从 DateDiff 将 int 更改为 Time答案

【问题标题】：Changing int to Time from a DateDiff从 DateDiff 将 int 更改为 Time
【发布时间】：2013-11-27 14:08:57
【问题描述】：

我有 3 次要放在条形图上，但我不知道如何将 AvgUserSegmentTime 更改为时间格式 (00:00:00.00)。现在我得到 Fastest = 00:00:00.01 Slowest = 00:00:24:22.22 和 Avg = 61，这意味着条形图上的平均值要大得多。关于如何将 int 更改为时间的任何想法？

SELECT  FastestSegmentTime , SlowestSegmentTime,  
 (SELECT AVG(DateDiff(SECOND, tblTrace.trStart , tblTrace.trFinish)) 
    FROM tblTrace
   INNER JOIN 
         tblUsers 
      ON usrID = tr_usrID
   WHERE tblTrace.trFinish IS NOT NULL 
     AND tblTrace.trObjectType LIKE 'Segment%' 
     AND tblTrace.tr_vnuID = @vnuID 
     AND tblTrace.trStart BETWEEN @StartDate AND @EndDate 
     AND tblUsers.usrEmail NOT LIKE '%@test%' ) as AvgSegmentTime
    FROM ( 
      SELECT MIN(CAST(tblTrace.trFinish - tblTrace.trStart AS TIME(2))) AS FastestSegmentTime,  
             MAX(CAST(tblTrace.trFinish - tblTrace.trStart AS TIME(2))) AS SlowestSegmentTime            
        FROM tblTrace 
       INNER JOIN 
             tblUsers 
          ON usrID = tr_usrID
       WHERE tr_vnuID = @vnuID 
         AND trFinish IS NOT NULL 
         AND tr_usrID IS NOT NULL 
         AND trObjectType LIKE 'Segment%'  
         AND trStart BETWEEN @StartDate AND @EndDate 
         AND tblUsers.usrEmail NOT LIKE '%@test%'
) coreData

【问题讨论】：

标签： sql sql-server time int datediff

【解决方案1】：

就我个人而言，我会首先使用分组来提高效率（这部分当然是可选的），但是您的问题正在发生，因为它是平均秒数，但将其他秒数报告为时间。使用以下answer，您可以在秒和时间之间进行转换，以便进行相应的比较，或者您可以将以前的列转换为秒。

SELECT  
    FastestSegmentTime = MIN(CAST(tblTrace.trFinish - tblTrace.trStart AS TIME(2)))
    , SlowestSegmentTime = MAX(CAST(tblTrace.trFinish - tblTrace.trStart AS TIME(2)))
    , AvgSegmentTime = DATEADD(ms, 1000 * AVG(DATEDIFF(SECOND, tblTrace.trStart , tblTrace.trFinish)),0)
FROM 
    tblTrace
    INNER JOIN tblUsers ON usrID = tr_usrID
WHERE 
    (tblTrace.trFinish IS NOT NULL)
    AND (tblTrace.trObjectType LIKE 'Segment%') 
    AND (tblTrace.tr_vnuID = @vnuID) 
    AND (tblTrace.trStart BETWEEN @StartDate AND @EndDate)
    AND (tblUsers.usrEmail NOT LIKE '%@test%')

【讨论】：

【解决方案2】：

尝试像这样将平均 datediff 添加到 0：

SELECT  FastestSegmentTime , SlowestSegmentTime,  
 (SELECT dateadd(second, AVG(DateDiff(SECOND, tblTrace.trStart , tblTrace.trFinish)),0) as AVGSegmentTime
    FROM tblTrace
   INNER JOIN 
         tblUsers 
      ON usrID = tr_usrID
   WHERE tblTrace.trFinish IS NOT NULL 
     AND tblTrace.trObjectType LIKE 'Segment%' 
     AND tblTrace.tr_vnuID = @vnuID 
     AND tblTrace.trStart BETWEEN @StartDate AND @EndDate 
     AND tblUsers.usrEmail NOT LIKE '%@test%' ) as AvgSegmentTime
    FROM ( 
      SELECT MIN(CAST(tblTrace.trFinish - tblTrace.trStart AS TIME(2))) AS FastestSegmentTime,  
             MAX(CAST(tblTrace.trFinish - tblTrace.trStart AS TIME(2))) AS SlowestSegmentTime            
        FROM tblTrace 
       INNER JOIN 
             tblUsers 
          ON usrID = tr_usrID
       WHERE tr_vnuID = @vnuID 
         AND trFinish IS NOT NULL 
         AND tr_usrID IS NOT NULL 
         AND trObjectType LIKE 'Segment%'  
         AND trStart BETWEEN @StartDate AND @EndDate 
         AND tblUsers.usrEmail NOT LIKE '%@test%'
) coreData

【讨论】：

您可以使用Cast('00:00:00.00' as Time) 而不是0 作为DateAdd 的第三个参数