有表A,B,有name,sal,deptNo1,数据更新update update A set sal=500 where name='zhangsan';(一次可更改多个值,用逗号隔开)2,数据的删除delete delete from A where name='zhangsan';(删除一行数据) delete from A where A_age between c and d;(删除c到d之间的所有数据)3,增加 insert insert into A values(id int ,