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;
