如何在case语句中编写select语句

Question

让我知道如何在case语句中编写select语句。

select 
ROW_NUMBER() OVER(Order by vendor.VendorName) AS ID, 
PH.PurchasingHeaderID as BILLNo, 
PH.TotalPriceCompanyCurrency as Balance, 
acc.AccountName as [Account_Name] 
**Into #tempOpenVedorlist** 
from PurchasingHeader PH 
LEFT OUTER JOIN TransactionType Trans ON PH.TransactionTypeID =Trans.TransactionTypeID 
LEFT OUTER JOIN Vendor vendor on PH.VendorID=vendor.VendorID 
LEFT OUTER JOIN PaymentTerm PT on PT.PaymentTermID = vendor.PaymentTermID 
LEFT OUTER JOIN PurchasingDetail PD on PD.PurchasingHeaderID = PH.PurchasingHeaderI 
LEFT OUTER JOIN Account Acc on Acc.AccountID= PD.FinancialAccountID 
where PH.TransactionTypeID=7 
Group by vendor.VendorName, 
PH.PurchasingHeaderID,PH.TotalPriceCompanyCurrency,acc.AccountName 

我得到这个结果：

这个结果：在这里，我没有：VB1003两次，但帐户名称是不同的。

ID  BILLNo   Account_Name   Balance 
------------------------------------------------------------- 
101  VB1000  Cash-Petty Cash   4000.00 
102  VB1001  Accounts Receivable  5000.00 
103 VB1003  Cash-PettyCash    6000.00 
104  VB1003  Cash      6000.00 
105 VB1004  UndepositedFunds   7000.00 

在这里，我必须显示;

我需要这样的结果：

ID  BILLNo  Account_Name   Balance  
------------------------------------------------------ 
101  VB1000  Cash-PettyCash  4000.00 
102  VB1001  AccountsReceivable  5000.00 
103  VB1003  ---Multiple----  6000.00 
104  VB1004  UndepositedFunds  7000.00 

对于aboue结果是什么我已经做的：我已经采取了所有的数据在临时表。

我能够显示多个字符串拥有超过一个号

但不幸的是我不能够显示帐户名称为它只有一个BILLNo。

select ROW_NUMBER() OVER(Order by BILLNo) AS ID, 
[BILLNo], 
Balance, 
CASE 
WHEN count(BILLNo)>1 THEN 'Multipul' 
WHEN count(BILLNo)<2 THEN **(Select Account_Name from #tempOpenVedorlist)** 
End As [Financial_Account] 
from #tempOpenVedorlist 
Group By BILLNo,Balance 

请让我知道如何从临时表中获取与该BILLNo相关的帐户名称。

Answer 1

从GROUP BY中删除AccountName并在其上放置一个聚合。

SELECT ROW_NUMBER() OVER(Order by vendor.VendorName) AS ID, 
     PH.PurchasingHeaderID as BILLNo, 
     PH.TotalPriceCompanyCurrency as Balance, 
     CASE WHEN MIN(acc.AccountName) IS NULL 
      THEN '----' 
      WHEN MIN(acc.AccountName) = MAX(acc.AccountName) 
      THEN MIN(acc.AccountName) 
      ELSE '--MULTIPLE--' 
     END as [Account_Name] 
INTO #tempOpenVedorlist 
FROM PurchasingHeader PH 
     LEFT OUTER JOIN TransactionType Trans 
      ON PH.TransactionTypeID =Trans.TransactionTypeID 
     LEFT OUTER JOIN Vendor vendor 
      ON PH.VendorID=vendor.VendorID 
     LEFT OUTER JOIN PaymentTerm PT 
      ON PT.PaymentTermID = vendor.PaymentTermID 
     LEFT OUTER JOIN PurchasingDetail PD 
      ON PD.PurchasingHeaderID = PH.PurchasingHeaderI 
     LEFT OUTER JOIN Account Acc 
      ON Acc.AccountID= PD.FinancialAccountID 
WHERE PH.TransactionTypeID=7 
GROUP BY vendor.VendorName, 
     PH.PurchasingHeaderID, 
     PH.TotalPriceCompanyCurrency