From: Ken Hill <ken@scottshill.com>
To: Bricklen Anderson <banderson@presinet.com>
Cc: pgsql@yukonho.de
Cc: pgsql-sql@postgresql.org
Subject: Re: Syntax for "IF" clause in SELECT
Date: Wed, 08 Feb 2006 18:06:10 -0800
Message-ID: <1139450771.15713.5.camel@localhost.localdomain> (raw)
In-Reply-To: <43EA7CCD.3050905@presinet.com>
References: <200602090012.52747.pgsql@yukonho.de>
<43EA7CCD.3050905@presinet.com>
This has been something I've been trying do so that I can do some column
comparisons as part of "data-cleaning" work. I'll let you know if this
helps me accomplish my task!
On Wed, 2006-02-08 at 15:20 -0800, Bricklen Anderson wrote:
> pgsql@yukonho.de wrote:
> > Greetings,
> >
> > the following is an MySQL statement that I would like to
> > translate to PostgreSQL:
> >
> > Could someone point me to a documentation of a coresponding
> > Systax for an "IF" clause in the a SELECT,
> > or is the some other way to do this....
> >
> > select
> > if(spektrum is null,' ','J'),
> > if(s19 is null,' ','J'),
> > if(OhneGrenze is null,' ','J'),
> > from namen;
> >
> >
> > Do I need to create my own function to allow this behaviour!
> >
> >
> > my best regards,
> >
> > Stefan
>
> use CASE
>
> Since I'm not a user of MySQL, and if I'm reading your query correctly:
> try
> select (CASE when spektrum is null then 'J' else spektrum end),
> ...
>
> or if you are just trying to replace nulls, then try COALESCE
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: if posting/reading through Usenet, please send an appropriate
> subscribe-nomail command to majordomo@postgresql.org so that your
> message can get through to the mailing list cleanly
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: ken@scottshill.com, banderson@presinet.com, pgsql@yukonho.de
Subject: Re: Syntax for "IF" clause in SELECT
In-Reply-To: <1139450771.15713.5.camel@localhost.localdomain>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox