使用 sql 中一行的值定义新列

Question

下面的代码有效

SET @SQL = '  
SELECT SC.Name AS BUYER, 
CASE WHEN PPC.FactoryName = ''ANANTA'' THEN OM.OrderQty END AS Unit1_Qty
FROM LineAllocation LA
INNER JOIN OrderMaster OM ON LA.OrderRef= OM.OrderRefID
INNER JOIN AmanOTS..FileRef FR ON FR.FileRefID = OM.FileRefID
INNER JOIN SystemManager..Contacts SC ON SC.Code=OM.BuyerCode
INNER JOIN SystemManager..ProductionProcessCostCenter PPC ON PPC.CostCenter= LA.Line
'
Exec(@sql)

但是我想要另一列作为案例条件的结果。我试过了，

CASE WHEN PPC.FactoryName = ''ANANTA'' THEN OM.OrderQty END AS Unit1_Qty,
Unit1_Qty * FR.Rate as Unit1_Value

还有这个

CASE WHEN PPC.FactoryName = ''ANANTA'' THEN OM.OrderQty END AS Unit1_Qty,
CASE WHEN PPC.FactoryName = ''ANANTA'' THEN Unit1_Qty * FR.Rate END AS Unit1_Value

但它们不起作用。我现在可以做什么？

Answer 1

不要在 SELECT 语句中引用结果字段的别名

SET @SQL = '  
SELECT SC.Name AS BUYER, 
CASE WHEN PPC.FactoryName = ''ANANTA'' THEN OM.OrderQty END AS Unit1_Qty,
-- OM.OrderQty instead of Unit1_Qty
CASE WHEN PPC.FactoryName = ''ANANTA'' THEN OM.OrderQty * FR.Rate END AS Unit1_Value 
FROM LineAllocation LA
INNER JOIN OrderMaster OM ON LA.OrderRef= OM.OrderRefID
INNER JOIN AmanOTS..FileRef FR ON FR.FileRefID = OM.FileRefID
INNER JOIN SystemManager..Contacts SC ON SC.Code=OM.BuyerCode
INNER JOIN SystemManager..ProductionProcessCostCenter PPC ON PPC.CostCenter= LA.Line
'
Exec(@sql)

使用 sql 中一行的值定义新列

Define new columns using values of a row in sql

sql

case

sql-server-2012