alter_table.result
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:20k
源码类别:
MySQL数据库
开发平台:
Visual C++
- drop table if exists t1,t2;
- drop database if exists mysqltest;
- create table t1 (
- col1 int not null auto_increment primary key,
- col2 varchar(30) not null,
- col3 varchar (20) not null,
- col4 varchar(4) not null,
- col5 enum('PENDING', 'ACTIVE', 'DISABLED') not null,
- col6 int not null, to_be_deleted int);
- insert into t1 values (2,4,3,5,"PENDING",1,7);
- alter table t1
- add column col4_5 varchar(20) not null after col4,
- add column col7 varchar(30) not null after col5,
- add column col8 datetime not null, drop column to_be_deleted,
- change column col2 fourth varchar(30) not null after col3,
- modify column col6 int not null first;
- select * from t1;
- col6 col1 col3 fourth col4 col4_5 col5 col7 col8
- 1 2 3 4 5 PENDING 0000-00-00 00:00:00
- drop table t1;
- create table t1 (bandID MEDIUMINT UNSIGNED NOT NULL PRIMARY KEY, payoutID SMALLINT UNSIGNED NOT NULL);
- insert into t1 (bandID,payoutID) VALUES (1,6),(2,6),(3,4),(4,9),(5,10),(6,1),(7,12),(8,12);
- alter table t1 add column new_col int, order by payoutid,bandid;
- select * from t1;
- bandID payoutID new_col
- 6 1 NULL
- 3 4 NULL
- 1 6 NULL
- 2 6 NULL
- 4 9 NULL
- 5 10 NULL
- 7 12 NULL
- 8 12 NULL
- alter table t1 order by bandid,payoutid;
- select * from t1;
- bandID payoutID new_col
- 1 6 NULL
- 2 6 NULL
- 3 4 NULL
- 4 9 NULL
- 5 10 NULL
- 6 1 NULL
- 7 12 NULL
- 8 12 NULL
- drop table t1;
- CREATE TABLE t1 (
- GROUP_ID int(10) unsigned DEFAULT '0' NOT NULL,
- LANG_ID smallint(5) unsigned DEFAULT '0' NOT NULL,
- NAME varchar(80) DEFAULT '' NOT NULL,
- PRIMARY KEY (GROUP_ID,LANG_ID),
- KEY NAME (NAME));
- ALTER TABLE t1 CHANGE NAME NAME CHAR(80) not null;
- SHOW FULL COLUMNS FROM t1;
- Field Type Collation Null Key Default Extra Privileges Comment
- GROUP_ID int(10) unsigned NULL PRI 0 #
- LANG_ID smallint(5) unsigned NULL PRI 0 #
- NAME char(80) latin1_swedish_ci MUL #
- DROP TABLE t1;
- create table t1 (n int);
- insert into t1 values(9),(3),(12),(10);
- alter table t1 order by n;
- select * from t1;
- n
- 3
- 9
- 10
- 12
- drop table t1;
- CREATE TABLE t1 (
- id int(11) unsigned NOT NULL default '0',
- category_id tinyint(4) unsigned NOT NULL default '0',
- type_id tinyint(4) unsigned NOT NULL default '0',
- body text NOT NULL,
- user_id int(11) unsigned NOT NULL default '0',
- status enum('new','old') NOT NULL default 'new',
- PRIMARY KEY (id)
- ) ENGINE=MyISAM;
- ALTER TABLE t1 ORDER BY t1.id, t1.status, t1.type_id, t1.user_id, t1.body;
- DROP TABLE t1;
- CREATE TABLE t1 (AnamneseId int(10) unsigned NOT NULL auto_increment,B BLOB,PRIMARY KEY (AnamneseId)) engine=myisam;
- insert into t1 values (null,"hello");
- LOCK TABLES t1 WRITE;
- ALTER TABLE t1 ADD Column new_col int not null;
- UNLOCK TABLES;
- OPTIMIZE TABLE t1;
- Table Op Msg_type Msg_text
- test.t1 optimize status OK
- DROP TABLE t1;
- create table t1 (i int unsigned not null auto_increment primary key);
- insert into t1 values (null),(null),(null),(null);
- alter table t1 drop i,add i int unsigned not null auto_increment, drop primary key, add primary key (i);
