Sql Jions 的简易理解

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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

Sql Jions 的简易理解

标签：select   分享   .com   SQ   src   ble   bsp   sql   bubuko   

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