From: Steve Midgley <public@misuse.org>
To: pgsql-sql@postgresql.org
Subject: Selecting rows with "static" ordering
Date: Thu, 26 Apr 2007 17:01:11 -0700
Message-ID: <20070427001004.B5F5D9FBABA@postgresql.org> (raw)
Hello,
I have a strange problem (or one that I've never had before anyway). I
am searching for a list of "id's" for a given table (these id values
are generated at run-time and held statically in an application-local
variable).
From that application, I want to retrieve all those rows, and I want
them in the order they are currently stored in that variable. So take
for example this foreign application variable:
ids = "3,2,5,1,4"
The application then executes this sql:
select * from table where id in (3,2,5,1,4)
As-is, of course, the above query will return the 5 records in a
semi-random (i.e. unpredictable/unreliable) order. And I don't want to
just "order by id" - I want to "order by id(3,2,5,1,4)" (if you see
what I mean)
Is there a "neat trick" that anyone knows for pulling this off in a
single query? Basically right now I'm issuing 5 queries to the backend
to ensure ordering but this horribly inefficient.
Any input or advice would be appreciated,
Steve
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: public@misuse.org
Subject: Re: Selecting rows with "static" ordering
In-Reply-To: <20070427001004.B5F5D9FBABA@postgresql.org>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox