DB2 FOR LUW / DB2FORLUW / A50 - DB2

Complex query might return incorrectly sorted rows in situation 
when following conditions are met: 
 
- there is DISTINCT clause in the top SELECT of a query; 
- there is ORDER BY and/or FETCH FIRST n ROWS ONLY clause. 
 
Query snippet: 
 
SELECT DISTINCT ... 
FROM ... 
WHERE ... = ( SELECT ...) 
ORDER BY ... 
 
This query might return incorrect results.

**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 10.5 and Fix Pack 7                   * 
****************************************************************

SELECT DISTINCT should be separated from the ORDER BY: 
 
Query snippet: 
 
SELECT * 
	FROM ( 
		SELECT DISTINCT ... 
		FROM ... 
		WHERE ... = ( SELECT ... ) 
	) 
ORDER BY...

Problem was first fixed in DB2 Version 10.5 and Fix Pack 7

not known / see Local fix

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

11.06.2015
20.01.2016
20.01.2016