Solved

tsql select count with interval time each 30 second .

Posted on 2013-01-14
8
652 Views
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 ?
0
Comment
Question by:afifosh
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
  • 2
8 Comments
 
LVL 18

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
0
 
LVL 143

Expert Comment

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 

Open in new window

0
 
LVL 18

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.
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 1

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..
0
 
LVL 18

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)
0
 
LVL 1

Author Comment

by:afifosh
ID: 38774467
i think ur function doesn't work
0
 
LVL 143

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?
0
 
LVL 18

Accepted Solution

by:
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
0

Featured Post

Guide to Performance: Optimization & Monitoring

Nowadays, monitoring is a mixture of tools, systems, and codes—making it a very complex process. And with this complexity, comes variables for failure. Get DZone’s new Guide to Performance to learn how to proactively find these variables and solve them before a disruption occurs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

PL/SQL can be a very powerful tool for working directly with database tables. Being able to loop will allow you to perform more complex operations, but can be a little tricky to write correctly. This article will provide examples of basic loops alon…
This post looks at MongoDB and MySQL, and covers high-level MongoDB strengths, weaknesses, features, and uses from the perspective of an SQL user.
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question