Question

我正在处理一个查询，希望能够在特定日期的特定时间范围内查询数据库。如果我查询一整天的数据，我会得到正确的数据。每小时可获得一行数据（0 - 23）。

WHERE Documents.CreationTime BETWEEN '2014-10-01 00:00:00.000' AND '2014-10-01 23:59:59.999'

如果我尝试查询当天的部分时间，结果就不常见了。

WHERE Documents.CreationTime BETWEEN '2014-10-01 00:00:00.000' AND '2014-10-01 06:00:00.000'

部分日查询返回:(注意小时数从0跳到19）

    Hours   Faxes   Good Page Count
    0         3       4
    19       15      58
    20        4       9
    21        8      42
    22        2       4
    23        4      12

这是我为尝试解决问题而创建的简化查询。

SELECT DATEPART(hour, DATEADD(HH, - DATEDIFF(Hour, GETDATE(), GETUTCDATE()), Documents.CreationTime)) AS Hours
    ,COUNT(*) AS Faxes
    ,SUM(goodpagecount) AS [Good Page Count]
FROM Documents
JOIN Users
    ON Documents.OwnerID = Users.handle
JOIN Groups
    ON Users.GroupID = Groups.handle
JOIN History
    ON History.OWNER = Documents.handle
JOIN HistoryTRX
    ON History.handle = HistoryTRX.handle
WHERE Documents.CreationTime BETWEEN '2014-10-01 00:00:00.000'
        AND '2014-10-01 06:00:00.000'
GROUP BY DATEPART(hour, DATEADD(HH, - DATEDIFF(Hour, GETDATE(), GETUTCDATE()), Documents.CreationTime))
ORDER BY DATEPART(hour, DATEADD(HH, - DATEDIFF(Hour, GETDATE(), GETUTCDATE()), Documents.CreationTime))

有关我缺少什么或改进的建议吗？

编辑 - 更多细节＆＃34; Documents.CreationTime＆＃34;是UTC。我期待着＃34;小时＆＃34;列对应于当地时间。在这种情况下，UTC -5作为此条目。

Answer 1

如何在where子句中使用DATEADD函数：

WHERE Documents.CreationTime >= '20141001' AND Documents.CreationTime <= DATEADD(HOUR,6,'20141001')

由Aaron Bertrand撰写的Lamak评论的有趣博客：

What do BETWEEN and the devil have in common?

Answer 2

根据回答我的问题提供的建议，我想出了以下新查询：

SELECT  DATEPART(hour, DATEADD(HH,-DATEDIFF(Hour,GETDATE(),GETUTCDATE()),Documents.CreationTime)) AS Hours ,COUNT(*) AS Faxes,SUM(goodpagecount) AS [Good Page Count]
FROM Documents
JOIN Users ON Documents.OwnerID=Users.handle
JOIN Groups ON Users.GroupID=Groups.handle
JOIN History ON History.Owner=Documents.handle
JOIN HistoryTRX ON History.handle=HistoryTRX.handle
WHERE DATEADD(HH,-DATEDIFF(Hour,GETDATE(),GETUTCDATE()),Documents.CreationTime) >= '2014-10-01 00:00:00.000' and DATEADD(HH,-DATEDIFF(Hour,GETDATE(),GETUTCDATE()),Documents.CreationTime) <= '2014-10-03 08:00:00.000'
GROUP BY  DATEPART(hour, DATEADD(HH,-DATEDIFF(Hour,GETDATE(),GETUTCDATE()),Documents.CreationTime))
ORDER BY  DATEPART(hour, DATEADD(HH,-DATEDIFF(Hour,GETDATE(),GETUTCDATE()),Documents.CreationTime))

我的更改是针对＆＃34; WHERE＆＃34;通过添加我的UTC补偿声明。＆＃34; WHERE＆＃34;现在匹配＆＃34; SELECT＆＃34;。

在：

WHERE Documents.CreationTime >= '2014-10-01 00:00:00.000' and Documents.CreationTime <= '2014-10-03 08:00:00.000'

后：

WHERE DATEADD(HH,-DATEDIFF(Hour,GETDATE(),GETUTCDATE()),Documents.CreationTime) >= '2014-10-01 00:00:00.000' and DATEADD(HH,-DATEDIFF(Hour,GETDATE(),GETUTCDATE()),Documents.CreationTime) <= '2014-10-03 08:00:00.000'

同时删除了BETWEEN关键字，因为它可能不如我想要的那样精确。

结果现在看起来像：

    Hours   Faxes   Good Page Count
      0       3      4
      1       5      9
      3       9     50
      4       8     16
      5      14     40

SQL查询未返回预期的日期时间范围

2 个答案: