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Advanced where  between but only for time, not for date.

Posted on 2009-04-14
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Last Modified: 2012-05-06
Hi expert!

Im using SQL Server 2005 and have question. Look on the picyure.  I need to apply criteria over date like this
WHERE  (dbo.LTimeSlots.StartDateTime BETWEEN dbo.LCampaignTimes.BTime AND dbo.LCampaignTimes.ETime)

But I need to check only for part of time (Hour, Minutes, second) and to ignore data part  (year, month, day) which is total different.   How to do this most effective way,  I have index over dbo.LTimeSlots.StartDateTime ?

Thank you!

sql-Date.JPG
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Question by:dvplayltd
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6 Comments
 
LVL 92

Expert Comment

by:Patrick Matthews
ID: 24142622
Hello dvplayltd,

This will be slow...

WHERE  CONVERT(varchar, dbo.LTimeSlots.StartDateTime, 8) BETWEEN CONVERT(varchar, dbo.LCampaignTimes.BTime, 8) AND CONVERT(varchar, dbo.LCampaignTimes.ETime, 8)

Regards,

Patrick
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LVL 11

Accepted Solution

by:
N R earned 500 total points
ID: 24142643
Here you go:
WHERE (dbo.LTimeSlots.StartDateTime BETWEEN convert(datetime,dbo.LCampaignTimes.BTime,108) AND convert(datetime,dbo.LCampaignTimes.ETime,108))

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Author Comment

by:dvplayltd
ID: 24142936
To Gallitin

Is it possible to forget to apply Convert also for StartDateTime ? I mean to be:

WHERE (convert(datetime,dbo.LTimeSlots.StartDateTime,108)  BETWEEN convert(datetime,dbo.LCampaignTimes.BTime,108) AND convert(datetime,dbo.LCampaignTimes.ETime,108))

And this convert convert to time, or to sring ? Becaues if is to string it will not work property ?
 
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LVL 92

Expert Comment

by:Patrick Matthews
ID: 24143721
dvplayltd said:
>>Is it possible to forget to apply Convert also for StartDateTime ? I mean to be:

Please look at my first post--that is exactly what I did :)

Patrick
0
 

Author Comment

by:dvplayltd
ID: 24143767
To matthewspatrick

I find best solution, here to you to know it :-). It is REALLY faster .. difrence is about 0.5 sec. over 0.6 sec. total time ..

      WHERE      (dbo.LTimeSlots.StartDateTime - CAST(FLOOR(CAST(dbo.LTimeSlots.StartDateTime AS float)) AS datetime)
          BETWEEN      (@BTime - CAST(FLOOR(CAST(@BTime AS float)) AS datetime))  AND
                              (@ETime - CAST(FLOOR(CAST(@ETime AS float)) AS datetime))  )
0
 

Author Comment

by:dvplayltd
ID: 24143780
Yes, but in first post you convert it to varchar, then compare it. I do not think that compare like nvarchar is egual to compare number and may result wrong result.
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