在带有count的sql Select语句中使用CASE

Question

I am trying to execute a Select statement which includes multiple tables from a database and which has a calculated column of count added in it. I have problem adding another calculated column where I want to use CASE statement.

My code looks as follows:

SELECT     
    Customers.FirstName, Customers.LastName, Customers.PrivateNumber, 
    Branches.Name, Pawns.ID, Pawns.StartDate, Pawns.FinishDate, 
    Items.Name, Items.Mass, Items.Quantity, Pawns.CurrentSum, 
    Transactions.[Percent], Currencies.Name as Currency,
    COUNT(1) OVER (PARTITION BY Pawns.ID) AS Cnt, 
    NewDistrPrcnt = (CASE WHEN COUNT(1) OVER (PARTITION BY Pawns.ID) > '1' 
                    THEN Items.Mass/SUM(Transactions.[Percent])*Transactions.[Percent] 
                    Else Transactions.[Percent] End)  
FROM         
    Customers 
INNER JOIN
    Pawns ON Customers.ID = Pawns.CustomerID 
INNER JOIN
    Items ON Pawns.ID = Items.PawnID 
INNER JOIN
    Branches ON Pawns.BranchID = Branches.ID AND Pawns.LocationID = Branches.ID 
INNER JOIN
    PawnTypes ON Pawns.PawnTypeID = PawnTypes.ID 
INNER JOIN
    Currencies ON PawnTypes.CurrencyID = Currencies.ID 
LEFT OUTER JOIN
    Transactions ON Pawns.ID = Transactions.PawnID AND Pawns.FinishDate = Transactions.Date
WHERE     
    (Pawns.StatusID = 6) AND (Pawns.FinishDate BETWEEN '15Oct2013' AND '23Oct2013')
ORDER BY 
    Pawns.ID, Branches.Name, Pawns.FinishDate DESC

The following error is returned when I try to run the query:

Msg 8120, Level 16, State 1, Line 1
Column 'Customers.FirstName' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

Can anyone please help me in solving this issue?

Answer 1

The issue is with SUM(Transactions.[Percent]) .Replace it with window function as : (SUM(Transactions.[Percent]) over ()) and try as:

SELECT     
    Customers.FirstName, Customers.LastName, Customers.PrivateNumber, 
    Branches.Name, Pawns.ID, Pawns.StartDate, Pawns.FinishDate, 
    Items.Name, Items.Mass, Items.Quantity, Pawns.CurrentSum, 
    Transactions.[Percent], Currencies.Name as Currency,
    COUNT(1) OVER (PARTITION BY Pawns.ID) AS Cnt 
    ,NewDistrPrcnt = (CASE WHEN COUNT(1) OVER (PARTITION BY Pawns.ID) > '1' 
                          THEN Items.Mass/(SUM(Transactions.[Percent]) over ())*Transactions.[Percent] 
                          Else Transactions.[Percent] End)  
FROM         
    Customers 
INNER JOIN
    Pawns ON Customers.ID = Pawns.CustomerID 
INNER JOIN
    Items ON Pawns.ID = Items.PawnID 
INNER JOIN
    Branches ON Pawns.BranchID = Branches.ID AND Pawns.LocationID = Branches.ID 
INNER JOIN
    PawnTypes ON Pawns.PawnTypeID = PawnTypes.ID 
INNER JOIN
    Currencies ON PawnTypes.CurrencyID = Currencies.ID 
LEFT OUTER JOIN
    Transactions ON Pawns.ID = Transactions.PawnID AND Pawns.FinishDate = Transactions.[Date]
WHERE     
    (Pawns.StatusID = 6) AND (Pawns.FinishDate BETWEEN '15Oct2013' AND '23Oct2013')
ORDER BY 
    Pawns.ID, Branches.Name, Pawns.FinishDate DESC