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ad7b956922
The problem is that in a MyISAM table the following column after a varchar field gets corrupted, if varchar field is extended. This should be made to work without a copy in the future, but I'm not sure if this code is ready yet. This fix will force copy in this case. It will not do any harm to have it here, only makes alter table a bit slower in this case. If this should work for MyISAM, then the bug is somewhere else in that code. Until it works, I propose this as a temporary fix or a workaround. Test case for the bug has been added. mysql-test/r/alter_table.result: Added test case for Bug#19386: Multiple alter causes crashed table. mysql-test/t/alter_table.test: Added test case for Bug#19386: Multiple alter causes crashed table. sql/ha_myisam.cc: For MyISAM type, if varchar column is extended, it should return not compatible for now. In other words, it forces a copy of the table during alter table.
660 lines
22 KiB
Plaintext
660 lines
22 KiB
Plaintext
drop table if exists t1,t2;
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drop database if exists mysqltest;
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create table t1 (
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col1 int not null auto_increment primary key,
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col2 varchar(30) not null,
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col3 varchar (20) not null,
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col4 varchar(4) not null,
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col5 enum('PENDING', 'ACTIVE', 'DISABLED') not null,
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col6 int not null, to_be_deleted int);
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insert into t1 values (2,4,3,5,"PENDING",1,7);
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alter table t1
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add column col4_5 varchar(20) not null after col4,
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add column col7 varchar(30) not null after col5,
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add column col8 datetime not null, drop column to_be_deleted,
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change column col2 fourth varchar(30) not null after col3,
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modify column col6 int not null first;
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select * from t1;
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col6 col1 col3 fourth col4 col4_5 col5 col7 col8
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1 2 3 4 5 PENDING 0000-00-00 00:00:00
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drop table t1;
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create table t1 (bandID MEDIUMINT UNSIGNED NOT NULL PRIMARY KEY, payoutID SMALLINT UNSIGNED NOT NULL);
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insert into t1 (bandID,payoutID) VALUES (1,6),(2,6),(3,4),(4,9),(5,10),(6,1),(7,12),(8,12);
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alter table t1 add column new_col int, order by payoutid,bandid;
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select * from t1;
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bandID payoutID new_col
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6 1 NULL
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3 4 NULL
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1 6 NULL
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2 6 NULL
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4 9 NULL
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5 10 NULL
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7 12 NULL
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8 12 NULL
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alter table t1 order by bandid,payoutid;
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select * from t1;
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bandID payoutID new_col
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1 6 NULL
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2 6 NULL
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3 4 NULL
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4 9 NULL
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5 10 NULL
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6 1 NULL
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7 12 NULL
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8 12 NULL
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drop table t1;
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CREATE TABLE t1 (
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GROUP_ID int(10) unsigned DEFAULT '0' NOT NULL,
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LANG_ID smallint(5) unsigned DEFAULT '0' NOT NULL,
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NAME varchar(80) DEFAULT '' NOT NULL,
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PRIMARY KEY (GROUP_ID,LANG_ID),
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KEY NAME (NAME));
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ALTER TABLE t1 CHANGE NAME NAME CHAR(80) not null;
