From: Craig Ringer <craig@postnewspapers.com.au>
To: johnf <jfabiani@yolo.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: using a list to query
Date: Sun, 03 May 2009 09:34:57 +0800
Message-ID: <49FCF4C1.8020701@postnewspapers.com.au> (raw)
In-Reply-To: <200905020955.29386.jfabiani@yolo.com>
References: <200905020955.29386.jfabiani@yolo.com>
johnf wrote:
> I have a list (or array) of primary keys stored in a field (data type text).
> I would like to use the list to retrieve all the data from a table based on
> the list.
>
> my text field contains:
> '123,134,343,345'
>
> I would to do something like the following:
>
> Select * from table1 where table1.pkid in (select myTextfield from table2)
>
> So the question is there a simple way to use the list to retrieve my data?
http://www.postgresql.org/docs/8.3/static/functions-matching.html
SELECT * FROM table1
WHERE table1.pkid IN (
SELECT x FROM regexp_split_to_table(myTextfield, ',') AS x
);
... but you should consider storing your list in an array instead, or
using a more conventional child table with a (pkid, refid) pair list.
--
Craig Ringer
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To: pgsql-sql@postgresql.org
Cc: craig@postnewspapers.com.au, jfabiani@yolo.com
Subject: Re: using a list to query
In-Reply-To: <49FCF4C1.8020701@postnewspapers.com.au>
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