how to write the select statement in case statement - sql-server-2008

Question

Let me know how to write select query in case statement.
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
I GOT THIS RESULT :
with this result: Here i have No : VB1003 two times but Account Name is different.
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
Here i have to show ;
I need this result :
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
For aboue result what i have did : i have taken all the data in temp table.
Am able show Multiple string for which has more than one No.
But unfortunatly am not able show Account Name for which has only one 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
Let me know how can i get account name from temp table which is related to that BILLNo.

Answer 1

Remove the AccountName from the GROUP BY and put an aggregate on that.
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