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SHOW FULL COLUMNS FROM t1;
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Field Type Collation Null Key Default Extra Privileges Comment
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GROUP_ID int(10) unsigned NULL NO PRI 0 #
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LANG_ID smallint(5) unsigned NULL NO PRI 0 #
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NAME char(80) latin1_swedish_ci NO MUL #
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DROP TABLE t1;
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create table t1 (n int);
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insert into t1 values(9),(3),(12),(10);
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alter table t1 order by n;
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select * from t1;
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n
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3
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9
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10
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12
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drop table t1;
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CREATE TABLE t1 (
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id int(11) unsigned NOT NULL default '0',
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category_id tinyint(4) unsigned NOT NULL default '0',
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type_id tinyint(4) unsigned NOT NULL default '0',
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body text NOT NULL,
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user_id int(11) unsigned NOT NULL default '0',
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status enum('new','old') NOT NULL default 'new',
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PRIMARY KEY (id)
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) ENGINE=MyISAM;
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ALTER TABLE t1 ORDER BY t1.id, t1.status, t1.type_id, t1.user_id, t1.body;
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DROP TABLE t1;
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CREATE TABLE t1 (AnamneseId int(10) unsigned NOT NULL auto_increment,B BLOB,PRIMARY KEY (AnamneseId)) engine=myisam;
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insert into t1 values (null,"hello");
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LOCK TABLES t1 WRITE;
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ALTER TABLE t1 ADD Column new_col int not null;
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UNLOCK TABLES;
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OPTIMIZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 optimize status OK
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DROP TABLE t1;
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create table t1 (i int unsigned not null auto_increment primary key);
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insert into t1 values (null),(null),(null),(null);
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alter table t1 drop i,add i int unsigned not null auto_increment, drop primary key, add primary key (i);
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select * from t1;
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i
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1
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2
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3
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4
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drop table t1;
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create table t1 (name char(15));
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insert into t1 (name) values ("current");
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create database mysqltest;
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create table mysqltest.t1 (name char(15));
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insert into mysqltest.t1 (name) values ("mysqltest");
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select * from t1;
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name
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current
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select * from mysqltest.t1;
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name
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mysqltest
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alter table t1 rename mysqltest.t1;
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ERROR 42S01: Table 't1' already exists
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select * from t1;
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name
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current
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select * from mysqltest.t1;
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name
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mysqltest
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drop table t1;
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drop database mysqltest;
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create table t1 (n1 int not null, n2 int, n3 int, n4 float,
