ALTER TABLE — 更改表屬性

語法

ALTER TABLE table [ * ]
      ADD [ COLUMN ] column type
ALTER TABLE table [ * ]
      ALTER [ COLUMN ] column { SET DEFAULT value | DROP DEFAULT }
ALTER TABLE table [ * ]
      RENAME [ COLUMN ] column TO newcolumn
ALTER TABLE table
      RENAME TO newtable
ALTER TABLE table
 
      ADD table constraint definition

用法

ALTER TABLE distributors ADD COLUMN address VARCHAR(30);

ALTER TABLE distributors RENAME COLUMN address TO city

使 用說明

ALTER TABLE user_info ADD username varchar(50) COLLATE Chinese_PRC_CI_AS NULL