sql语句与数据库2

增加数据

insert into wyx(xh,nl,xb,sfzh,zcrq)values(0422,28,男，210623198711111111,2016-8-19);

删除数据

delete from wyx where name=();

修改数据

update 表名 set name='liudehua' where 条件

查询数据

select distinct xm,xb count(*) from 表名 where xh in () and name not in () group by bj having count (*)>5 order by xm desc limit(0,5);

select * from A inner join B on A.xh=B.xh inner join C on C.xh=B.xh where 条件;

select * from A left join B on A.xh=B.xh where 条件;

select * from A right join B on A.xh=B.xh where 条件;