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
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> 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.

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

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