左连接的规则

by 嘉山 2017.10.16 15:52

注:脚本执行有风险,对于客户正式环境请在研发指导下执行。

以下3个sql语句效果相同

select a.* from CBO_Bank A join [CBO_BankCategory] A3 on A.[BankCategory] = A3.[ID]

select a.* from CBO_Bank A left join [CBO_BankCategory] A3 on A.[BankCategory] = A3.[ID]
where A3.Title is not null


select a.* from CBO_Bank A left join [CBO_BankCategory] A3 on A.[BankCategory] = A3.[ID]
where A3.Title >0

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评论 (2) -

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