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Date: Sun, 10 Sep 2006 23:54:25 -0500
From: "Aaron Bono" <postgresql@aranya.com>
To: "James Cloos" <cloos@jhcloos.com>
Subject: Re: where clause subqueries vs multiple rows results
Cc: pgsql-sql@postgresql.org
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On 9/10/06, James Cloos <cloos@jhcloos.com> wrote:
>
> I've a query which I'd have liked to word akin to:
>
>   SELECT guid FROM child WHERE the_fkey =
>          ( SELECT id FROM parent WHERE name ~ 'some_regex' )
>          ORDER BY the_fkey, my_pkey;
>
> I got around it by doing the SELECT id first, and then doing a SELECT
> guid for each row returned, appending the results together.
>
> Can that be done in a single query, insead of 1+n queries?



Will this work?

SELECT guid
FROM child
INNER JOIN parent ON (
    child.the_fkey = parent.id
    AND
)
WHERE name ~ 'some_regex'
ORDER BY
    child.the_fkey,
    child.my_pkey
;

I am not sure what table name is from but since you say it is n+1 queries I
assume it is from the child table?  It would help to know what columns are
on which tables.

==================================================================
   Aaron Bono
   Aranya Software Technologies, Inc.
   http://www.aranya.com
   http://codeelixir.com
==================================================================

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On 9/10/06, <b class="gmail_sendername">James Cloos</b> &lt;<a href="mailto:cloos@jhcloos.com">cloos@jhcloos.com</a>&gt; wrote:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I've a query which I'd have liked to word akin to:<br><br>&nbsp;&nbsp;SELECT guid FROM child WHERE the_fkey =<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ( SELECT id FROM parent WHERE name ~ 'some_regex' )<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ORDER BY the_fkey, my_pkey;<br><br>I got around it by doing the SELECT id first, and then doing a SELECT
<br>guid for each row returned, appending the results together.<br><br>Can that be done in a single query, insead of 1+n queries?</blockquote><div><br>&nbsp;<br>Will this work?<br><br></div>SELECT guid <br>FROM child <br>INNER JOIN parent ON (
<br>&nbsp;&nbsp;&nbsp; child.the_fkey = <a href="http://parent.id">parent.id</a><br>&nbsp;&nbsp;&nbsp; AND <br>)<br>WHERE name ~ 'some_regex'<br>ORDER BY <br>&nbsp;&nbsp;&nbsp; child.the_fkey, <br>&nbsp;&nbsp;&nbsp; child.my_pkey<br>;<br><br>I am not sure what table name is from but since you say it is n+1 queries I assume it is from the child table?&nbsp; It would help to know what columns are on which tables.
<br></div><br>==================================================================<br>&nbsp;&nbsp; Aaron Bono<br>&nbsp;&nbsp; Aranya Software Technologies, Inc.<br>&nbsp;&nbsp; <a href="http://www.aranya.com">http://www.aranya.com</a><br>&nbsp;&nbsp; <a href="http://codeelixir.com">
http://codeelixir.com</a><br>==================================================================

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