- select * from t1;
- i
- 1
- 2
- 3
- 4
- drop table t1;
- create table t1 (name char(15));
- insert into t1 (name) values ("current");
- create database mysqltest;
- create table mysqltest.t1 (name char(15));
- insert into mysqltest.t1 (name) values ("mysqltest");
- select * from t1;
- name
- current
- select * from mysqltest.t1;
- name
- mysqltest
- alter table t1 rename mysqltest.t1;
- ERROR 42S01: Table 't1' already exists
- select * from t1;
- name
- current
- select * from mysqltest.t1;
- name
- mysqltest
- drop table t1;
- drop database mysqltest;
- create table t1 (n1 int not null, n2 int, n3 int, n4 float,
- unique(n1),
- key (n1, n2, n3, n4),
- key (n2, n3, n4, n1),
- key (n3, n4, n1, n2),
- key (n4, n1, n2, n3) );
- alter table t1 disable keys;
- show keys from t1;
- Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
- t1 0 n1 1 n1 A 0 NULL NULL BTREE
- t1 1 n1_2 1 n1 A NULL NULL NULL BTREE disabled
- t1 1 n1_2 2 n2 A NULL NULL NULL YES BTREE disabled
- t1 1 n1_2 3 n3 A NULL NULL NULL YES BTREE disabled
- t1 1 n1_2 4 n4 A NULL NULL NULL YES BTREE disabled
- t1 1 n2 1 n2 A NULL NULL NULL YES BTREE disabled
- t1 1 n2 2 n3 A NULL NULL NULL YES BTREE disabled
- t1 1 n2 3 n4 A NULL NULL NULL YES BTREE disabled
- t1 1 n2 4 n1 A NULL NULL NULL BTREE disabled
- t1 1 n3 1 n3 A NULL NULL NULL YES BTREE disabled
- t1 1 n3 2 n4 A NULL NULL NULL YES BTREE disabled
- t1 1 n3 3 n1 A NULL NULL NULL BTREE disabled
- t1 1 n3 4 n2 A NULL NULL NULL YES BTREE disabled
- t1 1 n4 1 n4 A NULL NULL NULL YES BTREE disabled
- t1 1 n4 2 n1 A NULL NULL NULL BTREE disabled
- t1 1 n4 3 n2 A NULL NULL NULL YES BTREE disabled
- t1 1 n4 4 n3 A NULL NULL NULL YES BTREE disabled
- insert into t1 values(10,RAND()*1000,RAND()*1000,RAND());
- insert into t1 values(9,RAND()*1000,RAND()*1000,RAND());
- insert into t1 values(8,RAND()*1000,RAND()*1000,RAND());
- insert into t1 values(7,RAND()*1000,RAND()*1000,RAND());
- insert into t1 values(6,RAND()*1000,RAND()*1000,RAND());
- insert into t1 values(5,RAND()*1000,RAND()*1000,RAND());
- insert into t1 values(4,RAND()*1000,RAND()*1000,RAND());
- insert into t1 values(3,RAND()*1000,RAND()*1000,RAND());
- insert into t1 values(2,RAND()*1000,RAND()*1000,RAND());
- insert into t1 values(1,RAND()*1000,RAND()*1000,RAND());
- alter table t1 enable keys;
- show keys from t1;
- Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
- t1 0 n1 1 n1 A 10 NULL NULL BTREE
- t1 1 n1_2 1 n1 A 10 NULL NULL BTREE
- t1 1 n1_2 2 n2 A 10 NULL NULL YES BTREE
- t1 1 n1_2 3 n3 A 10 NULL NULL YES BTREE
- t1 1 n1_2 4 n4 A 10 NULL NULL YES BTREE
- t1 1 n2 1 n2 A 10 NULL NULL YES BTREE
- t1 1 n2 2 n3 A 10 NULL NULL YES BTREE
- t1 1 n2 3 n4 A 10 NULL NULL YES BTREE
- t1 1 n2 4 n1 A 10 NULL NULL BTREE
- t1 1 n3 1 n3 A 10 NULL NULL YES BTREE
- t1 1 n3 2 n4 A 10 NULL NULL YES BTREE
- t1 1 n3 3 n1 A 10 NULL NULL BTREE
- t1 1 n3 4 n2 A 10 NULL NULL YES BTREE
- t1 1 n4 1 n4 A 10 NULL NULL YES BTREE
- t1 1 n4 2 n1 A 10 NULL NULL BTREE
- t1 1 n4 3 n2 A 10 NULL NULL YES BTREE
- t1 1 n4 4 n3 A 10 NULL NULL YES BTREE
- drop table t1;
- create table t1 (i int unsigned not null auto_increment primary key);
