Re: LIMIT BASED ON PERCENT

From: Kris Kewley <kris(dot)kewley(at)gmail(dot)com>
To: Guillaume Lelarge <guillaume(at)lelarge(dot)info>
Cc: "pgsql-sql(at)postgresql(dot)org" <pgsql-sql(at)postgresql(dot)org>, Another Trad <anothertrad(at)gmail(dot)com>, Lee Hachadoorian <lee(dot)hachadoorian(at)gmail(dot)com>
Subject: Re: LIMIT BASED ON PERCENT
Date: 2009-11-19 00:20:24
Message-ID: E1C9300E-A2D5-4B70-8C4F-6B272915BDBF@gmail.com
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Could you not create a function to do this instead?

Set var_limit = 20% of row count
Replace subquery with var_limit

Kris

On 18-Nov-09, at 14:27, Guillaume Lelarge <guillaume(at)lelarge(dot)info>
wrote:

> Le mercredi 18 novembre 2009 à 20:24:09, Another Trad a écrit :
>> No, It doesn't.
>> In my machine:
>>
>> First select
>> ERROR: syntax error at end of input
>> LINE 1: select * from rapadura.cliente limit 20%
>> ^
>> Second one:
>> ERROR: argument of LIMIT must not contain subqueries
>>
>> Postgres 8.3
>>
>
> It works for Lee because obviously he's working on a 8.4 server. You
> can use
> subquery in a LIMIT clause if you have an 8.4 PostgreSQL server. For
> earlier
> releases, there's no way to do this in a single query.
>
>
> --
> Guillaume.
> http://www.postgresqlfr.org
> http://dalibo.com
>
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