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unique(n1),
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key (n1, n2, n3, n4),
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key (n2, n3, n4, n1),
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key (n3, n4, n1, n2),
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key (n4, n1, n2, n3) );
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alter table t1 disable keys;
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show keys from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 n1 1 n1 A 0 NULL NULL BTREE
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t1 1 n1_2 1 n1 A NULL NULL NULL BTREE disabled
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t1 1 n1_2 2 n2 A NULL NULL NULL YES BTREE disabled
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t1 1 n1_2 3 n3 A NULL NULL NULL YES BTREE disabled
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t1 1 n1_2 4 n4 A NULL NULL NULL YES BTREE disabled
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t1 1 n2 1 n2 A NULL NULL NULL YES BTREE disabled
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t1 1 n2 2 n3 A NULL NULL NULL YES BTREE disabled
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t1 1 n2 3 n4 A NULL NULL NULL YES BTREE disabled
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t1 1 n2 4 n1 A NULL NULL NULL BTREE disabled
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t1 1 n3 1 n3 A NULL NULL NULL YES BTREE disabled
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t1 1 n3 2 n4 A NULL NULL NULL YES BTREE disabled
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t1 1 n3 3 n1 A NULL NULL NULL BTREE disabled
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t1 1 n3 4 n2 A NULL NULL NULL YES BTREE disabled
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t1 1 n4 1 n4 A NULL NULL NULL YES BTREE disabled
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t1 1 n4 2 n1 A NULL NULL NULL BTREE disabled
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t1 1 n4 3 n2 A NULL NULL NULL YES BTREE disabled
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t1 1 n4 4 n3 A NULL NULL NULL YES BTREE disabled
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insert into t1 values(10,RAND()*1000,RAND()*1000,RAND());
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insert into t1 values(9,RAND()*1000,RAND()*1000,RAND());
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insert into t1 values(8,RAND()*1000,RAND()*1000,RAND());
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insert into t1 values(7,RAND()*1000,RAND()*1000,RAND());
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insert into t1 values(6,RAND()*1000,RAND()*1000,RAND());
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insert into t1 values(5,RAND()*1000,RAND()*1000,RAND());
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insert into t1 values(4,RAND()*1000,RAND()*1000,RAND());
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insert into t1 values(3,RAND()*1000,RAND()*1000,RAND());
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insert into t1 values(2,RAND()*1000,RAND()*1000,RAND());
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insert into t1 values(1,RAND()*1000,RAND()*1000,RAND());
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alter table t1 enable keys;
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show keys from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 n1 1 n1 A 10 NULL NULL BTREE
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t1 1 n1_2 1 n1 A 10 NULL NULL BTREE
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t1 1 n1_2 2 n2 A 10 NULL NULL YES BTREE
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t1 1 n1_2 3 n3 A 10 NULL NULL YES BTREE
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t1 1 n1_2 4 n4 A 10 NULL NULL YES BTREE
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t1 1 n2 1 n2 A 10 NULL NULL YES BTREE
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t1 1 n2 2 n3 A 10 NULL NULL YES BTREE
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t1 1 n2 3 n4 A 10 NULL NULL YES BTREE
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t1 1 n2 4 n1 A 10 NULL NULL BTREE
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t1 1 n3 1 n3 A 10 NULL NULL YES BTREE
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t1 1 n3 2 n4 A 10 NULL NULL YES BTREE
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t1 1 n3 3 n1 A 10 NULL NULL BTREE
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t1 1 n3 4 n2 A 10 NULL NULL YES BTREE
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t1 1 n4 1 n4 A 10 NULL NULL YES BTREE
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t1 1 n4 2 n1 A 10 NULL NULL BTREE
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t1 1 n4 3 n2 A 10 NULL NULL YES BTREE
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t1 1 n4 4 n3 A 10 NULL NULL YES BTREE
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drop table t1;
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create table t1 (i int unsigned not null auto_increment primary key);
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alter table t1 rename t2;
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alter table t2 rename t1, add c char(10) comment "no comment";
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show columns from t1;
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Field Type Null Key Default Extra
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i int(10) unsigned NO PRI NULL auto_increment
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c char(10) YES NULL
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drop table t1;
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create table t1 (a int, b int);
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insert into t1 values(1,100), (2,100), (3, 100);
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insert into t1 values(1,99), (2,99), (3, 99);
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insert into t1 values(1,98), (2,98), (3, 98);
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insert into t1 values(1,97), (2,97), (3, 97);
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insert into t1 values(1,96), (2,96), (3, 96);
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insert into t1 values(1,95), (2,95), (3, 95);
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insert into t1 values(1,94), (2,94), (3, 94);
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insert into t1 values(1,93), (2,93), (3, 93);
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insert into t1 values(1,92), (2,92), (3, 92);
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insert into t1 values(1,91), (2,91), (3, 91);
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insert into t1 values(1,90), (2,90), (3, 90);
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insert into t1 values(1,89), (2,89), (3, 89);
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insert into t1 values(1,88), (2,88), (3, 88);
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insert into t1 values(1,87), (2,87), (3, 87);
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insert into t1 values(1,86), (2,86), (3, 86);
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insert into t1 values(1,85), (2,85), (3, 85);
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insert into t1 values(1,84), (2,84), (3, 84);
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insert into t1 values(1,83), (2,83), (3, 83);
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insert into t1 values(1,82), (2,82), (3, 82);
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insert into t1 values(1,81), (2,81), (3, 81);
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insert into t1 values(1,80), (2,80), (3, 80);
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insert into t1 values(1,79), (2,79), (3, 79);
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insert into t1 values(1,78), (2,78), (3, 78);
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insert into t1 values(1,77), (2,77), (3, 77);
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insert into t1 values(1,76), (2,76), (3, 76);
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insert into t1 values(1,75), (2,75), (3, 75);
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insert into t1 values(1,74), (2,74), (3, 74);
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insert into t1 values(1,73), (2,73), (3, 73);
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insert into t1 values(1,72), (2,72), (3, 72);
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insert into t1 values(1,71), (2,71), (3, 71);
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insert into t1 values(1,70), (2,70), (3, 70);
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insert into t1 values(1,69), (2,69), (3, 69);
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insert into t1 values(1,68), (2,68), (3, 68);
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insert into t1 values(1,67), (2,67), (3, 67);
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insert into t1 values(1,66), (2,66), (3, 66);
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insert into t1 values(1,65), (2,65), (3, 65);
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insert into t1 values(1,64), (2,64), (3, 64);
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insert into t1 values(1,63), (2,63), (3, 63);
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insert into t1 values(1,62), (2,62), (3, 62);
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insert into t1 values(1,61), (2,61), (3, 61);
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insert into t1 values(1,60), (2,60), (3, 60);
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insert into t1 values(1,59), (2,59), (3, 59);
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insert into t1 values(1,58), (2,58), (3, 58);
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insert into t1 values(1,57), (2,57), (3, 57);
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insert into t1 values(1,56), (2,56), (3, 56);
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insert into t1 values(1,55), (2,55), (3, 55);
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insert into t1 values(1,54), (2,54), (3, 54);
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insert into t1 values(1,53), (2,53), (3, 53);
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insert into t1 values(1,52), (2,52), (3, 52);
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insert into t1 values(1,51), (2,51), (3, 51);
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insert into t1 values(1,50), (2,50), (3, 50);
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insert into t1 values(1,49), (2,49), (3, 49);
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insert into t1 values(1,48), (2,48), (3, 48);
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insert into t1 values(1,47), (2,47), (3, 47);
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insert into t1 values(1,46), (2,46), (3, 46);
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insert into t1 values(1,45), (2,45), (3, 45);
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insert into t1 values(1,44), (2,44), (3, 44);
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insert into t1 values(1,43), (2,43), (3, 43);
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insert into t1 values(1,42), (2,42), (3, 42);
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insert into t1 values(1,41), (2,41), (3, 41);
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insert into t1 values(1,40), (2,40), (3, 40);
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insert into t1 values(1,39), (2,39), (3, 39);
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insert into t1 values(1,38), (2,38), (3, 38);
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insert into t1 values(1,37), (2,37), (3, 37);
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insert into t1 values(1,36), (2,36), (3, 36);
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insert into t1 values(1,35), (2,35), (3, 35);
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insert into t1 values(1,34), (2,34), (3, 34);
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insert into t1 values(1,33), (2,33), (3, 33);
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insert into t1 values(1,32), (2,32), (3, 32);
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insert into t1 values(1,31), (2,31), (3, 31);
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insert into t1 values(1,30), (2,30), (3, 30);
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insert into t1 values(1,29), (2,29), (3, 29);
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insert into t1 values(1,28), (2,28), (3, 28);
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insert into t1 values(1,27), (2,27), (3, 27);
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insert into t1 values(1,26), (2,26), (3, 26);
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insert into t1 values(1,25), (2,25), (3, 25);
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insert into t1 values(1,24), (2,24), (3, 24);
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insert into t1 values(1,23), (2,23), (3, 23);
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insert into t1 values(1,22), (2,22), (3, 22);
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insert into t1 values(1,21), (2,21), (3, 21);
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insert into t1 values(1,20), (2,20), (3, 20);
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insert into t1 values(1,19), (2,19), (3, 19);
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insert into t1 values(1,18), (2,18), (3, 18);
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insert into t1 values(1,17), (2,17), (3, 17);
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insert into t1 values(1,16), (2,16), (3, 16);
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insert into t1 values(1,15), (2,15), (3, 15);
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insert into t1 values(1,14), (2,14), (3, 14);
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insert into t1 values(1,13), (2,13), (3, 13);
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insert into t1 values(1,12), (2,12), (3, 12);
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insert into t1 values(1,11), (2,11), (3, 11);
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insert into t1 values(1,10), (2,10), (3, 10);
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insert into t1 values(1,9), (2,9), (3, 9);
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insert into t1 values(1,8), (2,8), (3, 8);
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insert into t1 values(1,7), (2,7), (3, 7);
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insert into t1 values(1,6), (2,6), (3, 6);
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insert into t1 values(1,5), (2,5), (3, 5);
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insert into t1 values(1,4), (2,4), (3, 4);
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insert into t1 values(1,3), (2,3), (3, 3);
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insert into t1 values(1,2), (2,2), (3, 2);
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insert into t1 values(1,1), (2,1), (3, 1);
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alter table t1 add unique (a,b), add key (b);
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show keys from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 a 1 a A NULL NULL NULL YES BTREE
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t1 0 a 2 b A NULL NULL NULL YES BTREE
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t1 1 b 1 b A 100 NULL NULL YES BTREE
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analyze table t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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show keys from t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 a 1 a A 3 NULL NULL YES BTREE
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t1 0 a 2 b A 300 NULL NULL YES BTREE
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t1 1 b 1 b A 100 NULL NULL YES BTREE
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drop table t1;
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CREATE TABLE t1 (i int(10), index(i) );
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ALTER TABLE t1 DISABLE KEYS;
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INSERT DELAYED INTO t1 VALUES(1),(2),(3);
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ALTER TABLE t1 ENABLE KEYS;
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drop table t1;
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CREATE TABLE t1 (
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Host varchar(16) binary NOT NULL default '',
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User varchar(16) binary NOT NULL default '',
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PRIMARY KEY (Host,User)
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) ENGINE=MyISAM;
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ALTER TABLE t1 DISABLE KEYS;
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LOCK TABLES t1 WRITE;
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INSERT INTO t1 VALUES ('localhost','root'),('localhost',''),('games','monty');
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SHOW INDEX FROM t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 PRIMARY 1 Host A NULL NULL NULL BTREE
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t1 0 PRIMARY 2 User A 0 NULL NULL BTREE
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ALTER TABLE t1 ENABLE KEYS;
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UNLOCK TABLES;
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CHECK TABLES t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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DROP TABLE t1;
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CREATE TABLE t1 (
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Host varchar(16) binary NOT NULL default '',
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User varchar(16) binary NOT NULL default '',
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PRIMARY KEY (Host,User),
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KEY (Host)
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) ENGINE=MyISAM;
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ALTER TABLE t1 DISABLE KEYS;
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SHOW INDEX FROM t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 PRIMARY 1 Host A NULL NULL NULL BTREE
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t1 0 PRIMARY 2 User A 0 NULL NULL BTREE
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t1 1 Host 1 Host A NULL NULL NULL BTREE disabled
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LOCK TABLES t1 WRITE;
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INSERT INTO t1 VALUES ('localhost','root'),('localhost','');
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SHOW INDEX FROM t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 PRIMARY 1 Host A NULL NULL NULL BTREE
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t1 0 PRIMARY 2 User A 0 NULL NULL BTREE
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t1 1 Host 1 Host A NULL NULL NULL BTREE disabled
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ALTER TABLE t1 ENABLE KEYS;
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SHOW INDEX FROM t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 0 PRIMARY 1 Host A NULL NULL NULL BTREE
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t1 0 PRIMARY 2 User A 2 NULL NULL BTREE
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t1 1 Host 1 Host A 1 NULL NULL BTREE
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UNLOCK TABLES;
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CHECK TABLES t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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LOCK TABLES t1 WRITE;
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ALTER TABLE t1 RENAME t2;
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UNLOCK TABLES;
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select * from t2;
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Host User
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localhost
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localhost root
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DROP TABLE t2;
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CREATE TABLE t1 (
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Host varchar(16) binary NOT NULL default '',
