Question

我有一个查询（部分内容），如下所示，当我的GridView加载此查询时，那些没有IssCount和UsedCount值的行将为空。如何为这些记录设置这些列的默认0值？

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

试试这种方式..

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

Answer 2

您可以将COALESCE包裹在X.IssCount和Y.UsedCount周围，使它们为0，如下所示：

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

使用0作为默认计数值

2 个答案: