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Message-ID: <bf54be870701170701k323bad55j4f4a383112381a46@mail.gmail.com>
Date: Wed, 17 Jan 2007 20:01:00 +0500
From: "Shoaib Mir" <shoaibmir@gmail.com>
To: "Andrew Sullivan" <ajs@crankycanuck.ca>
Subject: Re: Update query by joining multiple tables.
Cc: pgsql-sql@postgresql.org
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Might be a view and then a rule attached with that can help you out with
doing updates using joins

--------------
Shoaib Mir
EnterpriseDB (www.enterprisedb.com)

On 1/17/07, Andrew Sullivan <ajs@crankycanuck.ca> wrote:
>
> On Wed, Jan 17, 2007 at 04:50:18PM +0530, Moiz Kothari wrote:
> > http://www.postgresql.org/docs/8.1/interactive/sql-update.html, it is
> not
> > specified if a join can be done between multiple tables to update a
> table, i
>
> Sure it is:
>
> A list of table expressions, allowing columns from other tables to
> appear in the WHERE condition and the update expressions.
>
> a
>
> --
> Andrew Sullivan  | ajs@crankycanuck.ca
> Users never remark, "Wow, this software may be buggy and hard
> to use, but at least there is a lot of code underneath."
>                 --Damien Katz
>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
>        choose an index scan if your joining column's datatypes do not
>        match
>

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Might be a view and then a rule attached with that can help you out with doing updates using joins<br><br>--------------<br>Shoaib Mir<br>EnterpriseDB (<a href="http://www.enterprisedb.com">www.enterprisedb.com</a>)<br><br>
<div><span class="gmail_quote">On 1/17/07, <b class="gmail_sendername">Andrew Sullivan</b> &lt;<a href="mailto:ajs@crankycanuck.ca">ajs@crankycanuck.ca</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;">
On Wed, Jan 17, 2007 at 04:50:18PM +0530, Moiz Kothari wrote:<br>&gt; <a href="http://www.postgresql.org/docs/8.1/interactive/sql-update.html">http://www.postgresql.org/docs/8.1/interactive/sql-update.html</a>, it is not<br>
&gt; specified if a join can be done between multiple tables to update a table, i<br><br>Sure it is:<br><br>A list of table expressions, allowing columns from other tables to<br>appear in the WHERE condition and the update expressions.
<br><br>a<br><br>--<br>Andrew Sullivan&nbsp;&nbsp;| <a href="mailto:ajs@crankycanuck.ca">ajs@crankycanuck.ca</a><br>Users never remark, &quot;Wow, this software may be buggy and hard<br>to use, but at least there is a lot of code underneath.&quot;
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;--Damien Katz<br><br>---------------------------(end of broadcast)---------------------------<br>TIP 9: In versions below 8.0, the planner will ignore your desire to<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; choose an index scan if your joining column&#39;s datatypes do not
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; match<br></blockquote></div><br>

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