SQL组By子句（无效列）？

我正在构建一些基本的SQL查询，并且已经在'group By'子句中脱节。我在列标题上使用了别名，但在尝试按照我的结果分组时，遇到了问题。我此刻的代码是： -SQL组By子句（无效列）？

SELECT     
    vwREP_GP_ContractProjectPurchaseCostCatID.PACOSTCATID AS COST_CAT_CODE, 
    vwREP_GP_ContractProjectPurchaseCostCatID.PACOSTCATNME AS COST_CAT_NAME, 
    vwREP_GP_ContractProjectPurchaseRpt.COST, 
    vwREP_GP_ContractProjectPurchaseRpt.ITEMDESC AS ITEM, 
    vwREP_GP_ContractProjectPurchaseRpt.CREDITOR, 
    vwREP_GP_ContractProjectPurchaseRpt.DOC_NUM AS DOCUMENT_NUMBER, 
    vwREP_GP_ContractProjectPurchaseRpt.DESCRIPTION, 
    vwREP_GP_ContractProjectPurchaseRpt.DOC_DATE AS DATE, 
    vwREP_GP_ContractProjectPurchaseRpt.PROJECT AS JOB_CODE_STAGE, 
    vwREP_GP_ContractProjectPurchaseRpt.COMPOUNDNAME AS CATEGORY_DESCRIPTION 
FROM   
    vwREP_GP_ContractProjectPurchaseCostCatID 
INNER JOIN 
    vwREP_GP_ContractProjectPurchaseRpt ON wREP_GP_ContractProjectPurchaseCostCatID.PACOSTCATID = vwREP_GP_ContractProjectPurchaseRpt.PACOSTCATID 


SELECT CATEGORY_DESCRIPTION, SUM(COST) AS TotalCost FROM 
    ( 
     SELECT COMPOUNDNAME AS CATEGORY_DESCRIPTION FROM wREP_GP_ContractProjectPurchaseRpt 
    ) A 
GROUP BY CATEGORY_DESCRIPTION

额外的代码来处理使用别名列名我现在得到一个错误，“成本”是一个无效的列已经加入？我没有改变这个列名？

我知道它明显地盯着我，但我的大脑并没有参与，所以如果任何人都可以指出我出错的地方，或者做一个简单的方法，这将是一个很大的帮助。

在此先感谢。

来源

2012-05-18 user1086159

使用

SELECT COMPOUNDNAME AS CATEGORY_DESCRIPTION, 
     Sum(COST) AS TotalCost 
FROM vwREP_GP_ContractProjectPurchaseRpt 
GROUP BY COMPOUNDNAME

代替

SELECT CATEGORY_DESCRIPTION,SUM(COST)AS TotalCost FROM 
( 
    SELECT COMPOUNDNAME AS CATEGORY_DESCRIPTION FROM vwREP_GP_ContractProjectPurchaseRpt 
) A 
GROUP BY CATEGORY_DESCRIPTION

你不包括内部查询的费用列（这是所有正在对SQL Server Management Studio中2005年完成）。

来源

2012-05-18 10:54:42

谢谢你的答案。现在工作正常。 – user1086159

SELECT CATEGORY_DESCRIPTION, SUM(COST) AS TotalCost 
FROM ( 
     SELECT COMPOUNDNAME AS CATEGORY_DESCRIPTION, COST 
     FROM vwREP_GP_ContractProjectPurchaseRpt 
     ) A 
GROUP BY 
     CATEGORY_DESCRIPTION

来源

2012-05-18 10:54:54 Quassnoi

SQL组By子句（无效列）？

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