Question

在下面的查询中，我试图根据当前日期和上一个日期得到数量的总和。在我的情况下，它不工作它显示null但值存在于表中。我预期的结果是

Quantity | Date
200      | 20-5-2015
15       | 19-5-2015

Select SUM(RecommentedQuantity) FROM IndentDetails ID
LEFT OUTER JOIN Indent I On I.IndentID=ID.IndentID
WHERE ID.CreatedOn =GETDATE()
UNION

Select SUM(RecommentedQuantity) FROM IndentDetails ID
LEFT OUTER JOIN Indent I On I.IndentID=ID.IndentID
WHERE ID.CreatedOn =       dateadd(d, datediff(d, 0, GETDATE())-1, 0)

Answer 1

尝试此查询：

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Answer 2

您获得NULL的原因是因为在您的WHERE子句ID.CreatedOn =GETDATE()中，GETDATE()和CreatedOn都有一个不匹配的时间组件。

您可以像这样重写您的查询。

Select SUM(RecommentedQuantity) FROM IndentDetails ID
LEFT OUTER JOIN Indent I On I.IndentID=ID.IndentID
WHERE ID.CreatedOn >= CONVERT(DATE,GETDATE()) AND ID.CreatedOn < CONVERT(DATE,DATEADD(D,1,GETDATE()))
UNION

Select SUM(RecommentedQuantity) FROM IndentDetails ID
LEFT OUTER JOIN Indent I On I.IndentID=ID.IndentID
    WHERE ID.CreatedOn >= CONVERT(DATE,DATEADD(D,-1,GETDATE())) AND ID.CreatedOn < CONVERT(DATE,GETDATE())

或单个查询

Select CONVERT(DATE,ID.CreatedOn),SUM(RecommentedQuantity)
FROM IndentDetails ID
LEFT OUTER JOIN Indent I On I.IndentID=ID.IndentID
WHERE ID.CreatedOn >= CONVERT(DATE,DATEADD(D,-1,GETDATE())) AND ID.CreatedOn < CONVERT(DATE,DATEADD(D,1,GETDATE()))
GROUP BY CONVERT(DATE,ID.CreatedOn)

如果您使用的是SQL Server 2005，则可以使用CONVERT(VARCHAR(10),ID.CreatedOn,112)代替CONVERT(DATE,ID.CreatedOn)

根据当前日期和上一个日期显示数量之和

2 个答案: