From: Richard Broersma Jr <rabroersma@yahoo.com>
To: Richard Broersma Jr <rabroersma@yahoo.com>
To: operationsengineer1@yahoo.com, "pgsql-sql@postgresql.org" <pgsql-sql@postgresql.org>
Subject: Re: How To Exclude True Values
Date: Fri, 30 Jun 2006 15:49:36 -0700 (PDT)
Message-ID: <20060630224936.41930.qmail@web31813.mail.mud.yahoo.com> (raw)
In-Reply-To: <20060606234031.168.qmail@web31807.mail.mud.yahoo.com>
> Also, I produced a second query using PostgreSQL:
> select a.id_i, a.ir_id, a.test, a.stamp
> from test a
> join
> (
> select max(stamp) as mstamp, id_i
> from test
> group by id_i
> ) b
> on a.stamp = b.mstamp
> where a.test = false
> ;
> -- result
> id_i | ir_id | test | stamp
> ------+-------+------+---------------------
> 4 | 8 | f | 2006-06-05 08:00:00
I found this query produced the same result. It is a list slower than the first with my small
dataset. but maybe it will improve for larger datasets?
select
t1.id_i,
t1.ir_id,
t1.test,
t1.stamp,
t1.inttest
from test as t1
where t1.stamp = ( select max(T2.stamp) from test as t2 where t2.id_i = t1.id_i)
and t1.test = 'f';
Regards,
Richard Broersma Jr.
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To: pgsql-sql@postgresql.org
Cc: rabroersma@yahoo.com
Subject: Re: How To Exclude True Values
In-Reply-To: <20060630224936.41930.qmail@web31813.mail.mud.yahoo.com>
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