SQL 外链接操作小结 inner join left join right join
简介:外部连接和自联接inner join(等值连接) 只返回两个表中联结字段相等的行left jo… Continue Reading SQL 外链接操作小结 inner join left join right join
- Posted on:
-
Author:
SilvDuke
- Categories: 数据库
- Tags: inner join, left join, right join, sql
- Leave a comment: SQL 外链接操作小结 inner join left join right join