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Message Posted: Tue, 10 May 2011 @ 08:47:54 GMT


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Subj:		Re: Recursive Queries and Stored Procedures

From:		Simon Bloomer

Dieter Noeth wrote:

Recursion can usually be rewritten using some loops: WHILE/REPEAT and INSERTs into a Volatile Table within the SP.

Or maybe you might be able to rewrite the logic using OLAP functions.

What's the original query?

Dieter

The original query is basically what is shown below

     WITH RECURSIVE HISTORY (CURRNT, PREVIOUS, Depth) AS
       (SELECT TICKET_ID,
               Withdrawn_Ticket_Airline_Cd||
               SUBSTR(Withdrawn_Ticket_Num,01,10)||
               SUBSTR(Withdrawn_Ticket_Issue_Dt,01,04)||
               SUBSTR(Withdrawn_Ticket_Issue_Dt,06,02)||
               SUBSTR(Withdrawn_Ticket_Issue_Dt,09,02), 0
           FROM workdb.dave_temp
               WHERE TICKET_ID = :DTE
        UNION ALL
        SELECT HISTORY.CURRNT, Withdrawn_Ticket_Airline_Cd||
               SUBSTR(Withdrawn_Ticket_Num,01,10)||
               SUBSTR(Withdrawn_Ticket_Issue_Dt,01,04)||
               SUBSTR(Withdrawn_Ticket_Issue_Dt,06,02)||
               SUBSTR(Withdrawn_Ticket_Issue_Dt,09,02), HISTORY.Depth + 1
          FROM HISTORY INNER JOIN workdb.sb_temp
                  ON HISTORY.PREVIOUS = workdb.sb_temp.TICKET_ID
                 AND HISTORY.Depth < 99)
     SELECT * FROM HISTORY
     ORDER BY DEPTH;


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