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Old 12-01-2004, 07:04 PM   #1
JMagana
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Registered: Nov 2004
Distribution: kde
Posts: 1

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Question Recursive Query


Hello, I am doing a project in db2. But I am not sure how to create a recursive query.
THanks
Javier Magana
 
Old 12-01-2004, 08:46 PM   #2
win32sux
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Registered: Jul 2003
Location: Los Angeles
Distribution: Ubuntu
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do a search on google for "db2 recursive query" (without the quotes) and you'll get lots of information...

i just did that search, and among the results was this example from the ibm website:

Code:
-----------------------------------------------------------------------------
 -- Licensed Materials - Property of IBM
 --
 -- Governed under the terms of the International
 -- License Agreement for Non-Warranted Sample Code.
 --
 -- (C) COPYRIGHT International Business Machines Corp. 1995 - 2002
 -- All Rights Reserved.
 --
 -- US Government Users Restricted Rights - Use, duplication or
 -- disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 -----------------------------------------------------------------------------
 --
 -- SOURCE FILE NAME: flt.db2
 --
 -- SAMPLE: How to do a RECURSIVE QUERY
 --
 -- SQL STATEMENTS USED:
 --         DROP TABLE
 --         CREATE TABLE
 --         INSERT
 --         SELECT
 --
 -- OUTPUT FILE: flt.out (available in the online documentation)
 -----------------------------------------------------------------------------
 --
 -- For more information about the command line processor (CLP) scripts,
 -- see the README file.
 --
 -- For information on using SQL statements, see the SQL Reference.
 --
 -- For the latest information on programming, building, and running DB2
 -- applications, visit the DB2 application development website:
 --     http://www.software.ibm.com/data/db2/udb/ad
 -----------------------------------------------------------------------------

create table flights (source varchar ( 8 ),
                      destination varchar ( 8 ),
                      d_time integer ,
                      a_time integer ,
                      cost smallint ,
                      airline varchar ( 8 ));

INSERT INTO FLIGHTS VALUES ( 'Paris' ,   'Detroit' ,  null,null, 700 , 'KLM' ),
                           ( 'Paris' ,   'New York' , null,null, 600 , 'KLM' ),
                           ( 'Paris' ,   'Toronto' ,   null,null, 750 , 'AC' ),
                           ( 'Detroit' , 'San Jose' , null,null, 400 , 'AA' ),
                           ( 'New York' , 'Chicago' ,  null,null, 200 , 'AA' ),
                           ( 'Toronto' ,  'Chicago' ,  null,null, 275 , 'AC' ),
                           ( 'Chicago' , 'San Jose' , null,null, 300 , 'AA' );

WITH
 REACH (SOURCE, DESTINATION, COST, STOPS) AS
   ( SELECT SOURCE, DESTINATION, COST, CAST( 0  AS SMALLINT )
      FROM FLIGHTS
       WHERE SOURCE = 'Paris' 
    UNION ALL
     SELECT R.SOURCE, F.DESTINATION, CAST(R.COST+F.COST AS SMALLINT ), CAST(R.STOPS+ 1  AS SMALLINT )
     FROM REACH R, FLIGHTS F
      WHERE R.DESTINATION=F.SOURCE
        AND R.STOPS < 5
   )
SELECT DESTINATION, COST, STOPS FROM REACH;

drop table flights;

Last edited by win32sux; 12-01-2004 at 08:47 PM.
 
  


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