Re: returning count(*) when it is > 1, else -1

From: Gerardo Herzig <gherzig(at)fmed(dot)uba(dot)ar>
To: Richard Huxton <dev(at)archonet(dot)com>
Cc: postgres list <pgsql-sql(at)postgresql(dot)org>, pavel(dot)stehule(at)gmail(dot)com
Subject: Re: returning count(*) when it is > 1, else -1
Date: 2008-10-17 12:11:10
Message-ID: 48F880DE.70709@fmed.uba.ar
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Richard Huxton wrote:
> Gerardo Herzig wrote:
>> But it does a doble count(*) that i must avoid.
>> I cant refer to the 'first' count like
>> select case when (select count(*) from test where id=$1 ) AS total
>> > 0 then total
>> else -1
>> end;
>
> SELECT
> CASE WHEN total >0 THEN total ELSE -1 END AS new_total
> FROM (
> SELECT count(*) AS total FROM test WHERE id=$1
> ) AS raw_total
>
Pavel, Richard, you got it dudes! I have to say, that kinda 'reference
before assingment' of "total" doesnt look logical to me.

Thanks again!!
Gerardo

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