Sql server 2008 如何在case语句中编写select语句

让我知道如何在case语句中编写select查询

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

我得到了这个结果：

结果是：这里我有两次没有：VB1003，但帐户名不同

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  

在这里我要展示

我需要这个结果：

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   

关于结果，我所做的是：我已经获取了temp表中的所有数据

我可以显示多个具有多个编号的字符串

但不幸的是，我无法显示只有一个BILLNo的帐户名

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

选择（订单号）上方的行号（）作为ID，
[比尔诺]，
平衡，
案例
当计数（BILLNo）>1时，则为“多脉冲”
当计数（BILLNo）时，从
分组依据中删除
AccountName
，并对其进行聚合

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

如果我从Group by中删除帐户名，则会出现如下错误：“account.AccountName”列在选择列表中无效，因为它既不包含在聚合函数中，也不包含在Group by子句中。我想您需要一个
MIN（）
中的
，然后
，因为此时仍可能有多行。请立即检查。我将所有内容都包含在一个MAX中，因此它应该可以工作。
无法对包含聚合或子查询的表达式执行聚合函数。
因此我将其改为我的建议。@Damien_不信者，jyparask感谢您的回复。如果帐户名为null会怎么样。我需要显示空值，其中BillNo的帐户名为空