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* Can I simplify this somehow?
@ 2013-09-27 15:22 Larry Rosenman <ler@lerctr.org>
2013-09-27 19:24 ` Re: Can I simplify this somehow? Adam Jelinek <ajelinek@gmail.com>
0 siblings, 1 reply; 4+ messages in thread
From: Larry Rosenman @ 2013-09-27 15:22 UTC (permalink / raw)
To: pgsql-sql
I tried(!) to write this as a with (CTE), but failed.
Can one of the CTE experts (or better SQL writer) help me here?
-- generate a table of timestamps to match against
select
generate_series(date_trunc('day',now()-'45 days'::interval),now()+'1
hour'::inte
rval,'1 hour')
AS thetime into temp table timestamps;
-- get a count of logged in users for a particular time
SELECT thetime,case extract(dow from thetime)
when 0 then 'Sunday'
when 1 then 'Monday'
when 2 then 'Tuesday'
when 3 then 'Wednesday'
when 4 then 'Thursday'
when 5 then 'Friday'
when 6 then 'Saturday' end AS "Day", count(*) AS
"#LoggedIn"
FROM timestamps,user_session
WHERE thetime BETWEEN login_time AND COALESCE(logout_time, now())
GROUP BY thetime
ORDER BY thetime;
Thanks for any help at all.
--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 214-642-9640 (c) E-Mail: ler@lerctr.org
US Mail: 108 Turvey Cove, Hutto, TX 78634-5688
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^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Can I simplify this somehow?
2013-09-27 15:22 Can I simplify this somehow? Larry Rosenman <ler@lerctr.org>
@ 2013-09-27 19:24 ` Adam Jelinek <ajelinek@gmail.com>
2013-09-27 19:32 ` Re: Can I simplify this somehow? Larry Rosenman <ler@lerctr.org>
0 siblings, 1 reply; 4+ messages in thread
From: Adam Jelinek @ 2013-09-27 19:24 UTC (permalink / raw)
To: Larry Rosenman <ler@lerctr.org>; +Cc: pgsql-sql
Are you looking for something like this for the result for the last 45 days
or something else?
TIME MON TUE WED ...
09:00 1 3 4
10:00 5 0 8
On Fri, Sep 27, 2013 at 10:22 AM, Larry Rosenman <ler@lerctr.org> wrote:
> I tried(!) to write this as a with (CTE), but failed.
>
> Can one of the CTE experts (or better SQL writer) help me here?
>
> -- generate a table of timestamps to match against
> select
> generate_series(date_trunc('**day',now()-'45 days'::interval),now()+'1
> hour'::inte
> rval,'1 hour')
> AS thetime into temp table timestamps;
>
> -- get a count of logged in users for a particular time
> SELECT thetime,case extract(dow from thetime)
> when 0 then 'Sunday'
> when 1 then 'Monday'
> when 2 then 'Tuesday'
> when 3 then 'Wednesday'
> when 4 then 'Thursday'
> when 5 then 'Friday'
> when 6 then 'Saturday' end AS "Day", count(*) AS "#LoggedIn"
> FROM timestamps,user_session
> WHERE thetime BETWEEN login_time AND COALESCE(logout_time, now())
> GROUP BY thetime
> ORDER BY thetime;
>
> Thanks for any help at all.
>
>
> --
> Larry Rosenman http://www.lerctr.org/~ler
> Phone: +1 214-642-9640 (c) E-Mail: ler@lerctr.org
> US Mail: 108 Turvey Cove, Hutto, TX 78634-5688
>
>
> --
> Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/**mailpref/pgsql-sql<http://www.postgresql.org/mailpref/pgsql-sql;
>
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Can I simplify this somehow?
2013-09-27 15:22 Can I simplify this somehow? Larry Rosenman <ler@lerctr.org>
2013-09-27 19:24 ` Re: Can I simplify this somehow? Adam Jelinek <ajelinek@gmail.com>
@ 2013-09-27 19:32 ` Larry Rosenman <ler@lerctr.org>
2013-09-27 23:12 ` Re: Can I simplify this somehow? Sergey Konoplev <gray.ru@gmail.com>
0 siblings, 1 reply; 4+ messages in thread
From: Larry Rosenman @ 2013-09-27 19:32 UTC (permalink / raw)
To: Adam Jelinek <ajelinek@gmail.com>; +Cc: pgsql-sql
On 2013-09-27 14:24, Adam Jelinek wrote:
> Are you looking for something like this for the result for the last 45
> days or something else?
>
> TIME MON TUE WED ...
> 09:00 1 3 4
> 10:00 5 0 8
>
That would be cool, but just a list is good too.....
--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 214-642-9640 (c) E-Mail: ler@lerctr.org
US Mail: 108 Turvey Cove, Hutto, TX 78634-5688
--
Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-sql
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Can I simplify this somehow?
2013-09-27 15:22 Can I simplify this somehow? Larry Rosenman <ler@lerctr.org>
2013-09-27 19:24 ` Re: Can I simplify this somehow? Adam Jelinek <ajelinek@gmail.com>
2013-09-27 19:32 ` Re: Can I simplify this somehow? Larry Rosenman <ler@lerctr.org>
@ 2013-09-27 23:12 ` Sergey Konoplev <gray.ru@gmail.com>
0 siblings, 0 replies; 4+ messages in thread
From: Sergey Konoplev @ 2013-09-27 23:12 UTC (permalink / raw)
To: Larry Rosenman <ler@lerctr.org>; +Cc: Adam Jelinek <ajelinek@gmail.com>; pgsql-sql
On Fri, Sep 27, 2013 at 12:32 PM, Larry Rosenman <ler@lerctr.org> wrote:
> On 2013-09-27 14:24, Adam Jelinek wrote:
>> TIME MON TUE WED ...
>> 09:00 1 3 4
>> 10:00 5 0 8
>>
> That would be cool, but just a list is good too.....
You need to take a look at this module:
http://www.postgresql.org/docs/9.3/static/tablefunc.html
Particularly look at the crostab(text, text) function.
--
Kind regards,
Sergey Konoplev
PostgreSQL Consultant and DBA
http://www.linkedin.com/in/grayhemp
+1 (415) 867-9984, +7 (901) 903-0499, +7 (988) 888-1979
gray.ru@gmail.com
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^ permalink raw reply [nested|flat] 4+ messages in thread
end of thread, other threads:[~2013-09-27 23:12 UTC | newest]
Thread overview: 4+ messages (download: mbox mbox.gz follow: Atom feed)
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2013-09-27 15:22 Can I simplify this somehow? Larry Rosenman <ler@lerctr.org>
2013-09-27 19:24 ` Adam Jelinek <ajelinek@gmail.com>
2013-09-27 19:32 ` Larry Rosenman <ler@lerctr.org>
2013-09-27 23:12 ` Sergey Konoplev <gray.ru@gmail.com>
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