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  • Sql Jions 的简易理解

    Sql Jions 的简易理解

    Select  * from TableA A  left jion TableB  B on  A.key = B.key

    Select  * from TableA A  right jion TableB  B on  A.key = B.key

    Select  * from TableA A inner jion TableB  B on  A.key = B.key

    Select  * from TableA A left jion TableB  B on  A.key = B.key where B.key is NULL

    Select  * from TableA A right jion TableB  B on  A.key = B.key where A.key is NULL

    Select  * from TableA A full outer jion TableB  B on  A.key = B.key

    Select  * from TableA A full outer jion TableB  B on  A.key = B.key  where A.key is NULL or B.key is NULL

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  • 原文地址:https://www.cnblogs.com/daiwei1981/p/9094658.html
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