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Re: BUG #3729: Query doesn't return the right answer

From: David Fetter <david(at)fetter(dot)org>
To: Andrius Glozeckas <ndrs(at)systemap(dot)com>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #3729: Query doesn't return the right answer
Date: 2007-11-08 15:21:57
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugs
On Thu, Nov 08, 2007 at 11:23:39AM +0000, Andrius Glozeckas wrote:
> The following bug has been logged online:
> Bug reference:      3729
> Logged by:          Andrius Glozeckas
> Email address:      ndrs(at)systemap(dot)com
> PostgreSQL version: 8.2.5
> Operating system:   Linux Fedora 7
> Description:        Query doesn't return the right answer
> Details: 
> I have a parent_type_id linking to group_type_id on the same table
> (group_type). I am trying to get the groups with certain parent_type_id (be
> it null or 17) and the number of their children in the same query:
> SELECT g1.*, COUNT(g2.*)
> FROM group_type g1 LEFT JOIN group_type g2 ON g1.group_type_id =
> g2.parent_type_id
> WHERE g1.parent_type_id = null 

This should read:

WHERE g1.parent_type_id IS NULL

If you're handling input parameters where you don't know whether they
will be NULL when you write the SQL, use constructs like


David Fetter <david(at)fetter(dot)org>
Phone: +1 415 235 3778  AIM: dfetter666  Yahoo!: dfetter
Skype: davidfetter      XMPP: david(dot)fetter(at)gmail(dot)com

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Subject: Re: BUG #3729: Query doesn't return the right answer

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