报告存储过程 - 如何避免重复？

我在写报告存储过程。我想获得未确认和非开票采购订单的数量，并可以（可选）在CustomerID上过滤。报告存储过程 - 如何避免重复？

我在下面的工作如预期，但我担心，a）它很慢，b）WHERE条款的CustomerID部分有重复。

你会如何编写这个存储过程，堆栈溢出？

SELECT 
    (SELECT COUNT(*) 
    FROM PurchaseOrder 
    WHERE AcknowledgmentStatus <> 'Complete' 
    AND (@CustID = 0 OR CustomerID = @CustID) 
) AS NonAckd, 
    (SELECT COUNT(*) 
    FROM PurchaseOrder 
    WHERE InvoiceStatus <> 'Complete' 
    AND (@CustID = 0 OR CustomerID = @CustID) 
) AS NonInvoiced

来源

2010-01-26 Matt Grande

像这样的东西（从[累]内存未经）：

SELECT Sum(Case When AcknowledgmentStatus <> 'Complete' Then 1 ELSE 0 END) as NonAckd 
     ,Sum(Case When InvoiceStatus <> 'Complete'  Then 1 ELSE 0 END) as NonInvoiced 
    FROM PurchaseOrder 
WHERE CustomerID = IsNull(NullIf(@CustID, 0), CustomerID)

来源

2010-01-26 18:37:57

这就是我一直在寻找的东西！我不敢相信我从未见过'CASE WHEN'结构。 – 2010-01-26 18:45:22

我不是100％肯定你是什么后，但你可以如下简化客户的部分：

set @custID = nullif(@custID,0) 

SELECT 
    (SELECT COUNT(*) 
    FROM PurchaseOrder 
    WHERE AcknowledgmentStatus <> 'Complete' 
    AND (CustomerID = isnull(@CustID,CustomerID)) 
) AS NonAckd, 
    (SELECT COUNT(*) 
    FROM PurchaseOrder 
    WHERE InvoiceStatus <> 'Complete' 
    AND (CustomerID = isnull(@CustID,CustomerID)) 
) AS NonInvoiced

来源

2010-01-26 18:35:26 feihtthief

我认为他想摆脱重复代码的太... – 2010-01-26 18:38:57

用好NULLIF的，谢谢。我会将其添加到我的最终处理程序中。 – 2010-01-26 18:46:05

不能使用：

COUNT，因为它会凑NT所有行（1或0不是空，因此它计数它们）
COUNT DISTINCT会给2（只值1和0）

如果删除状态检查它将运行，如果你当然更快可以处理零。

SELECT 
    CASE WHEN AcknowledgmentStatus <> 'Complete' THEN 1 ELSE 0 END AS NonAckd, 
    CASE WHEN InvoiceStatus <> 'Complete' THEN 1 ELSE 0 END AS NonInvoiced, 
FROM 
    PurchaseOrder 
WHERE 
    (AcknowledgmentStatus <> 'Complete' OR InvoiceStatus <> 'Complete') --optional 
    AND 
    (@CustID = 0 OR CustomerID = @CustID)

来源

2010-01-26 18:49:21 gbn

报告存储过程 - 如何避免重复？

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