- alter table t1 rename t2;
- alter table t2 rename t1, add c char(10) comment "no comment";
- show columns from t1;
- Field Type Null Key Default Extra
- i int(10) unsigned PRI NULL auto_increment
- c char(10) YES NULL
- drop table t1;
- create table t1 (a int, b int);
- insert into t1 values(1,100), (2,100), (3, 100);
- insert into t1 values(1,99), (2,99), (3, 99);
- insert into t1 values(1,98), (2,98), (3, 98);
- insert into t1 values(1,97), (2,97), (3, 97);
- insert into t1 values(1,96), (2,96), (3, 96);
- insert into t1 values(1,95), (2,95), (3, 95);
- insert into t1 values(1,94), (2,94), (3, 94);
- insert into t1 values(1,93), (2,93), (3, 93);
- insert into t1 values(1,92), (2,92), (3, 92);
- insert into t1 values(1,91), (2,91), (3, 91);
- insert into t1 values(1,90), (2,90), (3, 90);
- insert into t1 values(1,89), (2,89), (3, 89);
- insert into t1 values(1,88), (2,88), (3, 88);
- insert into t1 values(1,87), (2,87), (3, 87);
- insert into t1 values(1,86), (2,86), (3, 86);
- insert into t1 values(1,85), (2,85), (3, 85);
- insert into t1 values(1,84), (2,84), (3, 84);
- insert into t1 values(1,83), (2,83), (3, 83);
- insert into t1 values(1,82), (2,82), (3, 82);
- insert into t1 values(1,81), (2,81), (3, 81);
- insert into t1 values(1,80), (2,80), (3, 80);
- insert into t1 values(1,79), (2,79), (3, 79);
- insert into t1 values(1,78), (2,78), (3, 78);
- insert into t1 values(1,77), (2,77), (3, 77);
- insert into t1 values(1,76), (2,76), (3, 76);
- insert into t1 values(1,75), (2,75), (3, 75);
- insert into t1 values(1,74), (2,74), (3, 74);
- insert into t1 values(1,73), (2,73), (3, 73);
- insert into t1 values(1,72), (2,72), (3, 72);
- insert into t1 values(1,71), (2,71), (3, 71);
- insert into t1 values(1,70), (2,70), (3, 70);
- insert into t1 values(1,69), (2,69), (3, 69);
- insert into t1 values(1,68), (2,68), (3, 68);
- insert into t1 values(1,67), (2,67), (3, 67);
- insert into t1 values(1,66), (2,66), (3, 66);
- insert into t1 values(1,65), (2,65), (3, 65);
- insert into t1 values(1,64), (2,64), (3, 64);
- insert into t1 values(1,63), (2,63), (3, 63);
- insert into t1 values(1,62), (2,62), (3, 62);
- insert into t1 values(1,61), (2,61), (3, 61);
- insert into t1 values(1,60), (2,60), (3, 60);
- insert into t1 values(1,59), (2,59), (3, 59);
- insert into t1 values(1,58), (2,58), (3, 58);
- insert into t1 values(1,57), (2,57), (3, 57);
- insert into t1 values(1,56), (2,56), (3, 56);
- insert into t1 values(1,55), (2,55), (3, 55);
- insert into t1 values(1,54), (2,54), (3, 54);
- insert into t1 values(1,53), (2,53), (3, 53);
- insert into t1 values(1,52), (2,52), (3, 52);
- insert into t1 values(1,51), (2,51), (3, 51);
- insert into t1 values(1,50), (2,50), (3, 50);
- insert into t1 values(1,49), (2,49), (3, 49);
- insert into t1 values(1,48), (2,48), (3, 48);
- insert into t1 values(1,47), (2,47), (3, 47);
- insert into t1 values(1,46), (2,46), (3, 46);
- insert into t1 values(1,45), (2,45), (3, 45);
- insert into t1 values(1,44), (2,44), (3, 44);
- insert into t1 values(1,43), (2,43), (3, 43);
- insert into t1 values(1,42), (2,42), (3, 42);
