Subject: Coalesce, isEmpty and nvl
Message-Id: <E1Bd43P-000535-00@gaul.cornfield.org.uk>
From: simonw@cornfield.org.uk
Date: Wed, 23 Jun 2004 10:28:27 +0100
Hi
I have an application that I am porting from MySQL to Postgres, and have hit a
problem with coalesce.
I assumed that coalesce() works like nvl() and ifnull and will return the 2nd
argument if the first is NULL or Empty String, just like Orcale/SQLServer with nvl()
or MySQL with ifnull().
Is there a simple way to implement this function other creating an nvl() function
with pg/PLSQL.
Finally, how efficient are pg/PLSQL functions at runtime? Are they re-parsed with
every call, or are parsed once only?
Many thanks
Simon
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
Mailscanner thanks transtec Computers for their support.
