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Message-ID: <bf05e51c0609102155i1683e18fg47ed27b77113d153@mail.gmail.com>
Date: Sun, 10 Sep 2006 23:55:02 -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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Oops, see correction below...

On 9/10/06, Aaron Bono <postgresql@aranya.com> wrote:
>
> 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
> )
> 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
> ==================================================================
>



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

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Oops, see correction below...<br><br><div><span class="gmail_quote">On 9/10/06, <b class="gmail_sendername">Aaron Bono</b> &lt;<a href="mailto:postgresql@aranya.com">postgresql@aranya.com</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><span class="q">On 9/10/06, <b class="gmail_sendername">James Cloos</b> &lt;<a href="mailto:cloos@jhcloos.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">cloos@jhcloos.com</a>&gt; wrote:</span>
</div><div><div></div><div><span class="q"><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></span></div><div><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" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">parent.id</a><br>)<span class="q"><br>WHERE name ~ 'some_regex'<br>ORDER BY <br></span></div><div>
&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></div><div><span class="sg">&nbsp;&nbsp; Aaron Bono<br>&nbsp;&nbsp; Aranya Software Technologies, Inc.<br>&nbsp;&nbsp; <a href="http://www.aranya.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.aranya.com</a><br>&nbsp;&nbsp; <a href="http://codeelixir.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://codeelixir.com</a><br>==================================================================

</span></div></blockquote></div><br><br clear="all"><br>-- <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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