使用 ISNULL 包装总和和计算

Question

我正在尝试用零替换此代码中的空值

SUM(ITR_TransQty * - 1)

我尝试用 ISNULL 包装它，但我仍然返回空值

ISNULL(SUM(ITR_TransQty * - 1),0)

我的代码中是否遗漏了某些内容，或者这是否无法在总和表达式中计算 b/c？

谢谢！

更新完整查询

SELECT pod.POD_ItemID, pod.POD_PurchOrderID, pod.POD_RequiredDate,    pod.POD_RequiredQty, (pod.POD_RequiredQty * item.IMA_AcctValAmt) as OrderValue, 
((item.IMA_OrderPointQty * 2) + item.IMA_OnHandQty) AS MaxOHLogic, (item.IMA_AcctValAmt * item.IMA_OnHandQty) as OnHandValue, 
item.IMA_BuyerPlanner, aa.Last90, bb.Last180  
from 
POD INNER JOIN Item on IMA_ItemID = pod.POD_ItemID
left outer join
(SELECT     ITR_ItemID AS Item, ISNULL(SUM(ITR_TransQty * - 1),0) AS Last90
FROM          dbo.ITR (NOLOCK) 
WHERE      (ITR_TransDate BETWEEN GETDATE() - 92 AND GETDATE() - 2) AND 
(ITR_TransType LIKE N'Issue' OR
ITR_TransType LIKE N'Shipment')GROUP BY ITR_ItemID) AS aa ON dbo.Item.IMA_ItemID = aa.Item 
LEFT OUTER JOIN
(SELECT     ITR_ItemID AS Item, SUM(ITR_TransQty) * - 1 AS Last180
FROM          dbo.ITR (NOLOCK) 
WHERE      (ITR_TransDate BETWEEN GETDATE() - 183 AND GETDATE() - 93) AND (ITR_TransType LIKE N'Issue' OR
ITR_TransType LIKE N'Shipment')
GROUP BY ITR_ItemID) AS bb ON dbo.Item.IMA_ItemID = bb.Item
WHERE ((Item.IMA_OrderPointQty * 2) <= item.IMA_OnHandQty) AND (pod.POD_RequiredDate >= GETDATE()-30) AND (pod.POD_RequiredDate <=
GETDATE()+90) AND (pod.POD_CompleteFlag <> 1)
order by OrderValue desc

将代码更改为 SUM(ISNULL(ITR_TransQty, 0) * - 1) 并且我仍然返回 NULL 值。我刚刚查了一下列，发现是FLOAT而不是INT，我想我需要先转换它吧？

Answer 1

使用没有问题：

ISNULL(SUM(ITR_TransQty * - 1),0)

NULL 值在聚合中被忽略，因此仅当 ITR_TransQty 的所有值都是 NULL.

时才使用 ISNULL()

您返回 NULL 值的原因是您在子查询中选择聚合，然后使用 LEFT JOIN 到达。

您需要在 SELECT 列表中使用 ISNULL() 或 COALESCE() 来删除 NULL:

    SELECT pod.POD_ItemID, pod.POD_PurchOrderID, pod.POD_RequiredDate,    pod.POD_RequiredQty, (pod.POD_RequiredQty * item.IMA_AcctValAmt) as OrderValue, 
    ((item.IMA_OrderPointQty * 2) + item.IMA_OnHandQty) AS MaxOHLogic, (item.IMA_AcctValAmt * item.IMA_OnHandQty) as OnHandValue, 
    item.IMA_BuyerPlanner
   , ISNULL(aa.Last90,0) AS Last90  
   , bb.Last180  
    FROM ...

此更改将使聚合周围的 ISNULL() 变得多余，因此您可以将其删除。

Answer 2

您需要用 ISNULL 代替外 select 中的 a.Last 90，因为您使用的是左外连接。

SELECT pod.POD_ItemID, pod.POD_PurchOrderID, pod.POD_RequiredDate,    pod.POD_RequiredQty, (pod.POD_RequiredQty * item.IMA_AcctValAmt) as OrderValue, 
((item.IMA_OrderPointQty * 2) + item.IMA_OnHandQty) AS MaxOHLogic, (item.IMA_AcctValAmt * item.IMA_OnHandQty) as OnHandValue, 
item.IMA_BuyerPlanner, ISNULL(aa.Last90, 0) AS [Last90], bb.Last180  
from 
POD INNER JOIN Item on IMA_ItemID = pod.POD_ItemID
left outer join
(SELECT     ITR_ItemID AS Item, SUM(ITR_TransQty * - 1) AS Last90
FROM          dbo.ITR (NOLOCK) 
WHERE      (ITR_TransDate BETWEEN GETDATE() - 92 AND GETDATE() - 2) AND 
(ITR_TransType LIKE N'Issue' OR
ITR_TransType LIKE N'Shipment')GROUP BY ITR_ItemID) AS aa ON dbo.Item.IMA_ItemID = aa.Item 
LEFT OUTER JOIN
(SELECT     ITR_ItemID AS Item, SUM(ITR_TransQty) * - 1 AS Last180
FROM          dbo.ITR (NOLOCK) 
WHERE      (ITR_TransDate BETWEEN GETDATE() - 183 AND GETDATE() - 93) AND (ITR_TransType LIKE N'Issue' OR
ITR_TransType LIKE N'Shipment')
GROUP BY ITR_ItemID) AS bb ON dbo.Item.IMA_ItemID = bb.Item
WHERE ((Item.IMA_OrderPointQty * 2) <= item.IMA_OnHandQty) AND (pod.POD_RequiredDate >= GETDATE()-30) AND (pod.POD_RequiredDate <=
GETDATE()+90) AND (pod.POD_CompleteFlag <> 1)
order by OrderValue desc

使用 ISNULL 包装总和和计算

Wrapping sum and calculation with ISNULL

sql

sql-server

sql-server-2008