Re: ANSI Joins

  • From: alan.aschenbrenner@xxxxxxx
  • To: mgogala@xxxxxxxxxxxxxxxxxxxx
  • Date: Tue, 18 Jan 2005 14:03:02 -0700


    I also dislike ANSI syntax.  Besides it being difficult to read, the
optimizer sometimes does crazy things with ANSI syntax (especially when
involving dblinks).  I have rewritten a few selects into non-ANSI syntax,
and the optimizer has chosen a MUCH better execution plan.  I have seen
queries run for minutes in ANSI syntax, but take only seconds when
rewritten in non-ANSI syntax.  Maybe the ANSI syntax query was written
poorly, but not being proficient in it, I couldn't make any suggestions...
(these observations were made with 9i databases)

Has anyone else had this experience?

If it is an optimizer problem, maybe this is fixed in the 10g optimizer.

My 2 cents...


Alan Aschenbrenner
Oracle DBA
Information Handling Services


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                      Mladen Gogala                                             
                      <mgogala@allegients        To:       "'Oracle-L 
(E-mail)'" <oracle-l@xxxxxxxxxxxxx>                                
            >                cc:                            
                      Sent by:                   Subject:  ANSI Joins           
                      01/18/2005 11:45 AM                                       
                      Please respond to                                         

My developers are starting to use ANSI joins in vain hope that they will
make their apps portable
across databases. I have a positive attitude toward ANSI joins: I hate
those verbose extensions
that make SQL statements lengthy and unreadable. What is the opinion of
other people about ANSI joins?
What is the @#$%! allure of those things? Where did they learn it from?
Is there any readable document
that explains  ANSI joins for dummies?

Mladen Gogala
Oracle DBA
Ext. 121



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