SQL where条件和jion on的区别在哪?

SQL where条件和jion on的区别在哪?

sql 语句中where条件和jionon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。

感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!