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Message Posted: Wed, 11 Feb 2015 @ 21:44:56 GMT


     
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Subj:   SELECT in SQL Scalar Functions
 
From:   David Clough

I would really like to create an SQL Scalar Function which returns the single value of a Select Statement, so something like this :

     CREATE FUNCTION DeriveYearWeekNr
     (
       nF_NumberOfWeeks INTEGER
     )
     RETURNS INTEGER
     LANGUAGE SQL
     CONTAINS SQL
     DETERMINISTIC
     SQL SECURITY DEFINER
     COLLATION INVOKER
     INLINE TYPE 1
     RETURN (
     SELECT
     MIN(((CAL_PAST.TNT_YR*100)+CAL_PAST.TNT_WK)) AS PAST_YRWK FROM
     MYDB.CALDAYSDIFF_V01 CAL_PAST
     WHERE
     CAL_PAST.WKS_DIFF = nF_NumberOfWeeks
      )
     ;

(Actually the SQL is a little bit more complicated than the above, but it serves to illustrate the point .... i hope)

What I get is 6881 (SELECT is no allowed in RETURN statement of and SQL UDF).

Thing is, the definition does say 'CONTAINS SQL' and that the language is SQL.

So, have I missed the point here, I wonder ... can you only use SQL type functions, like MAX, CASE, etc, or have I just got the syntax of the RETURN statement wrong ?

Anyone know ?

Oh, by the way, we're on v14.10


Regards

David Clough
Senior BI Database Designer
BI Competency Centre



     
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