SQL表连接查询inner join left join right join full join ...
摘要：
一、最常见的连接查询 select s.name,m.mark from student s,mark m where s.id=m.studentid. 二、内连接-inner join select s.name,m.mark from student s inner join mark m o 阅读全文
posted @ 2016-03-02 15:09 sddhome 阅读(199) 评论(0) 推荐(0) 编辑
