mysql alter 语句用法,添加、修改、删除字段等

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alter table tabelname add new_field_id int(5) unsigned default 0 not null auto_increment ,add primary key (new_field_id);
//增加一个新列[url=http://www.w3sky.com/]549830479[/url]

alter table t2 add d timestamp;
alter table infos add ex tinyint not null default '0';
//删除列[url=http://www.w3sky.com/]549830479[/url]

alter table t2 drop column c;
//重命名列[url=http://www.w3sky.com/]549830479[/url]

alter table t1 change a b integer;

//改变列的类型[url=http://www.w3sky.com/]549830479[/url]

alter table t1 change b b bigint not null;
alter table infos change list list tinyint not null default '0';

//重命名表[url=http://www.w3sky.com/]549830479[/url]

alter table t1 rename t2;
加索引[url=http://www.w3sky.com/]549830479[/url]

mysql> alter table tablename change depno depno int(5) not null;
mysql> alter table tablename add index 索引名 (字段名1[，字段名2 …]);
mysql> alter table tablename add index emp_name (name);
加主关键字的索引[url=http://www.w3sky.com/]549830479[/url]

mysql> alter table tablename add primary key(id);
加唯一限制条件的索引[url=http://www.w3sky.com/]549830479[/url]

mysql> alter table tablename add unique emp_name2(cardnumber);
删除某个索引[url=http://www.w3sky.com/]549830479[/url]

mysql>alter table tablename drop index emp_name;
修改表：[url=http://www.w3sky.com/]549830479[/url]

增加字段：[url=http://www.w3sky.com/]549830479[/url]

mysql> ALTER TABLE table_name ADD field_name field_type;
修改原字段名称及类型：[url=http://www.w3sky.com/]549830479[/url]

mysql> ALTER TABLE table_name CHANGE old_field_name new_field_name field_type;
删除字段：[url=http://www.w3sky.com/]549830479[/url]

mysql> ALTER TABLE table_name DROP field_name;