ALTER TABLE student
MODIFY COLUMN update_time
timestame DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间' ;
ALTER TABLE student
MODIFY COLUMN create_time
datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间' ;
ALTER TABLE student
MODIFY COLUMN update_time
timestame DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间' ;
ALTER TABLE student
MODIFY COLUMN create_time
datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间' ;