各种join一目了然: join 、inner join、left join 、right join、full join
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各种join一幅图一目了然
一下每幅图都是指: A * join B on A.id = B.in
这个帖子也很形象,比较好:http://www.phpddt.com/db/inner_join-outer-join.html
说明:
full join主要用来生成两个集合的并集,
inner join通常用来生成有效的数据
left join和right join使用的场景偏少。
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