((type='2 Bedroom') and (price<=550)) or ((type='Shared/Roomate') and (price<=300)) or ((type='Room and Board') and (price<=500)) ) and price <= 400;
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drop table t1;
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#
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# No longer a problem with primary key
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#
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CREATE TABLE t1 (program enum('signup','unique','sliding') not null, type enum('basic','sliding','signup'), sites set('mt'), PRIMARY KEY (program));
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# This no longer give an error for wrong primary key
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ALTER TABLE t1 modify program enum('signup','unique','sliding');
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drop table t1;
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#
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# Test of compressed decimal index.
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#
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CREATE TABLE t1 (
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name varchar(50) DEFAULT '' NOT NULL,
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author varchar(50) DEFAULT '' NOT NULL,
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category decimal(10,0) DEFAULT '0' NOT NULL,
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email varchar(50),
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password varchar(50),
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proxy varchar(50),
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bitmap varchar(20),
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msg varchar(255),
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urlscol varchar(127),
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urlhttp varchar(127),
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timeout decimal(10,0),
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nbcnx decimal(10,0),
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creation decimal(10,0),
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livinguntil decimal(10,0),
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lang decimal(10,0),
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type decimal(10,0),
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subcat decimal(10,0),
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subtype decimal(10,0),
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reg char(1),
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scs varchar(255),
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capacity decimal(10,0),
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userISP varchar(50),
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CCident varchar(50) DEFAULT '' NOT NULL,
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PRIMARY KEY (name,author,category)
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);
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INSERT INTO t1 VALUES
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('patnom','patauteur',0,'p.favre@cryo-networks.fr',NULL,NULL,'#p2sndnq6ae5g1u6t','essai salut','scol://195.242.78.119:patauteur.patnom',NULL,NULL,NULL,950036174,-882087474,NULL,3,0,3,'1','Pub/patnom/futur_divers.scs',NULL,'pat','CC1');
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INSERT INTO t1 VALUES
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('LeNomDeMonSite','Marc',0,'m.barilley@cryo-networks.fr',NULL,NULL,NULL,NULL,'scol://195.242.78.119:Marc.LeNomDeMonSite',NULL,NULL,NULL,950560434,-881563214,NULL,3,0,3,'1','Pub/LeNomDeMonSite/domus_hibere.scs',NULL,'Marq','CC1');
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select * from t1 where name='patnom' and author='patauteur' and category=0;
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drop table t1;
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#
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# Problem with search on partial index
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#
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create table t1
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(
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name_id int not null auto_increment,
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name blob,
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INDEX name_idx (name(5)),
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primary key (name_id)
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);
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INSERT t1 VALUES(NULL,'/');
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INSERT t1 VALUES(NULL,'[T,U]_axpby');
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SELECT * FROM t1 WHERE name='[T,U]_axpy';
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SELECT * FROM t1 WHERE name='[T,U]_axpby';
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create table t2
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(
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name_id int not null auto_increment,
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name char(255) binary,
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INDEX name_idx (name(5)),
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primary key (name_id)
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);
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INSERT t2 select * from t1;
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SELECT * FROM t2 WHERE name='[T,U]_axpy';
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SELECT * FROM t2 WHERE name='[T,U]_axpby';
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# Test possible problems with warnings in CREATE ... SELECT
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CREATE TABLE t3 SELECT * FROM t2 WHERE name='[T,U]_axpby';
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SELECT * FROM t2 WHERE name='[T,U]_axpby';
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drop table t1,t2,t3;
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#
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# Test bug with long primary key
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#
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create table t1
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(
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SEQNO numeric(12 ) not null,
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MOTYPEID numeric(12 ) not null,
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MOINSTANCEID numeric(12 ) not null,
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ATTRID numeric(12 ) not null,
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VALUE varchar(120) not null,
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primary key (SEQNO, MOTYPEID, MOINSTANCEID, ATTRID, VALUE )
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);
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INSERT INTO t1 VALUES (1, 1, 1, 1, 'a');
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INSERT INTO t1 VALUES (1, 1, 1, 1, 'b');
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--error ER_DUP_ENTRY
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INSERT INTO t1 VALUES (1, 1, 1, 1, 'a');
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drop table t1;
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#
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# Test with blob + tinyint key
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# (Failed for Greg Valure)
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#
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CREATE TABLE t1 (
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a tinytext NOT NULL,
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b tinyint(3) unsigned NOT NULL default '0',
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PRIMARY KEY (a(32),b)
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) ENGINE=MyISAM;
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INSERT INTO t1 VALUES ('a',1),('a',2);
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SELECT * FROM t1 WHERE a='a' AND b=2;
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SELECT * FROM t1 WHERE a='a' AND b in (2);
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SELECT * FROM t1 WHERE a='a' AND b in (1,2);
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drop table t1;
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#
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# Test of create key order
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#
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create table t1 (a int not null unique, b int unique, c int, d int not null primary key, key(c), e int not null unique);
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show keys from t1;
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drop table t1;
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#
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# Problem with UNIQUE() with NULL parts and auto increment
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#
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CREATE TABLE t1 (c CHAR(10) NOT NULL,i INT NOT NULL AUTO_INCREMENT,
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UNIQUE (c,i));
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INSERT IGNORE INTO t1 (c) VALUES (NULL),(NULL);
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SELECT * FROM t1;
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INSERT INTO t1 (c) VALUES ('a'),('a');
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SELECT * FROM t1;
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DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (c CHAR(10) NULL, i INT NOT NULL AUTO_INCREMENT,
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UNIQUE (c,i));
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INSERT INTO t1 (c) VALUES (NULL),(NULL);
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SELECT * FROM t1;
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INSERT INTO t1 (c) VALUES ('a'),('a');
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SELECT * FROM t1;
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drop table t1;
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#
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# longer keys
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#
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create table t1 (i int, a char(200), b text, unique (a), unique (b(300))) charset utf8;
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insert ignore t1 values (1, repeat('a',210), repeat('b', 310));
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insert ignore t1 values (2, repeat(0xD0B1,215), repeat(0xD0B1, 310));
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select i, length(a), length(b), char_length(a), char_length(b) from t1;
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select i from t1 where a=repeat(_utf8 'a',200);
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select i from t1 where a=repeat(_utf8 0xD0B1,200);
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select i from t1 where b=repeat(_utf8 'b',310);
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drop table t1;
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#
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# Test of key read with primary key (Bug #3497)
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#
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CREATE TABLE t1 (id int unsigned auto_increment, name char(50), primary key (id)) engine=myisam;
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insert into t1 (name) values ('a'), ('b'),('c'),('d'),('e'),('f'),('g');
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explain select 1 from t1 where id =2;
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explain select 1 from t1 where id =2 or id=3;
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explain select name from t1 where id =2;
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ALTER TABLE t1 DROP PRIMARY KEY, ADD INDEX (id);
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explain select 1 from t1 where id =2;
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drop table t1;
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#
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# Test of problem with key read (Bug #3666)
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#
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CREATE TABLE t1 (numeropost mediumint(8) unsigned NOT NULL default '0', numreponse int(10) unsigned NOT NULL auto_increment, PRIMARY KEY (numeropost,numreponse), UNIQUE KEY numreponse (numreponse));
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INSERT INTO t1 (numeropost,numreponse) VALUES ('1','1'),('1','2'),('2','3'),('2','4');
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SELECT numeropost FROM t1 WHERE numreponse='1';
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EXPLAIN SELECT numeropost FROM t1 WHERE numreponse='1';
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FLUSH TABLES;
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SELECT numeropost FROM t1 WHERE numreponse='1';
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drop table t1;
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#
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# UNIQUE prefix keys and multi-byte charsets
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#
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create table t1 (c varchar(30) character set utf8, t text character set utf8, unique (c(2)), unique (t(3))) engine=myisam;
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show create table t1;
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insert t1 values ('cccc', 'tttt'),
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(0xD0B1212223D0B1D0B1D0B1D0B1D0B1, 0xD0B1D0B1212223D0B1D0B1D0B1D0B1),
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(0xD0B1222123D0B1D0B1D0B1D0B1D0B1, 0xD0B1D0B1222123D0B1D0B1D0B1D0B1);
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--error ER_DUP_ENTRY
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insert t1 (c) values ('cc22');
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--error ER_DUP_ENTRY
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insert t1 (t) values ('ttt22');
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--error ER_DUP_ENTRY
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insert t1 (c) values (0xD0B1212322D0B1D0B1D0B1D0B1D0B1);
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--error ER_DUP_ENTRY
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insert t1 (t) values (0xD0B1D0B1212322D0B1D0B1D0B1D0B1);
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select c from t1 where c='cccc';
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select t from t1 where t='tttt';
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select c from t1 where c=0xD0B1212223D0B1D0B1D0B1D0B1D0B1;
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select t from t1 where t=0xD0B1D0B1212223D0B1D0B1D0B1D0B1;
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drop table t1;
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#
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# BUG#6151 - myisam index corruption
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#
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DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (
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c1 int,
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c2 varbinary(240),
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UNIQUE KEY (c1),
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KEY (c2)
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) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (1,'\Z\Z\Z\Z');
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INSERT INTO t1 VALUES (2,'\Z\Z\Z\Z\Z\Z');
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INSERT INTO t1 VALUES (3,'\Z\Z\Z\Z');
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select c1 from t1 where c2='\Z\Z\Z\Z';
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DELETE FROM t1 WHERE (c1 = 1);
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check table t1;
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select c1 from t1 where c2='\Z\Z\Z\Z';
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DELETE FROM t1 WHERE (c1 = 3);
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check table t1;
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select c1 from t1 where c2='\Z\Z\Z\Z';
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#
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# test delete of keys in a different order
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#
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truncate table t1;
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insert into t1 values(1,"aaaa"),(2,"aaab"),(3,"aaac"),(4,"aaccc");
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delete from t1 where c1=3;
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delete from t1 where c1=1;
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delete from t1 where c1=4;
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check table t1;
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drop table t1;
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#
|
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# Bug 6166: index prefix length of 0 not rejected
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#
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# this test should fail in 5.0
|
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# to fix it, remove #ifdef in
|
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# file sql_yacc.yy(key_part)
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# create dedicated error code for this and
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# and change my_printf_error() to my_error
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--error 1391
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create table t1 (c char(10), index (c(0)));
|
||||
|
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#
|
||||
# Bug #6126: Duplicate columns in keys should fail
|
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# Bug #6252: (dup)
|
||||
#
|
||||
--error 1060
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||||
create table t1 (c char(10), index (c,c));
|
||||
--error 1060
|
||||
create table t1 (c1 char(10), c2 char(10), index (c1,c2,c1));
|
||||
--error 1060
|
||||
create table t1 (c1 char(10), c2 char(10), index (c1,c1,c2));
|
||||
--error 1060
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||||
create table t1 (c1 char(10), c2 char(10), index (c2,c1,c1));
|
||||
create table t1 (c1 char(10), c2 char(10));
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--error 1060
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||||
alter table t1 add key (c1,c1);
|
||||
--error 1060
|
||||
alter table t1 add key (c2,c1,c1);
|
||||
--error 1060
|
||||
alter table t1 add key (c1,c2,c1);
|
||||
--error 1060
|
||||
alter table t1 add key (c1,c1,c2);
|
||||
drop table t1;
|
||||
|
||||
#
|
||||
# Bug#11228: DESC shows arbitrary column as "PRI"
|
||||
#
|
||||
create table t1 (
|
||||
i1 INT NOT NULL,
|
||||
i2 INT NOT NULL,
|
||||
UNIQUE i1idx (i1),
|
||||
UNIQUE i2idx (i2));
|
||||
desc t1;
|
||||
show create table t1;
|
||||
drop table t1;
|
||||
|
||||
#
|
||||
# Bug#12565 - ERROR 1034 when running simple UPDATE or DELETE
|
||||
# on large MyISAM table
|
||||
#
|
||||
create table t1 (
|
||||
c1 int,
|
||||
c2 varchar(20) not null,
|
||||
primary key (c1),
|
||||
key (c2(10))
|
||||
) engine=myisam;
|
||||
insert into t1 values (1,'');
|
||||
insert into t1 values (2,' \t\tTest String');
|
||||
insert into t1 values (3,' \n\tTest String');
|
||||
update t1 set c2 = 'New Test String' where c1 = 1;
|
||||
select * from t1;
|
||||
drop table t1;
