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DB2 - Problem description

Problem IC67931 Status: Closed

REPLACE('aaa','a','') DOES NOT RETURN NULL IN
VARCHAR2 COMPATIBILITY MODE

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
In VARCHAR2 compatibility mode, the SYSIBM.REPLACE built-in 
function returns an empty string instead of the expected NULL 
value.  For example: 
 
db2 "VALUES REPLACE('aaa','a','')" 
 
1 
--- 
 
 
  1 record(s) selected.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* Varchar2 compatibility mode                                  * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* In VARCHAR2 compatibility mode, the SYSIBM.REPLACE           * 
* built-infunction returns an empty string instead of the      * 
* expectedNULLvalue.  For example:db2 "VALUES                  * 
* REPLACE('aaa','a','')"1---1 record(s) selected.              * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to Version 9.7 FixPack 2.                            * 
****************************************************************
Local Fix:
Use the TRANSLATE function instead of REPLACE: REPLACE(A,B,'') 
-> TRANSLATE(A,'',B).
available fix packs:
DB2 Version 9.7 Fix Pack 2 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 3a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows

Solution
Problem was first fixed in DB2 UDB Version 9.7 FixPack 2.
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC68058 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
15.04.2010
25.05.2010
25.05.2010
Problem solved at the following versions (IBM BugInfos)
9.7.FP2
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.2 FixList