mysql修改表

表的結構如下:

mysql> show create table person;
| person | CREATE TABLE `person` (
  `number` int(11) DEFAULT NULL,
  `name` varchar(255) DEFAULT NULL,
  `birthday` date DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8 |

刪除列:

ALTER TABLE person DROP COLUMN birthday; 

添加列:

ALTER TABLE person ADD COLUMN birthday datetime;

修改列,把number修改為bigint:

ALTER TABLE person MODIFY number BIGINT NOT NULL;

或者是把number修改為id,類型為bigint:

ALTER TABLE person CHANGE number id BIGINT;

 

添加主鍵:

ALTER TABLE person ADD PRIMARY KEY (id);

刪除主鍵:

ALTER TABLE person DROP PRIMARY KEY;

添加唯一索引:

ALTER TABLE person ADD UNIQUE name_unique_index (`name`);

為name這一列創建了唯一索引,索引的名字是name_unique_index.

 

添加普通索引:

ALTER TABLE person ADD INDEX birthday_index (`birthday`);

 

刪除索引:

ALTER TABLE person DROP INDEX birthday_index;
ALTER TABLE person DROP INDEX name_unique_index;

 

禁用非唯一索引

ALTER TABLE person DISABLE KEYS;

ALTER TABLE...DISABLE KEYS讓MySQL停止更新MyISAM表中的非唯一索引。

激活非唯一索引

ALTER TABLE person ENABLE KEYS;

ALTER TABLE ... ENABLE KEYS重新創建丟失的索引。

 

把表默認的字符集和所有字符列（CHAR, VARCHAR, TEXT）改為新的字符集:

ALTER TABLE person CONVERT TO CHARACTER SET utf8;

修改表某一列的編碼

ALTER TABLE person CHANGE name name varchar(255) CHARACTER SET utf8;

僅僅改變一個表的默認字符集

ALTER TABLE person DEFAULT CHARACTER SET utf8;

 修改表名

RENAME TABLE person TO person_other;

移動表到其他數據庫

RENAME TABLE current_db.tbl_name TO other_db.tbl_name;