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From: "David Johnston" <polobo@yahoo.com>
To: "'JORGE MALDONADO'" <jorgemal1960@gmail.com>, <pgsql-sql@postgresql.org>
References: 
 <CAAY=A7-v4-iSVgrapiFjq4wujyVqyW-7s0vsJHu7dLb93g__eA@mail.gmail.com>
In-Reply-To: 
 <CAAY=A7-v4-iSVgrapiFjq4wujyVqyW-7s0vsJHu7dLb93g__eA@mail.gmail.com>
Subject: Re: Query with LIMIT clause
Date: Sun, 9 Sep 2012 13:45:25 -0400
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From: pgsql-sql-owner@postgresql.org =
[mailto:pgsql-sql-owner@postgresql.org]
On Behalf Of JORGE MALDONADO
Sent: Sunday, September 09, 2012 1:26 PM
To: pgsql-sql@postgresql.org
Subject: [SQL] Query with LIMIT clause

I have the following records that I get from a query, the fields are =
date
type in day/month/year format:

-------------------------------------=20
Initial =A0 =A0 =A0 =A0 =A0 Final
Date =A0 =A0 =A0 =A0 =A0 =A0Date
-------------------------------------
27/08/2012 =A0=A004/09/2012
29/08/2012 =A0=A009/09/2012
28/08/2012 =A0=A009/09/2012
30/08/2012 =A0=A009/09/2012
30/08/2012 =A0=A009/09/2012
27/08/2012 =A0=A009/09/2012
31/08/2012 =A0=A009/09/2012
28/08/2012 =A0=A010/09/2012
05/09/2012 =A0=A016/09/2012

As you can see, this result is ordered by Final Date. What I need is to =
get
the last 5 records only. If I use the LIMIT 5 clause I get the first 5. =
I
have tried an ORDEY BY DESC but the result is the same. I will very much
appreciate your comments.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.

First, you should really order by both columns, not just "final date".  =
The
ties on 9/9/12 are unordered.

Second, you will indeed need to reverse the sort order and then take the
first 5 records; figuring out and limiting on the last 5 isn't worth the
effort.

SELECT initial_date, final_date
FROM date_source
ORDER BY final_date DESC, initial_date DESC
LIMIT 5

You can put the above into a sub-query and re-order if the final result =
is
needed in ascending order.

If this doesn't seem to work you will want to provide the exact
query/queries you are trying so that someone may spot what you are doing
wrong.

Dave