From: | "Gauthier, Dave" <dave(dot)gauthier(at)intel(dot)com> |
---|---|
To: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: regexp on null |
Date: | 2010-09-10 16:56:32 |
Message-ID: | 482E80323A35A54498B8B70FF2B879800473BC4924@azsmsx504.amr.corp.intel.com |
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Lists: | pgsql-general |
Ya, I kinda knew about these approaches. The problem ahs to do with novice users who don't know about coalesce or or;ing a check ofr nulls. I was hoping there was some special regexp expression that would match to a null.
Thanks for the quick response, and have a great weekend !
-----Original Message-----
From: Richard Broersma [mailto:richard(dot)broersma(at)gmail(dot)com]
Sent: Friday, September 10, 2010 12:19 PM
To: Gauthier, Dave
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: [GENERAL] regexp on null
On Fri, Sep 10, 2010 at 9:00 AM, Gauthier, Dave <dave(dot)gauthier(at)intel(dot)com> wrote:
> Is there a way to regexp match on a null value?
I would say no.
> Or is it necessary to OR in a .... "or x is null"?
you could use a
COALESCE( text_column, '') ~ E'MyRegEx';
Or perhaps:
( text_column ~ E'MyRegEx' ) IS UNKNOWN
might work.
--
Regards,
Richard Broersma Jr.
Visit the Los Angeles PostgreSQL Users Group (LAPUG)
http://pugs.postgresql.org/lapug
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