Date: Fri, 10 Nov 2006 16:24:28 +0100
From: "A. Kretschmer" <andreas.kretschmer@schollglas.com>
To: pgsql-sql@postgresql.org
Subject: Re: Between and miliseconds (timestamps)
Message-ID: <20061110152427.GA3634@a-kretschmer.de>
References: <55c095e90611100628m1322eea5jeeca3a94d90e1eb1@mail.gmail.com>
	<20061110144458.GA2909@a-kretschmer.de>
	<55c095e90611100650q3ec0ec27tc0f8e94a0eb032eb@mail.gmail.com>
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am  Fri, dem 10.11.2006, um 12:50:38 -0200 mailte Ezequias Rodrigues da Rocha folgendes:
>     > select * from base.table
>     > where when
>     > between
>     > '2006-09-06 00:00: 00.000000'
>     > and
>     > '2006-09-06 23:59:59.999999'
>     > order by 2
>     >
>     > Is there a simplest way or not ?
> 
>     Yes. ... where when = '2006-09-06'::date.
> 
> 
> I didn't understand you. Wha you mean '::date' ?

This is a so called CAST. For example:

test=# select now();
              now
-------------------------------
 2006-11-10 16:19:49.543082+01
(1 row)

test=# select now()::date;
    now
------------
 2006-11-10
(1 row)


Read more about this:
16:23 < akretschmer> ??cast
16:23 < rtfm_please> For information about cast
16:23 < rtfm_please> see http://www.postgresql.org/docs/current/static/sql-createcast.html
16:23 < rtfm_please> or http://www.postgresql.org/docs/current/static/sql-expressions.html#SQL-SYNTAX-TYPE-CASTS


> 
> And if I have a period of time bigger than 1 day ?

BETWEEN includes the boundaries, if you have full days so say something
like 'between first_day and last_day'.

Do you need time-boundaries? Rewrite your query to something like
'where time_column > time_1 and time_column < time_2'


Andreas
-- 
Andreas Kretschmer
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