如何在GROUP BY的聚合SELECT中使用CASE WHEN THEN？

Question

我有一個匯總的GROUP BY查詢，在添加CASE語句之前，該查詢工作正常。 添加后，我得到此錯誤：

"Column 'gym.SalesDocumentItems.SalesDocumentItemStatusID' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause."

這是查詢：

select 
    a.AccountID, 
    isnull(sum(sdi.TotalAmount),0) AS Amount,
    isnull(sum(sdi.TotalDiscountAmount),0) AS Discount,
    isnull(sum(sdi.TaxAmount),0) AS TaxAmount, 
    isnull(sum(sdi.TaxDiscountAmount),0) AS TaxDiscountAmount, 
    isnull(sum(sdi.AmountPaid),0) AS AmountPaid,
    isnull(a.CreditAmountAvailable,0) * -1 AS Credit,
    CASE WHEN sdi.SalesDocumentItemStatusID IN(1,3) THEN
        isnull(sum(sdi.TotalAmount),0) - isnull(sum(sdi.TotalDiscountAmount),0) + isnull(sum(sdi.TaxAmount),0) - isnull(sum(sdi.TaxDiscountAmount),0) - isnull(sum(sdi.AmountPaid),0) - isnull(a.CreditAmountAvailable,0)
    ELSE
        -isnull(a.CreditAmountAvailable,0)
    END
    AS Balance,
    r.RunningBalanceTotal,
    isnull(sum(sdi.TotalAmount),0) - isnull(sum(sdi.TotalDiscountAmount),0) + isnull(sum(sdi.TaxAmount),0) - isnull(sum(sdi.TaxDiscountAmount),0) - isnull(sum(sdi.AmountPaid),0) - isnull(a.CreditAmountAvailable,0) - r.RunningBalanceTotal AS Difference,
    isnull(a.CreditAmountAvailable,0) AS AccountCredit
from gym.Account a
join gym.SalesDocument sd
on a.AccountID = sd.AccountID
join gym.SalesDocumentItems sdi
on sd.salesdocumentid = sdi.salesdocumentid
join RunningBalanceTotals r
on a.AccountID = r.AccountID
group by a.AccountID, a.CreditAmountAvailable, r.RunningBalanceTotal

我不確定如何實現這一目標。 我需要case語句，以便在不同情況下select的行為不同。 對於其中sdi.SalesDocumentItemStatusID IN（1,3）的任何記錄，我需要完整的計算； 否則，我只需要CreditAmountAvailable的負數即可。

我該如何實現？ 我正在使用MS SQL Server 2012。

[[編輯]]

這是基於以下弗蘭克查詢的修改后的查詢：

WITH ungrouped as (
    SELECT a.AccountID, 
           sdi.TotalAmount,
           CASE WHEN sdi.SalesDocumentItemStatusID IN(1,3) THEN 1 ELSE 2 END AS method,
           sdi.TaxAmount,
           sdi.TotalDiscountAmount,
           sdi.TaxDiscountAmount,
           sdi.AmountPaid,
           a.CreditAmountAvailable,
           r.RunningBalanceTotal
      from gym.Account a
      join gym.SalesDocument sd
      on a.AccountID = sd.AccountID
      join gym.SalesDocumentItems sdi
      on sd.salesdocumentid = sdi.salesdocumentid
      join RunningBalanceTotals r
      on a.AccountID = r.AccountID
)
SELECT ungrouped.AccountID, 
       CASE WHEN ungrouped.method = 1 THEN
            isnull(sum(ungrouped.TotalAmount),0) - isnull(sum(ungrouped.TotalDiscountAmount),0) + isnull(sum(ungrouped.TaxAmount),0) - isnull(sum(ungrouped.TaxDiscountAmount),0) - isnull(sum(ungrouped.AmountPaid),0) - isnull(ungrouped.CreditAmountAvailable,0)
       ELSE
            -isnull(ungrouped.CreditAmountAvailable,0)
       END AS Balance,
       ungrouped.RunningBalanceTotal,
       isnull(sum(ungrouped.TotalAmount),0) - isnull(sum(ungrouped.TotalDiscountAmount),0) + isnull(sum(ungrouped.TaxAmount),0) - isnull(sum(ungrouped.TaxDiscountAmount),0) - isnull(sum(ungrouped.AmountPaid),0) - isnull(ungrouped.CreditAmountAvailable,0) - ungrouped.RunningBalanceTotal AS Difference,
       isnull(ungrouped.CreditAmountAvailable,0) AS Credit
  FROM ungrouped
  where ungrouped.AccountID IN (    4238534,    4231337,    4132170, 4100923, 4137728, 4143255,     4230150, 4238565 
  )
GROUP BY ungrouped.AccountID, ungrouped.CreditAmountAvailable, ungrouped.RunningBalanceTotal, ungrouped.method
ORDER BY ungrouped.AccountID

Answer 1

首先獲取所有列，並包括CASE邏輯的第一部分，但不分組為CTE，我稱之為ungrouped 。 然后，進行分組並將CTE的CASE的結果包括在GROUP BY ：

