SELECT --从数据库表中检索数据行和列

INSERT --向数据库表添加新数据行

DELETE --从数据库表中删除数据行

UPDATE --更新数据库表中的数据

-SELECT -- tables from the database retrieval of data rows and columns INSERT -- added to the database table OK DELETE new data -- from database tables to delete data OK UPDATE -- updating of the database table in a few According to the