SQL where条件和jion on条件的详解及区别
人气:0这篇文章主要介绍了SQL where条件和jion on条件的详解及区别的相关资料,这里举例说明该如何区分,需要的朋友可以参考下
sql 语句中where条件和jion on条件的区别
与有很大的差别,请注意!
SELECT TBL_SchemaDetail.MaterialNo, TBL_StockMaterial.SalePrice FROM TBL_StockMaterial RIGHT OUTER JOIN TBL_SchemaDetail ON TBL_StockMaterial.MaterialNo = TBL_SchemaDetail.MaterialNo AND TBL_SchemaDetail.SchemaNo = '7411' AND TBL_StockMaterial.SalePrice = 0
条件全部放到join的on中。
SELECT TBL_SchemaDetail.MaterialNo, TBL_StockMaterial.SalePrice FROM TBL_StockMaterial RIGHT OUTER JOIN TBL_SchemaDetail ON TBL_StockMaterial.MaterialNo = TBL_SchemaDetail.MaterialNo WHERE (TBL_SchemaDetail.SchemaNo = '7411') AND (TBL_StockMaterial.SalePrice = 0)
连接和条件分开。
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