From: Kevin Grittner <Kevin.Grittner@wicourts.gov>
To: Henry Drexler <alonup8tb@gmail.com>
To: pgsql-docs@postgresql.org
Subject: Re: coalesce
Date: Wed, 21 Sep 2011 09:33:36 -0500
Message-ID: <4E79AF70020000250004150D@gw.wicourts.gov> (raw)
In-Reply-To: <CAAtgU9RMNVZEQWZNOuvrnHYVcjHAoi6_kgw0ZZcMDPvm9EndQg@mail.gmail.com>
References: <CAAtgU9RMNVZEQWZNOuvrnHYVcjHAoi6_kgw0ZZcMDPvm9EndQg@mail.gmail.com>
Henry Drexler <alonup8tb@gmail.com> wrote:
> "If the results of the first argument are null, it will return the
> second."
Unless the second is also null, in which case it will return the
third. Unless the third is also null...
The trick is to come up with language which recognizes that there
can be any number of arguments. Personally, I think the existing
language does a good job of that, and is pretty clear.
> so I made this example that makes sense:
>
> COALESCE(column,substitute value)
Perhaps a two-argument example would be helpful, as long as it
doesn't mislead people into thinking the construct is limited to two
arguments.
-Kevin
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To: pgsql-docs@postgresql.org
Cc: Kevin.Grittner@wicourts.gov, alonup8tb@gmail.com
Subject: Re: coalesce
In-Reply-To: <4E79AF70020000250004150D@gw.wicourts.gov>
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