From: | Joseph Shraibman <jks(at)selectacast(dot)net> |
---|---|
To: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
Cc: | pgsql-sql <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: exists |
Date: | 2001-08-21 15:24:32 |
Message-ID: | 3B827D30.4030903@selectacast.net |
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Thread: | |
Lists: | pgsql-sql |
Thank you, I was missing the parens.
If I do an explain I see:
-> Index Scan using m_u_and_p_key on m (cost=0.00..3035.22 rows=1363 width=12)
even if I put a limit 1 on the select. Why is that?
Stephan Szabo wrote:
> On Mon, 20 Aug 2001, Joseph Shraibman wrote:
>
>
>>I want to select a boolean if there exists a row in another table that matches this one.
>>So I did select ..., (select count(*) from table2 where ...) > 0 ...
>>but that count(*) was taking forever. I know there is a better way to do it, but whenever
>>I try to use EXISTS I get a syntax error. What is the proper way?
>>
>
> Hmm, on current sources I can do:
> select ..., exists (select * from table2 where ...) from table1;
>
> I don't know if that's new though...
>
--
Joseph Shraibman
jks(at)selectacast(dot)net
Increase signal to noise ratio. http://www.targabot.com
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