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Re: isnull

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Joseph Shraibman <jks(at)p1(dot)selectacast(dot)net>
Cc: jhunt(at)chac(dot)qld(dot)edu(dot)au, "pgsql-sql(at)postgresql(dot)org" <pgsql-sql(at)postgresql(dot)org>
Subject: Re: isnull
Date: 2000-03-31 01:43:00
Message-ID: 200003310143.UAA03317@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-sql
> Julie Hunt wrote:
> 
> > Yes, you're right.  I remember attempting to do an outer left join using the
> > nullif but without success so I used the case function instead with success.
> > Maybe someone else knows more about nullif and why it doesn't seem to work.
> >
> > Regards,
> > Julie
> >
> 
> I've actually taken a closer look at the web page and not only did the name change,
> but I now notice that they change what it is supposed to do as well.  It does work
> as currently defined, but I needed something that does what the original
> documentation said:
> 
> IFNULL(input,non-NULL substitute)
>  return second argument if first is NULL
>  Example:        IFNULL(c1, 'N/A')
> 

New function is COALESCE.  It returns the first non-null argument.

-- 
  Bruce Momjian                        |  http://www.op.net/~candle
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

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  • Re: isnull at 2000-03-30 23:07:16 from Joseph Shraibman

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