Re: Grouping by day, limiting amounts

I came into this thread late, so I don't know what you schema looks like.

I have a table that has a timestamp with time zone field and other data. I
can write a query that give me a count per day

SELECT count(*) AS count, date_trunc( 'day', hour) AS day FROM
hist_callhealth GROUP BY day;

This will give me a count per day, to get the top X

SELECT count, day FROM (SELECT count(*) AS count, date_trunc( 'day', hour)
AS day FROM hist_callhealth GROUP BY day) AS foo ORDER BY count desc limit
X;

Hope this helps,
Woody
IGLASS Networks

-----Original Message-----
From: pgsql-sql-owner(at)postgresql(dot)org [mailto:pgsql-sql-owner(at)postgresql(dot)org]
On Behalf Of A. Kretschmer
Sent: Thursday, October 19, 2006 10:18 AM
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: [SQL] Grouping by day, limiting amounts

am Thu, dem 19.10.2006, um 6:55:41 -0700 mailte chester c young folgendes:
> --- "A. Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com> wrote:
>
> > > I would like to select the 3 (or 10) names with the most votes for
> > each day.
> > >
> > > Any suggestions on how can it be done easily?
>
> Am I misunderstanding, or can you write a simple:
>
> select * from <table> where <date>='2006-10-10'
> limit 5 order by <vote_ct> desc;

>From the first mail:
"I would like to select the 3 (or 10) names with the most votes for each
day."

_FOR_ _EACH_ _DAY_.

Your query returns the values only for one day...

Andreas
--
Andreas Kretschmer
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