Question

I have a query (portion of it) like this below, when my GridView is loaded with this query, those rows that has got no value for IssCount and UsedCount will be blank. How can I set a default 0 value for these columns for such records?

SELECT
    CASE
    WHEN @SortByTypeCode = 1 THEN ROW_NUMBER() OVER(ORDER BY vt.Code)
    WHEN @SortByTypeName = 1 THEN ROW_NUMBER() OVER(ORDER BY vt.Name)               
    WHEN @SortByTypeIssued = 1 THEN ROW_NUMBER() OVER(ORDER BY count(X.IssCount))
    WHEN @SortByTypeUsed = 1 THEN ROW_NUMBER() OVER(ORDER BY count(Y.UsedCount ))
    ELSE ROW_NUMBER() OVER(ORDER BY vt.AutoID)
    END AS RowNum
    ,vt.AutoID
    ,vt.Code
    ,X.IssCount as Issued
    ,Y.UsedCount as Used
INTO #tmp_Results --Dont Change This
FROM VoucherType vt
LEFT JOIN (
    SELECT VoucherType_AutoID,COUNT(VoucherNo) IssCount
    FROM Voucher
    WHERE VoidedBy IS NULL AND VoidedOn IS NULL 
    GROUP BY VoucherType_AutoID     
) X ON vt.AutoID = X.VoucherType_AutoID
LEFT JOIN (
    SELECT V.VoucherType_AutoID, COUNT(VUsed.AutoID) UsedCount
    FROM voucherUsedLog VUsed
    INNER JOIN Voucher V ON VUsed.Voucher_AutoID = V.AutoID
    WHERE VUsed.VoidedBy IS NULL AND VUsed.VoidedOn IS NULL
    GROUP BY V.VoucherType_AutoID
) Y
ON vt.AutoID = Y.VoucherType_AutoID 

Answer 1

You can just wrap a COALESCE around X.IssCount and Y.UsedCount to make them 0, like so:

,COALESCE(X.IssCount,0) as Issued
,COALESCE(Y.UsedCount,0) as Used