From: Tom Lane <tgl@sss.pgh.pa.us>
To: Bill <bchie@opensys.com.hk>
Cc: pgsql-sql@postgresql.org
Subject: Re: Re: DateDiff, IsNull?
Date: Wed, 15 Aug 2001 00:35:00 -0400
Message-ID: <24829.997850100@sss.pgh.pa.us> (raw)
In-Reply-To: <9lcrij$15lk$2@news.tht.net>
References: <9lb25o$psq$1@news.tht.net>
<Pine.WNT.4.33.0108140634400.1680-100000@CX1198465-B>
<9lcrij$15lk$2@news.tht.net>
"Bill" <bchie@opensys.com.hk> writes:
> IsNull work like this
> SELECT IsNull( user_name, '') FROM user ;
> then the query will return empty string when the field user_name is null
Apparently, IsNull is Microsoft-speak for the SQL standard's COALESCE
function. COALESCE is defined as returning the first of its parameters
that is not NULL.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, bchie@opensys.com.hk
Subject: Re: Re: DateDiff, IsNull?
In-Reply-To: <24829.997850100@sss.pgh.pa.us>
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