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User varchar(16) binary NOT NULL default '',
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PRIMARY KEY (Host,User),
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KEY (Host)
|
||
) ENGINE=MyISAM;
|
||
LOCK TABLES t1 WRITE;
|
||
ALTER TABLE t1 DISABLE KEYS;
|
||
SHOW INDEX FROM t1;
|
||
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
|
||
t1 0 PRIMARY 1 Host A NULL NULL NULL BTREE
|
||
t1 0 PRIMARY 2 User A 0 NULL NULL BTREE
|
||
t1 1 Host 1 Host A NULL NULL NULL BTREE disabled
|
||
DROP TABLE t1;
|
||
create table t1 (a int);
|
||
alter table t1 rename to ``;
|
||
ERROR 42000: Incorrect table name ''
|
||
rename table t1 to ``;
|
||
ERROR 42000: Incorrect table name ''
|
||
drop table t1;
|
||
drop table if exists t1, t2;
|
||
Warnings:
|
||
Note 1051 Unknown table 't1'
|
||
Note 1051 Unknown table 't2'
|
||
create table t1 ( a varchar(10) not null primary key ) engine=myisam;
|
||
create table t2 ( a varchar(10) not null primary key ) engine=merge union=(t1);
|
||
flush tables;
|
||
alter table t1 modify a varchar(10);
|
||
show create table t2;
|
||
Table Create Table
|
||
t2 CREATE TABLE `t2` (
|
||
`a` varchar(10) NOT NULL,
|
||
PRIMARY KEY (`a`)
|
||
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 UNION=(`t1`)
|
||
flush tables;
|
||
alter table t1 modify a varchar(10) not null;
|
||
show create table t2;
|
||
Table Create Table
|
||
t2 CREATE TABLE `t2` (
|
||
`a` varchar(10) NOT NULL,
|
||
PRIMARY KEY (`a`)
|
||
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 UNION=(`t1`)
|
||
drop table if exists t1, t2;
|
||
create table t1 (a int, b int, c int, d int, e int, f int, g int, h int,i int, primary key (a,b,c,d,e,f,g,i,h)) engine=MyISAM;
|
||
insert into t1 (a) values(1);
|
||
show table status like 't1';
|
||
Name Engine Version Row_format Rows Avg_row_length Data_length Max_data_length Index_length Data_free Auto_increment Create_time Update_time Check_time Collation Checksum Create_options Comment
|
||
t1 MyISAM 10 Fixed 1 37 X X X X X X X X latin1_swedish_ci NULL
|
||
alter table t1 modify a int;
|
||
show table status like 't1';
|
||
Name Engine Version Row_format Rows Avg_row_length Data_length Max_data_length Index_length Data_free Auto_increment Create_time Update_time Check_time Collation Checksum Create_options Comment
|
||
t1 MyISAM 10 Fixed 1 37 X X X X X X X X latin1_swedish_ci NULL
|
||
drop table t1;
|
||
create table t1 (a int not null, b int not null, c int not null, d int not null, e int not null, f int not null, g int not null, h int not null,i int not null, primary key (a,b,c,d,e,f,g,i,h)) engine=MyISAM;
|
||
insert into t1 (a) values(1);
|
||
Warnings:
|
||
Warning 1364 Field 'b' doesn't have a default value
|
||
Warning 1364 Field 'c' doesn't have a default value
|
||
Warning 1364 Field 'd' doesn't have a default value
|
||
Warning 1364 Field 'e' doesn't have a default value
|
||
Warning 1364 Field 'f' doesn't have a default value
|
||
Warning 1364 Field 'g' doesn't have a default value
|
||
Warning 1364 Field 'h' doesn't have a default value
|
||
Warning 1364 Field 'i' doesn't have a default value
|
||
show table status like 't1';
|
||
Name Engine Version Row_format Rows Avg_row_length Data_length Max_data_length Index_length Data_free Auto_increment Create_time Update_time Check_time Collation Checksum Create_options Comment
|
||
t1 MyISAM 10 Fixed 1 37 X X X X X X X X latin1_swedish_ci NULL
|
||
drop table t1;
|
||
set names koi8r;
|
||
create table t1 (a char(10) character set koi8r);
|
||
insert into t1 values ('<27><><EFBFBD><EFBFBD>');
|
||
select a,hex(a) from t1;
|
||
a hex(a)
|
||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> D4C5D3D4
|
||
alter table t1 change a a char(10) character set cp1251;
|
||
select a,hex(a) from t1;
|
||
a hex(a)
|
||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> F2E5F1F2
|
||
alter table t1 change a a binary(4);
|
||
select a,hex(a) from t1;
|
||
a hex(a)
|
||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> F2E5F1F2
|
||
alter table t1 change a a char(10) character set cp1251;
|
||
select a,hex(a) from t1;
|
||
a hex(a)
|
||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> F2E5F1F2
|
||
alter table t1 change a a char(10) character set koi8r;
|
||
select a,hex(a) from t1;
|
||
a hex(a)
|
||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> D4C5D3D4
|
||
alter table t1 change a a varchar(10) character set cp1251;
|
||
select a,hex(a) from t1;
|
||
a hex(a)
|
||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> F2E5F1F2
|
||
alter table t1 change a a char(10) character set koi8r;
|
||
select a,hex(a) from t1;
|
||
a hex(a)
|
||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> D4C5D3D4
|
||
alter table t1 change a a text character set cp1251;
|
||
select a,hex(a) from t1;
|
||
a hex(a)
|
||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> F2E5F1F2
|
||
alter table t1 change a a char(10) character set koi8r;
|
||
select a,hex(a) from t1;
|
||
a hex(a)
|
||
<EFBFBD><EFBFBD><EFBFBD><EFBFBD> D4C5D3D4
|
||
delete from t1;
|
||
show create table t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`a` char(10) CHARACTER SET koi8r DEFAULT NULL
|
||
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
||
alter table t1 DEFAULT CHARACTER SET latin1;
|
||
show create table t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`a` char(10) CHARACTER SET koi8r DEFAULT NULL
|
||
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
||
alter table t1 CONVERT TO CHARACTER SET latin1;
|
||
show create table t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`a` char(10) DEFAULT NULL
|
||
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
||
alter table t1 DEFAULT CHARACTER SET cp1251;
|
||
show create table t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`a` char(10) CHARACTER SET latin1 DEFAULT NULL
|
||
) ENGINE=MyISAM DEFAULT CHARSET=cp1251
|
||
drop table t1;
|
||
create table t1 (myblob longblob,mytext longtext)
|
||
default charset latin1 collate latin1_general_cs;
|
||
show create table t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`myblob` longblob,
|
||
`mytext` longtext COLLATE latin1_general_cs
|
||
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_cs
|
||
alter table t1 character set latin2;
|
||
show create table t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`myblob` longblob,
|
||
`mytext` longtext CHARACTER SET latin1 COLLATE latin1_general_cs
|
||
) ENGINE=MyISAM DEFAULT CHARSET=latin2
|
||
drop table t1;
|
||
CREATE TABLE t1 (a int PRIMARY KEY, b INT UNIQUE);
|
||
ALTER TABLE t1 DROP PRIMARY KEY;
|
||
SHOW CREATE TABLE t1;
|
||
Table Create Table
|
||
t1 CREATE TABLE `t1` (
|
||
`a` int(11) NOT NULL,
|
||
`b` int(11) DEFAULT NULL,
|
||
UNIQUE KEY `b` (`b`)
|
||
) ENGINE=MyISAM DEFAULT CHARSET=latin1
|
||
ALTER TABLE t1 DROP PRIMARY KEY;
|
||
ERROR 42000: Can't DROP 'PRIMARY'; check that column/key exists
|
||
DROP TABLE t1;
|
||
create table t1 (a int, b int, key(a));
|
||
insert into t1 values (1,1), (2,2);
|
||
alter table t1 drop key no_such_key;
|
||
ERROR 42000: Can't DROP 'no_such_key'; check that column/key exists
|
||
alter table t1 drop key a;
|
||
drop table t1;
|
||
CREATE TABLE T12207(a int) ENGINE=MYISAM;
|
||
ALTER TABLE T12207 DISCARD TABLESPACE;
|
||
ERROR HY000: Table storage engine for 'T12207' doesn't have this option
|
||
DROP TABLE T12207;
|
||
create table t1 (a text) character set koi8r;
|
||
insert into t1 values (_koi8r'<27><><EFBFBD><EFBFBD>');
|
||
select hex(a) from t1;
|
||
hex(a)
|
||
D4C5D3D4
|
||
alter table t1 convert to character set cp1251;
|
||
select hex(a) from t1;
|
||
hex(a)
|
||
F2E5F1F2
|
||
drop table t1;
|
||
create table t1 ( a timestamp );
|
||
alter table t1 add unique ( a(1) );
|
||
ERROR HY000: Incorrect sub part key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique sub keys
|
||
drop table t1;
|
||
create database mysqltest;
|
||
create table t1 (c1 int);
|
||
alter table t1 rename mysqltest.t1;
|
||
drop table t1;
|
||
ERROR 42S02: Unknown table 't1'
|
||
alter table mysqltest.t1 rename t1;
|
||
drop table t1;
|
||
create table t1 (c1 int);
|
||
use mysqltest;
|
||
drop database mysqltest;
|
||
alter table test.t1 rename t1;
|
||
ERROR 3D000: No database selected
|
||
alter table test.t1 rename test.t1;
|
||
use test;
|
||
drop table t1;
|
||
create table t1 (mycol int(10) not null);
|
||
alter table t1 alter column mycol set default 0;
|
||
desc t1;
|
||
Field Type Null Key Default Extra
|
||
mycol int(10) NO 0
|
||
drop table t1;
|
||
create table t1 (v varchar(32));
|
||
insert into t1 values ('def'),('abc'),('hij'),('3r4f');
|
||
select * from t1;
|
||
v
|
||
def
|
||
abc
|
||
hij
|
||
3r4f
|
||
alter table t1 change v v2 varchar(32);
|
||
select * from t1;
|
||
v2
|
||
def
|
||
abc
|
||
hij
|
||
3r4f
|
||
alter table t1 change v2 v varchar(64);
|
||
select * from t1;
|
||
v
|
||
def
|
||
abc
|
||
hij
|
||
3r4f
|
||
update t1 set v = 'lmn' where v = 'hij';
|
||
select * from t1;
|
||
v
|
||
def
|
||
abc
|
||
lmn
|
||
3r4f
|
||
alter table t1 add i int auto_increment not null primary key first;
|
||
select * from t1;
|
||
i v
|
||
1 def
|
||
2 abc
|
||
3 lmn
|
||
4 3r4f
|
||
update t1 set i=5 where i=3;
|
||
select * from t1;
|
||
i v
|
||
1 def
|
||
2 abc
|
||
5 lmn
|
||
4 3r4f
|
||
alter table t1 change i i bigint;
|
||
select * from t1;
|
||
i v
|
||
1 def
|
||
2 abc
|
||
5 lmn
|
||
4 3r4f
|
||
alter table t1 add unique key (i, v);
|
||
select * from t1 where i between 2 and 4 and v in ('def','3r4f','lmn');
|
||
i v
|
||
4 3r4f
|
||
drop table t1;
|
||
create table t1 (t varchar(255) default null, key t (t(80)))
|
||
engine=myisam default charset=latin1;
|
||
alter table t1 change t t text;
|
||
drop table t1;
|
||
CREATE TABLE t1 (s CHAR(8) BINARY);
|
||
INSERT INTO t1 VALUES ('test');
|
||
SELECT LENGTH(s) FROM t1;
|
||
LENGTH(s)
|
||
4
|
||
ALTER TABLE t1 MODIFY s CHAR(10) BINARY;
|
||
SELECT LENGTH(s) FROM t1;
|
||
LENGTH(s)
|
||
4
|
||
DROP TABLE t1;
|
||
CREATE TABLE t1 (s BINARY(8));
|
||
INSERT INTO t1 VALUES ('test');
|
||
SELECT LENGTH(s) FROM t1;
|
||
LENGTH(s)
|
||
8
|
||
SELECT HEX(s) FROM t1;
|
||
HEX(s)
|
||
7465737400000000
|
||
ALTER TABLE t1 MODIFY s BINARY(10);
|
||
SELECT HEX(s) FROM t1;
|
||
HEX(s)
|
||
74657374000000000000
|
||
SELECT LENGTH(s) FROM t1;
|
||
LENGTH(s)
|
||
10
|
||
DROP TABLE t1;
|
||
CREATE TABLE t1 (v VARCHAR(3), b INT);
|
||
INSERT INTO t1 VALUES ('abc', 5);
|
||
SELECT * FROM t1;
|
||
v b
|
||
abc 5
|
||
ALTER TABLE t1 MODIFY COLUMN v VARCHAR(4);
|
||
SELECT * FROM t1;
|
||
v b
|
||
abc 5
|
||
DROP TABLE t1;
|