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Message Posted: Thu, 07 Oct 2004 @ 13:15:47 GMT


     
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Subj:   UDF - Overloading inbuilt functions
 
From:   Narayan Murthy

Is it possible to overload the inbuilt functions like SUM, MAX .etc giving these functions a different behavior.

     Say SUM(col1, positive)
         SUM(col1, even)

I know I can achieve the above by tweaking the WHERE clause OR giving a different name to the function like SUMOFPOSITIVE/SUMOFEVEN but the question is can these inbuilt functions be overloaded.

In the same context would it be possible to have a UDF which would do something like:

     Function SUM (column, flag, behavior)
     If flag = default // i.e. invoke inbuilt sum
             Return SUM(column)
     Else
             // Return based on the behavior - say SUM of positives/even numbers

Narayan



     
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