DateDiff, IsNull?

From: "Bill" <bchie(at)opensys(dot)com(dot)hk>
To: pgsql-sql(at)postgresql(dot)org
Subject: DateDiff, IsNull?
Date: 2001-08-14 11:24:44
Message-ID: 9lb25o$psq$1@news.tht.net
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Hello all,

I am a newbie to postgreSQL, is it possible to write a "DateDiff",
"IsNull" function work same as the one in SQL Server and are there and
sample out there? And is it possible to override the existing function and
operator like "+" to become a concate?

Regards
Bill

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