PM78070: INCORROUT OF QUERY WITH EXCEPT WHEN IT RUNS AS A SUBQUERY.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• This issue is about incorrout of  query with key word "except"
  when it runs as a subquery:
  
   eg:
  
  SELECT COUNT(*) FROM ( (SELECT * FROM T1) EXCEPT ALL
  (SELECT * FROM T2 WHERE ...) ) AS TEMP ;
  
  it runs as a subquery the count is higher.
  
  
  (SELECT * FROM T1) EXCEPT ALL (SELECT * FROM T2 WHERE...) ;
  
  returns expected results.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: DB2 for z/OS users with a query which        *
  *                 contains UNION, EXCEPT, EXCEPT ALL or ORDER  *
  *                 BY and whose top query block has exactly     *
  *                 one table.                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: A query may give incorrect output when  *
  *                      the query satisfies the conditions      *
  *                      below:                                  *
  *                                                              *
  *                      1.Top query block has exactly one       *
  *                        table.                                *
  *                      2.The query contains UNION, EXCEPT,     *
  *                        EXCEPT ALL or ORDER BY.               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A query may give incorrect output when the query contains
  UNION, EXCEPT, EXCEPT ALL or ORDER BY and its top query
  block has exactly one table.
  
  For example,
  
  SELECT *
  FROM
  (SELECT C1 FROM  T1
   UNION
   SELECT C1 FROM  T2) AS T3
  

Problem conclusion

• The problems mentioned above are fixed so that DB2 will return
  correct results in that situation.
  
  
  ADDITIONAL KEYWORDS:
  
  SQLUNION SQLEXCEPT SQLEXCEPTALL SQLORDERBY SQLINCORR INCORROUT
  SQLINCORROUT DB2INCORR/K
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UK91069 UK91070

Modules/Macros

• DSNXOPRP
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK91069

     UP13/02/07 P F302

• R910 PSY UK91070

     UP13/02/07 P F302

Fix is available

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