Inner join,Left join和Right join的区别
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同事突然问起来的,作为新入门的菜鸟,有什么问题就得赶紧学习。
Inner join: 返回两个表联结字段相等的行
Left join:返回左表的所有行和右表联结字段相等的行
Right join:返回右表的所有行和左表联结字段相等的行
这个比较好理解,就不举例了。
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