|
||||
|
||||
#
|
||||
# If we use a partial field for a key that is actually the length of the
|
||||
# field, and we extend the field, we end up with a key that includes the
|
||||
# whole new length of the field.
|
||||
#
|
||||
create table t1 (a varchar(10), b varchar(10), key(a(10),b(10)));
|
||||
show create table t1;
|
||||
alter table t1 modify b varchar(20);
|
||||
show create table t1;
|
||||
alter table t1 modify a varchar(20);
|
||||
show create table t1;
|
||||
drop table t1;
|
||||
|
||||
#
|
||||
# Bug #11227: Incorrectly reporting 'MUL' vs. 'UNI' on varchar
|
||||
#
|
||||
create table t1 (a int not null primary key, b varchar(20) not null unique);
|
||||
desc t1;
|
||||
drop table t1;
|
||||
create table t1 (a int not null primary key, b int not null unique);
|
||||
desc t1;
|
||||
drop table t1;
|
||||
create table t1 (a int not null primary key, b varchar(20) not null, unique (b(10)));
|
||||
desc t1;
|
||||
drop table t1;
|
||||
create table t1 (a int not null primary key, b varchar(20) not null, c varchar(20) not null, unique(b(10),c(10)));
|
||||
desc t1;
|
||||
drop table t1;
|
||||
|
||||
# End of 4.1 tests
|
||||
|
||||
#
|
||||
# WL#1563 - Modify MySQL to support on-line CREATE/DROP INDEX
|
||||
# To test if this really works, you need to run with --debug
|
||||
# and check the trace file.
|
||||
#
|
||||
# Create a table with named and unnamed indexes.
|
||||
create table t1 (
|
||||
c1 int,
|
||||
c2 char(12),
|
||||
c3 varchar(123),
|
||||
c4 timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
|
||||
index (c1),
|
||||
index i1 (c1),
|
||||
index i2 (c2),
|
||||
index i3 (c3),
|
||||
unique i4 (c4),
|
||||
index i5 (c1, c2, c3, c4),
|
||||
primary key (c2, c3),
|
||||
index (c2, c4));
|
||||
show create table t1;
|
||||
# Some simple tests.
|
||||
alter table t1 drop index c1;
|
||||
alter table t1 add index (c1);
|
||||
# This creates index 'c1_2'.
|
||||
alter table t1 add index (c1);
|
||||
alter table t1 drop index i3;
|
||||
alter table t1 add index i3 (c3);
|
||||
# Two indexes at the same time.
|
||||
alter table t1 drop index i2, drop index i4;
|
||||
alter table t1 add index i2 (c2), add index i4 (c4);
|
||||
# Three indexes, one of them reversely.
|
||||
alter table t1 drop index i2, drop index i4, add index i6 (c2, c4);
|
||||
alter table t1 add index i2 (c2), add index i4 (c4), drop index i6;
|
||||
# include an unique index.
|
||||
alter table t1 drop index i2, drop index i4, add unique i4 (c4);
|
||||
alter table t1 add index i2 (c2), drop index i4, add index i4 (c4);
