From: | <pgsql-general(at)commandprompt(dot)com> |
---|---|
To: | Jeremy Hansen <jeremy(at)xxedgexx(dot)com> |
Cc: | <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: why does this select hang postgres??? |
Date: | 2001-08-10 18:09:22 |
Message-ID: | Pine.LNX.4.30.0108101106280.22311-100000@commandprompt.com |
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Thread: | |
Lists: | pgsql-general |
On Fri, 10 Aug 2001 pgsql-general(at)commandprompt(dot)com wrote:
>On Fri, 10 Aug 2001, Jeremy Hansen wrote:
>>select * from env_info,summary,plat_info;
>>Is my statement broken? Is this not legal? Postgres just sits there....
>Well, without a JOIN or a WHERE clause, this query is going to try create
>the raw cartesian product of the two tables.
Er, thought that was a dot. Make that three tables, even worse if these
are even large-ish tables.
I have no idea what your table structure is like, but assuming there is
some sort of relation between these tables, you'd really want to do
something like:
SELECT * FROM env_info INNER JOIN summary
ON (env_info.id=summary.id) INNER JOIN plat_info
ON (env_info.id=plat_info.id);
If there's no relationship between these tables, alternatively, I'm not
sure what you're trying to accomplish. ;)
Regards,
Jw.
--
jlx(at)commandprompt(dot)com by way of pgsql-general(at)commandprompt(dot)com
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