- insert into t1 values(1,41), (2,41), (3, 41);
- insert into t1 values(1,40), (2,40), (3, 40);
- insert into t1 values(1,39), (2,39), (3, 39);
- insert into t1 values(1,38), (2,38), (3, 38);
- insert into t1 values(1,37), (2,37), (3, 37);
- insert into t1 values(1,36), (2,36), (3, 36);
- insert into t1 values(1,35), (2,35), (3, 35);
- insert into t1 values(1,34), (2,34), (3, 34);
- insert into t1 values(1,33), (2,33), (3, 33);
- insert into t1 values(1,32), (2,32), (3, 32);
- insert into t1 values(1,31), (2,31), (3, 31);
- insert into t1 values(1,30), (2,30), (3, 30);
- insert into t1 values(1,29), (2,29), (3, 29);
- insert into t1 values(1,28), (2,28), (3, 28);
- insert into t1 values(1,27), (2,27), (3, 27);
- insert into t1 values(1,26), (2,26), (3, 26);
- insert into t1 values(1,25), (2,25), (3, 25);
- insert into t1 values(1,24), (2,24), (3, 24);
- insert into t1 values(1,23), (2,23), (3, 23);
- insert into t1 values(1,22), (2,22), (3, 22);
- insert into t1 values(1,21), (2,21), (3, 21);
- insert into t1 values(1,20), (2,20), (3, 20);
- insert into t1 values(1,19), (2,19), (3, 19);
- insert into t1 values(1,18), (2,18), (3, 18);
- insert into t1 values(1,17), (2,17), (3, 17);
- insert into t1 values(1,16), (2,16), (3, 16);
- insert into t1 values(1,15), (2,15), (3, 15);
- insert into t1 values(1,14), (2,14), (3, 14);
- insert into t1 values(1,13), (2,13), (3, 13);
- insert into t1 values(1,12), (2,12), (3, 12);
- insert into t1 values(1,11), (2,11), (3, 11);
- insert into t1 values(1,10), (2,10), (3, 10);
- insert into t1 values(1,9), (2,9), (3, 9);
- insert into t1 values(1,8), (2,8), (3, 8);
- insert into t1 values(1,7), (2,7), (3, 7);
- insert into t1 values(1,6), (2,6), (3, 6);
- insert into t1 values(1,5), (2,5), (3, 5);
- insert into t1 values(1,4), (2,4), (3, 4);
- insert into t1 values(1,3), (2,3), (3, 3);
- insert into t1 values(1,2), (2,2), (3, 2);
- insert into t1 values(1,1), (2,1), (3, 1);
- alter table t1 add unique (a,b), add key (b);
- show keys from t1;
- Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
- t1 0 a 1 a A NULL NULL NULL YES BTREE
- t1 0 a 2 b A NULL NULL NULL YES BTREE
- t1 1 b 1 b A 100 NULL NULL YES BTREE
- analyze table t1;
- Table Op Msg_type Msg_text
- test.t1 analyze status OK
- show keys from t1;
- Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
- t1 0 a 1 a A 3 NULL NULL YES BTREE
- t1 0 a 2 b A 300 NULL NULL YES BTREE
- t1 1 b 1 b A 100 NULL NULL YES BTREE
- drop table t1;
- CREATE TABLE t1 (i int(10), index(i) );
- ALTER TABLE t1 DISABLE KEYS;
- INSERT DELAYED INTO t1 VALUES(1),(2),(3);
- ALTER TABLE t1 ENABLE KEYS;
- drop table t1;
- CREATE TABLE t1 (
- Host varchar(16) binary NOT NULL default '',
- User varchar(16) binary NOT NULL default '',
- PRIMARY KEY (Host,User)
- ) ENGINE=MyISAM;
- ALTER TABLE t1 DISABLE KEYS;
- LOCK TABLES t1 WRITE;
- INSERT INTO t1 VALUES ('localhost','root'),('localhost',''),('games','monty');
- 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 3 NULL NULL BTREE
- ALTER TABLE t1 ENABLE KEYS;
- UNLOCK TABLES;
- CHECK TABLES t1;
- Table Op Msg_type Msg_text
- test.t1 check status OK
- DROP TABLE t1;
- CREATE TABLE t1 (
- Host varchar(16) binary NOT NULL default '',
- User varchar(16) binary NOT NULL default '',
- PRIMARY KEY (Host,User),
- KEY (Host)
- ) ENGINE=MyISAM;
- 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
- LOCK TABLES t1 WRITE;
- INSERT INTO t1 VALUES ('localhost','root'),('localhost','');
- 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 2 NULL NULL BTREE
- t1 1 Host 1 Host A NULL NULL NULL BTREE disabled
- ALTER TABLE t1 ENABLE 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 2 NULL NULL BTREE
- t1 1 Host 1 Host A 1 NULL NULL BTREE
- UNLOCK TABLES;
- CHECK TABLES t1;
- Table Op Msg_type Msg_text
- test.t1 check status OK
- LOCK TABLES t1 WRITE;
- ALTER TABLE t1 RENAME t2;
- UNLOCK TABLES;
- select * from t2;
- Host User
- localhost
- localhost root
- DROP TABLE t2;
- CREATE TABLE t1 (
- Host varchar(16) binary NOT NULL default '',
- User varchar(16) binary NOT NULL default '',
- PRIMARY KEY (Host,User),
- 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 `t1\`;
- ERROR 42000: Incorrect table name 't1\'
- rename table t1 to `t1\`;
- ERROR 42000: Incorrect table name 't1\'
- 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 default '',
- 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 default '',
- 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 9 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 9 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);
- 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 9 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 ('耘釉');
- select a,hex(a) from t1;
- a hex(a)
- 耘釉 D4C5D3D4
- alter table t1 change a a char(10) character set cp1251;
- select a,hex(a) from t1;
- a hex(a)
- 耘釉 F2E5F1F2
- alter table t1 change a a binary(10);
- select a,hex(a) from t1;
- a hex(a)
- 蝈耱 F2E5F1F2
- alter table t1 change a a char(10) character set cp1251;
- select a,hex(a) from t1;
- a hex(a)
- 耘釉 F2E5F1F2
- alter table t1 change a a char(10) character set koi8r;
- select a,hex(a) from t1;
- a hex(a)
- 耘釉 D4C5D3D4
- alter table t1 change a a varchar(10) character set cp1251;
- select a,hex(a) from t1;
- a hex(a)
- 耘釉 F2E5F1F2
- alter table t1 change a a char(10) character set koi8r;
- select a,hex(a) from t1;
- a hex(a)
- 耘釉 D4C5D3D4
- alter table t1 change a a text character set cp1251;
- select a,hex(a) from t1;
- a hex(a)
- 耘釉 F2E5F1F2
- alter table t1 change a a char(10) character set koi8r;
- select a,hex(a) from t1;
- a hex(a)
- 耘釉 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 default '0',
- `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 t1 (a text) character set koi8r;
- insert into t1 values (_koi8r'耘釉');
- 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 mysqltest1;
- create table t1 (c1 int);
- alter table t1 rename mysqltest1.t1;
- drop table t1;
- ERROR 42S02: Unknown table 't1'
- alter table mysqltest1.t1 rename t1;
- drop table t1;
- create table t1 (c1 int);
- use mysqltest1;
- drop database mysqltest1;
- alter table test.t1 rename t1;
- ERROR 3D000: No database selected
- alter table test.t1 rename test.t1;
- use test;
- drop table t1;