From: "Vincent Ladlad" <vincentl@ntsp.nec.co.jp>
To: "'Denis P Gohel'" <sqllist@coralindia.com>,
	<pgsql-sql@postgresql.org>
Subject: Re: staggered query?
Date: Thu, 22 Apr 2004 16:44:53 +0800
Message-ID: <000801c42846$166f2120$643b1cac@Titanium>
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In-Reply-To: <003601c4276f$ecac8980$3332a8c0@DENIS>

hey thanks! it worked:)

here's how we did it:
select sampletime from data where 
	(extract(seconds from sampletime)::int)::text 
	in (14, 17, 19);

-----Original Message-----
From: pgsql-sql-owner@postgresql.org
[mailto:pgsql-sql-owner@postgresql.org] On Behalf Of Denis P Gohel
Sent: Wednesday, April 21, 2004 3:12 PM
To: pgsql-sql@postgresql.org
Subject: Re: [SQL] staggered query?


 Hi Try this..

 SELECT Col1 , Col2
 FROM yourtable
 WHERE to_number(to_char(col1, 'SS'),'99') / 10 ) in
(10,20,30,40,50,00);

 HTH

 Denis


> ----- Original Message -----
> From: Vincent Ladlad <vincentl@ntsp.nec.co.jp>
> To: <vincentl@ntsp.nec.co.jp>
> Sent: Wednesday, April 21, 2004 8:23 AM
> Subject: [SQL] staggered query?
>
>
> > hi! im new to SQL, and i need to find a solution
> > to this problem:
> >
> > i have a table with two columns, the first column
> > is of type timestamp.
> >
> > the table contains hundreds of thousands of records.
> > i need to get all the entries/records  at every 10 seconds interval.

> > example, given a table:
> >
> > hh/mm/ss | data
> > ---------------
> > 00:00:00   1
> > 00:00:01   2
> > 00:00:02   3
> > 00:00:03   4
> > 00:00:04   5
> > 00:00:05   6
> > 00:00:06   7
> > 00:00:07   8
> > ..
> > ..
> >
> > my query should return:
> > 00:00:10
> > 00:00:20
> > 00:00:30
> > (etc)
> >
> > is this possible? if yes, how do i do it?
> >
> > thanks!
> >
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>


---------------------------(end of broadcast)---------------------------
TIP 9: the planner will ignore your desire to choose an index scan if
your
      joining column's datatypes do not match

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