[GENERAL] regexp on null
8.3.4 on Linux Is there a way to regexp match on a null value? Or is it necessary to OR in a or x is null? Thanks in Advance !
Re: [GENERAL] regexp on null
Hey Dave, Did you consider to use coalesce() ? Regards, Dmitriy 2010/9/10 Gauthier, Dave dave.gauth...@intel.com 8.3.4 on Linux Is there a way to regexp match on a null value? Or is it necessary to OR in a or x is null? Thanks in Advance !
Re: [GENERAL] regexp on null
On Fri, Sep 10, 2010 at 9:00 AM, Gauthier, Dave dave.gauth...@intel.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 -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] regexp on null
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.broer...@gmail.com] Sent: Friday, September 10, 2010 12:19 PM To: Gauthier, Dave Cc: pgsql-general@postgresql.org Subject: Re: [GENERAL] regexp on null On Fri, Sep 10, 2010 at 9:00 AM, Gauthier, Dave dave.gauth...@intel.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 -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] regexp on null
On Fri, Sep 10, 2010 at 9:56 AM, Gauthier, Dave dave.gauth...@intel.com wrote: 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. Perhaps the easiest was to help such users is to make the column(s) in question NOT NULL DEFAULT ''. -- Regards, Richard Broersma Jr. Visit the Los Angeles PostgreSQL Users Group (LAPUG) http://pugs.postgresql.org/lapug -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] regexp on null
On Fri, Sep 10, 2010 at 10:25:55AM -0700, Richard Broersma wrote: On Fri, Sep 10, 2010 at 9:56 AM, Gauthier, Dave dave.gauth...@intel.com wrote: 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. Perhaps the easiest was to help such users is to make the column(s) in question NOT NULL DEFAULT ''. I think it's a very, very bad idea to make a default like that. I'm aware that it's common in one of those Oracle properties, but it needs to stay confined there. Cheers, David. -- David Fetter da...@fetter.org http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: david.fet...@gmail.com iCal: webcal://www.tripit.com/feed/ical/people/david74/tripit.ics Remember to vote! Consider donating to Postgres: http://www.postgresql.org/about/donate -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] regexp on null
Agree with David. Regards, Dmitriy 2010/9/10 David Fetter da...@fetter.org On Fri, Sep 10, 2010 at 10:25:55AM -0700, Richard Broersma wrote: On Fri, Sep 10, 2010 at 9:56 AM, Gauthier, Dave dave.gauth...@intel.com wrote: 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. Perhaps the easiest was to help such users is to make the column(s) in question NOT NULL DEFAULT ''. I think it's a very, very bad idea to make a default like that. I'm aware that it's common in one of those Oracle properties, but it needs to stay confined there. Cheers, David. -- David Fetter da...@fetter.org http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: david.fet...@gmail.com iCal: webcal://www.tripit.com/feed/ical/people/david74/tripit.ics Remember to vote! Consider donating to Postgres: http://www.postgresql.org/about/donate -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