    WITH ungrouped as (
    SELECT a.AccountID, 
           sdi.TotalAmount,
           CASE WHEN sdi.SalesDocumentItemStatusID IN(1,3) THEN 1 ELSE 2 END AS method,
           sdi.TaxAmount,
           sdi.TotalDiscountAmount,
           sdi.TaxDiscountAmount,
           sdi.AmountPaid,
           a.CreditAmountAvailable,
           r.RunningBalanceTotal
      from gym.Account a
      join gym.SalesDocument sd
      on a.AccountID = sd.AccountID
      join gym.SalesDocumentItems sdi
      on sd.salesdocumentid = sdi.salesdocumentid
      join RunningBalanceTotals r
      on a.AccountID = r.AccountID
)
SELECT ungrouped.AccountID, 
       isnull(sum(ungrouped.TotalAmount),0) AS Amount,
       isnull(sum(ungrouped.TotalDiscountAmount),0) AS Discount,
       isnull(sum(ungrouped.TaxAmount),0) AS TaxAmount, 
       isnull(sum(ungrouped.TaxDiscountAmount),0) AS TaxDiscountAmount, 
       isnull(sum(ungrouped.AmountPaid),0) AS AmountPaid,
       isnull(ungrouped.CreditAmountAvailable,0) * -1 AS Credit,
       CASE WHEN ungrouped.method = 1 THEN
            isnull(sum(ungrouped.TotalAmount),0) - isnull(sum(ungrouped.TotalDiscountAmount),0) + isnull(sum(ungrouped.TaxAmount),0) - isnull(sum(ungrouped.TaxDiscountAmount),0) - isnull(sum(ungrouped.AmountPaid),0) - isnull(ungrouped.CreditAmountAvailable,0)
            ELSE
                -isnull(ungrouped.CreditAmountAvailable,0)
       END AS Balance,
       ungrouped.RunningBalanceTotal,
       isnull(sum(ungrouped.TotalAmount),0) - isnull(sum(ungrouped.TotalDiscountAmount),0) + isnull(sum(ungrouped.TaxAmount),0) - isnull(sum(ungrouped.TaxDiscountAmount),0) - isnull(sum(ungrouped.AmountPaid),0) - isnull(ungrouped.CreditAmountAvailable,0) - ungrouped.RunningBalanceTotal AS Difference,
       isnull(ungrouped.CreditAmountAvailable,0) AS AccountCredit
  FROM ungrouped
GROUP BY ungrouped.AccountID, ungrouped.CreditAmountAvailable, ungrouped.RunningBalanceTotal, ungrouped.method

Answer 2

查看對原始問題的評論，我發現要求是如果sdi.SalesDocumentItemStatusID與1或3不同，則在總和中使用零。這可以通過將CASE拖到總和中來處理：

select 
    a.AccountID, 
    isnull(sum(sdi.TotalAmount),0) AS Amount,
    isnull(sum(sdi.TotalDiscountAmount),0) AS Discount,
    isnull(sum(sdi.TaxAmount),0) AS TaxAmount, 
    isnull(sum(sdi.TaxDiscountAmount),0) AS TaxDiscountAmount, 
    isnull(sum(sdi.AmountPaid),0) AS AmountPaid,
    isnull(a.CreditAmountAvailable,0) * -1 AS Credit,

      isnull(sum(CASE WHEN sdi.SalesDocumentItemStatusID IN(1,3) THEN sdi.TotalAmount ELSE 0 END),0)
    - isnull(sum(CASE WHEN sdi.SalesDocumentItemStatusID IN(1,3) THEN sdi.TotalDiscountAmount ELSE 0 END),0)
    + isnull(sum(CASE WHEN sdi.SalesDocumentItemStatusID IN(1,3) THEN sdi.TaxAmount ELSE 0 END),0)
    - isnull(sum(CASE WHEN sdi.SalesDocumentItemStatusID IN(1,3) THEN sdi.TaxDiscountAmount ELSE 0 END),0)
    - isnull(sum(CASE WHEN sdi.SalesDocumentItemStatusID IN(1,3) THEN sdi.AmountPaid ELSE 0 END),0)
    - isnull(a.CreditAmountAvailable,0)
    AS Balance,

    r.RunningBalanceTotal,
    isnull(sum(sdi.TotalAmount),0) - isnull(sum(sdi.TotalDiscountAmount),0) + isnull(sum(sdi.TaxAmount),0) - isnull(sum(sdi.TaxDiscountAmount),0) - isnull(sum(sdi.AmountPaid),0) - isnull(a.CreditAmountAvailable,0) - r.RunningBalanceTotal AS Difference,
    isnull(a.CreditAmountAvailable,0) AS AccountCredit
from gym.Account a
join gym.SalesDocument sd
on a.AccountID = sd.AccountID
join gym.SalesDocumentItems sdi
on sd.salesdocumentid = sdi.salesdocumentid
join RunningBalanceTotals r
on a.AccountID = r.AccountID
group by a.AccountID, a.CreditAmountAvailable, r.RunningBalanceTotal