Group by time interval

Hi all,
I'd like to group data by some time interval (lets say half hour), so i can't use: group by trunc(date,?) because i don't have a time format which can describe this level of group (unless oracle has upgraded this ability...maybe a feature request:)
is there a workaround to do that? any solution will be appreciated
Regards
Liron

Hi I don't know if this would be the most optimum approach but it got the job done for me.
I my case I had timestamps intead of date and I did the following.
Select (CASE
WHEN (cast(to_char(thetime, 'mi') as int) <= 30 ) THEN
(to_char(thetime, 'hh:') || '00' || to_char(thetime, ' PM') || ' - ' || to_char(thetime, 'hh:') || '30' || to_char(thetime, ' PM'))
ELSE
(to_char(thetime, 'hh:') || '30' || ' ' || to_char(thetime, ' PM') || ' - ' || to_char(thetime + interval '1' hour, 'hh:') || '00' || to_char(thetime, ' PM'))
END) ServiceTime, count(*) ServicedPeople
From
select (systimestamp + interval '15' minute) thetime from dual
UNION
select (systimestamp + interval '30' minute) thetime from dual
UNION
select (systimestamp + interval '45' minute) thetime from dual
UNION
select (systimestamp + interval '60' minute) thetime from dual
UNION
select (systimestamp + interval '75' minute) thetime from dual
UNION
select (systimestamp + interval '90' minute) thetime from dual
group by (CASE
WHEN (cast(to_char(thetime, 'mi') as int) <= 30 ) THEN
(to_char(thetime, 'hh:') || '00' || to_char(thetime, ' PM') || ' - ' || to_char(thetime, 'hh:') || '30' || to_char(thetime, ' PM'))
ELSE
(to_char(thetime, 'hh:') || '30' || ' ' || to_char(thetime, ' PM') || ' - ' || to_char(thetime + interval '1' hour, 'hh:') || '00' || to_char(thetime, ' PM'))
END)

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Hi D.Hansen,
According to your description, you want your chart to display records based on parameter selection. Right?
In this scenario, since your where clause in query is working fine, so it can already return the records dynamically based on Interval selection. Now we just need to put the Date_DateTime into Category in the chart, it supposed to display records dynamically.
Based on your information, we still can't figure out what the issue is. Please post some detail information or screenshots of the report design if possible. It may help us test your case in our local environment. Thank you.
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Edited by: anushree2187 on May 21, 2010 7:28 AM
Edited by: anushree2187 on May 21, 2010 7:37 AM

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Sorry cannot test it right now
Select *
From Table
Where Group = B
AND Open_Date in (SELECT OpenDate FROM Table WHERE Group = A
AND OpenDate BETWEEN OpenDate AND CloseDate )
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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This was driving me crazy, too--and the previous answers did not seem to work. I eventually found that if I click one of the data symbols in the graph in exactly the right spot (see below), it selects only the data symbols and not the line. I can tell this because the little selection dots will be around each data symbol, but no selection dots will be on the line between the data symbols - like the graphic in Yvan's answer. Then and only then will the color symbol in the tool bar show the color of the data symbol, instead of the color of the line. I believe that you then have to first click on the color swatch in the toolbar and then select your color (or choose Show Colors and select from the color tool). Just clicking a color in the crayon box, for example, did not seem to work unless I first clicked on the color swatch in the toolbar, then clicked Show Colors on that dropdown, and +only then+ clicked the crayon or whatever.
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