|
||||
# Modify an index by changing its definition.
|
||||
alter table t1 drop index c2, add index (c2(4),c3(7));
|
||||
# Change nothing. The new key definition is the same as the old one.
|
||||
alter table t1 drop index c2, add index (c2(4),c3(7));
|
||||
# Test primary key handling.
|
||||
alter table t1 add primary key (c1, c2), drop primary key;
|
||||
alter table t1 drop primary key;
|
||||
# Drop is checked first. Primary key must exist.
|
||||
--error 1091
|
||||
alter table t1 add primary key (c1, c2), drop primary key;
|
||||
show create table t1;
|
||||
# Insert non-unique values.
|
||||
insert into t1 values(1, 'a', 'a', NULL);
|
||||
insert into t1 values(1, 'b', 'b', NULL);
|
||||
# Drop some indexes for new adds.
|
||||
alter table t1 drop index i3, drop index i2, drop index i1;
|
||||
# Add indexes, one is unique on non-unique values.
|
||||
--error ER_DUP_ENTRY
|
||||
alter table t1 add index i3 (c3), add index i2 (c2), add unique index i1 (c1);
|
||||
drop table t1;
|
||||
|
||||
|
||||
#
|
||||
# Bug #20604: Test for disabled keys with aggregate functions and FORCE INDEX.
|
||||
#
|
||||
|
||||
CREATE TABLE t1( a TINYINT, KEY(a) ) ENGINE=MyISAM;
|
||||
INSERT INTO t1 VALUES( 1 );
|
||||
ALTER TABLE t1 DISABLE KEYS;
|
||||
EXPLAIN SELECT MAX(a) FROM t1 FORCE INDEX(a);
|
||||
|
||||
drop table t1;
|
||||
|
||||
#
|
||||
# Bug #24778: Innodb: No result when using ORDER BY
|
||||
#
|
||||
CREATE TABLE t1 (
|
||||
a INTEGER auto_increment PRIMARY KEY,
|
||||
b INTEGER NOT NULL,
|
||||
c INTEGER NOT NULL,
|
||||
d CHAR(64)
|
||||
);
|
||||
|
||||
CREATE TABLE t2 (
|
||||
a INTEGER auto_increment PRIMARY KEY,
|
||||
b INTEGER NOT NULL,
|
||||
c SMALLINT NOT NULL,
|
||||
d DATETIME NOT NULL,
|
||||
e SMALLINT NOT NULL,
|
||||
f INTEGER NOT NULL,
|
||||
g INTEGER NOT NULL,
|
||||
h SMALLINT NOT NULL,
|
||||
i INTEGER NOT NULL,
|
||||
j INTEGER NOT NULL,
|
||||
UNIQUE INDEX (b),
|
||||
INDEX (b, d, e, f, g, h, i, j, c),
|
||||
INDEX (c)
|
||||
);
|
||||
|
||||
INSERT INTO t2 VALUES
|
||||
(NULL, 1, 254, '1000-01-01 00:00:00', 257, 0, 0, 0, 0, 0),
|
||||
(NULL, 2, 1, '2004-11-30 12:00:00', 1, 0, 0, 0, 0, 0),
|
||||
(NULL, 3, 1, '2004-11-30 12:00:00', 1, 0, 0, 2, -21600, 0),
|
||||
(NULL, 4, 1, '2004-11-30 12:00:00', 1, 0, 0, 2, -10800, 0),
|
||||
(NULL, 5, 1, '2004-11-30 12:00:00', 1, 0, 0, 5, -10800, 0),
|
||||
(NULL, 6, 1, '2004-11-30 12:00:00', 102, 0, 0, 0, 0, 0),
|
||||
(NULL, 7, 1, '2004-11-30 12:00:00', 105, 2, 0, 0, 0, 0),
|
||||
(NULL, 8, 1, '2004-11-30 12:00:00', 105, 10, 0, 0, 0, 0);
|
||||
|
||||
INSERT INTO t1 (b, c, d) VALUES
|
||||
(3388000, -553000, NULL),
|
||||
(3388000, -553000, NULL);
|
||||
|
||||
SELECT *
|
||||
FROM t2 c JOIN t1 pa ON c.b = pa.a
|
||||
WHERE c.c = 1
|
||||
ORDER BY c.b, c.d
|
||||
;
|
||||
|
||||
DROP TABLE t1, t2;
|
||||
|
||||
#
|
||||
# Bug #31137: Assertion failed: primary_key_no == -1 || primary_key_no == 0
|
||||
#
|
||||
create table t1(a int not null, key aa(a),
|
||||
b char(10) not null, unique key bb(b(1)),
|
||||
c char(4) not null, unique key cc(c));
|
||||
desc t1;
|
||||
show create table t1;
|
||||
drop table t1;
|
||||
create table t1(a int not null, key aa(a),
|
||||
b char(10) not null, unique key bb(b(1)),
|
||||
c char(4) not null);
|
||||
desc t1;
|
||||
alter table t1 add unique key cc(c);
|
||||
desc t1;
|
||||
show create table t1;
|
||||
drop table t1;
|
||||
|
||||
--echo End of 5.0 tests
|
||||
|
||||
#
|
||||
# Bug #31148: bool close_thread_table(THD*, TABLE**): Assertion
|
||||
# `table->key_read == 0' failed.
|
||||
#
|
||||
|
||||
--disable_warnings
|
||||
DROP TABLE IF EXISTS t1;
|
||||
--enable_warnings
|
||||
|
||||
CREATE TABLE t1 (a INT PRIMARY KEY AUTO_INCREMENT);
|
||||
|
||||
INSERT INTO t1 VALUES (), (), ();
|
||||
|
||||
SELECT 1 AS c1
|
||||
FROM t1
|
||||
ORDER BY (
|
||||
SELECT 1 AS c2
|
||||
FROM t1
|
||||
GROUP BY GREATEST(LAST_INSERT_ID(), t1.a) ASC
|
||||
LIMIT 1);
|
||||
|
||||
DROP TABLE t1;
|
||||
|
||||
|
||||
#
|
||||
# Bug #31974: Wrong EXPLAIN output
|
||||
#
|
||||
|
||||
CREATE TABLE t1 (a INT, b INT, INDEX (a,b));
|
||||
INSERT INTO t1 (a, b)
|
||||
VALUES
|
||||
(1,1), (1,2), (1,3), (1,4), (1,5),
|
||||
(2,2), (2,3), (2,1), (3,1), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6);
|
||||
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE
|
||||
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
|
||||
SELECT 1 as RES FROM t1 AS t1_outer WHERE
|
||||
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
|
||||
|
||||
DROP TABLE t1;
|
||||
|
||||
--echo #
|
||||
--echo # Bug#18144: Cost with FORCE/USE index seems incorrect in some cases.
|
||||
--echo #
|
||||
--echo # We are interested in showing that the cost for the last plan is higher
|
||||
--echo # than for the preceding two plans.
|
||||
--echo #
|
||||
CREATE TABLE t1( a INT, b INT, KEY( a ) );
|
||||
INSERT INTO t1 values (1, 2), (1, 3), (2, 3), (2, 4), (3, 4), (3, 5);
|
||||
|
||||
EXPLAIN SELECT a, SUM( b ) FROM t1 GROUP BY a;
|
||||
SHOW STATUS LIKE 'Last_query_cost';
|
||||
|
||||
EXPLAIN SELECT a, SUM( b ) FROM t1 USE INDEX( a ) GROUP BY a;
|
||||
SHOW STATUS LIKE 'Last_query_cost';
|
||||
|
||||
EXPLAIN SELECT a, SUM( b ) FROM t1 FORCE INDEX( a ) GROUP BY a;
|
||||
SHOW STATUS LIKE 'Last_query_cost';
|
||||
|
||||
DROP TABLE t1;
|
||||
Reference in New Issue
Block a user