修改列名需要在最后加上类型

ALTER TABLE book CHANGE COLUMN publishdate pubDate DATETIME;

修改列的约束和类型

ALTER TABLE book MODIFY COLUMN pubdate TIMESTAMP;

添加新列,要加上类型

ALTER TABLE book ADD COLUMN annual DOUBLE;

删除列

ALTER TABLE author DROP COLUMN annual;
ALTER TABLE author DROP COLUMN IF EXISTS annual;

修改表名

ALTER TABLE author RENAME TO book_author;

表的删除

DROP TABLE book_author;

查看当前库的所以表

SHOW TABLES;