mysql修改数据表结构(七)

添加字段：

ALTER TABLE student
ADD address VARCHAR(200) NOT NULL,
ADD home_tel CHAR(11) NOT NULL;

修改字段约束：

ALTER TABLE student
MODIFY home_tel CHAR(20) NOT NULL;

修改字段名称：

ALTER TABLE student
CHANGE address home_address VARCHAR(200) NOT NULL;

删除字段：

ALTER TABLE student
DROP home_address,
DROP home_tel;