数据库_表连接:Join
摘要:
关于联表的概念: 内联(Inner Join): SELECT * FROM A INNER JOIN B ON A.id=B.id; 左联表(Left Join): SELECT * FROM A LEFT JOIN B ON A.id=B.id; 右联表(Right Join): SELECT 阅读全文
posted @ 2020-09-15 17:31 ng机械化卡拉库里咯博透 阅读(113) 评论(0) 推荐(0) 编辑