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tsql select count with interval time each 30 second .

Posted on 2013-01-14
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Last Modified: 2013-01-14
i want to count the number of message from table each 30 second interval  to put in the graph..  which query should give me in this selection ?
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Question by:afifosh
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Expert Comment

by:Cluskitt
ID: 38774392
Try something like:
SELECT COUNT(*) AS Total,CONVERT(char(8),DateField,112)+' '+CONVERT(char(3),DateField,108)+CASE WHEN MINUTE(DateField)<30 THEN '00' ELSE '30' END TimeInterval
FROM Table
GROUP BY CONVERT(char(8),DateField,112)+' '+CONVERT(char(3),DateField,108)+CASE WHEN MINUTE(DateField)<30 THEN '00' ELSE '30' END
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by:Guy Hengel [angelIII / a3]
ID: 38774405
in short:
select CONVERT(varchar(16), date_field, 120)
  , case when DATEPART(field, date_field) < 30 then 0 else 1 end
  , COUNT(*)
from yourtable
group by CONVERT(varchar(16), date_field, 120)
  , case when DATEPART(field, date_field) < 30 then 0 else 1 end 

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Expert Comment

by:Cluskitt
ID: 38774425
angelIII, I could be wrong, but I don't think that would work. That is grouping by yyyy-MM-dd HH:mm, meaning any distinct minute is grouped into a separate category. You would need to create a date with either 0 or 30 minutes. Yours would seem to count all that have :01, :02, etc...

I could be wrong. You're one of the people I respect most regarding SQL around here, but it does seem as if your results aren't quite what the OP requested.
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Author Comment

by:afifosh
ID: 38774434
the two solution not work something is missing
i have something like message , datetimein

each 30 seconds i make a selection using ajaxtime set timeout 30 second
than i want to count record in each .. 30 second..
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Expert Comment

by:Cluskitt
ID: 38774440
I suppose mine would be simpler with 120 as well:
SELECT COUNT(*) AS Total, CONVERT(char(14),DateField,120)+CASE WHEN DATEPART(minute,DateField)<30 THEN '00' ELSE '30' END AS TimeInterval
FROM Table
GROUP BY CONVERT(char(14),DateField,120)+CASE WHEN DATEPART(minute,DateField)<30 THEN '00' ELSE '30' END

(I have a minute function which I remembered won't work with normal T-SQL)
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Author Comment

by:afifosh
ID: 38774467
i think ur function doesn't work
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 38774482
>the two solution not work
can you please clarify "does not work" ?
can you show sample data, requested output, and what you get?

question: the field datetimein  is it datetime data type?
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Accepted Solution

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Cluskitt earned 500 total points
ID: 38774488
Ok, what exactly are you trying to achieve. In your original question, it seems that you were looking for counts for date intervals of 30 seconds. Now it seems that you just want to know how many there were in the last 30 seconds. That is a different thing.

The first one was the one we were answering. For the second, all you need to do is:
SELECT COUNT(*) AS Total
FROM Table
WHERE DATEDIFF(second,DateField,GETDATE())<=30
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