|
Problem IC80668
|
Status: Closed |
LIKE CLAUSE MAY RETURN INCORRECT RESULTS FOR VARCHAR COLUMN IN UNICODE DATABASE |
| product: |
DB2 FOR LUW / DB2FORLUW / 950 - DB2 |
| Problem description: |
If you have example data below:
db2 "insert into t1 values ('a_abc')"
db2 "insert into t1 values ('a_bc')"
db2 "insert into t1 values ('a__c')"
db2 "insert into t1 values ('a2bc')"
db2 "insert into t1 values ('aabc')"
db2 "insert into t1 values ('abc')"
* The above '__' represents one multi-byte underscore charactor
in UTF-8.
* The above '_' represents one single-byte undersocre charactor
in UTF-8.
And run below queries:
db2 "select * from t1 where NAME LIKE '%a__'" <<-- SQL #1
db2 "select * from t1 where NAME LIKE '%a__a%'" <<-- SQL #2
db2 "select * from t1 where NAME LIKE '%a__b%'" <<-- SQL #3
You will have below different results for char and varchar.
type : #1 : #2 : #3 :
------------------------
varchar : 5 : 1 : 1 : <<-- incorrect
char : 6 : 1 : 4 : <<-- correct
You will have correct results if the column is defined as char.
But you will have incorrect results if the column is defined as
varchar. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* DB2 UDB Version 9.5. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error description field for more information. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Version 9.5 FixPack 10. *
**************************************************************** |
| Local Fix: |
|
| Solution |
Problem was first fixed in DB2 UDB Version 9.5 FixPack 10. |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 05.01.2012
28.08.2012
28.08.2012 |
| Problem solved at the following versions (IBM BugInfos) |
9.5.FP10
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.5.0.10
|
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