Blank padding in case of nchar columns while case insensitive comparison

Question

hi
i have my database on oracle 9i .
i want case insensitive behaviour so i set nls_comp=ANSi and nls_sort to GENERIC_BASELETTER.
all columns of type character are nchar in my database.
but when i execute a query having a where condition on nchar column blanks are not padded and there is no result ( documentation says lanks are padded while comparisons)..
for e.g select * from area where code='bom' does not return result.
i need to do select * from area where rtrim(code) = 'bom'. (note code is of length nchar(10))
please suggest if here is any solutions for this.

Answer 1

It's always helpful when you have problems if you can provide a concrete example of those problems. For example can you provide something like the following the exhibits the problem?
SQL> SELECT * FROM V$VERSION;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for 64-bit Windows: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
SQL> CREATE TABLE AREA(CODE NCHAR(10));
Table created.
SQL> INSERT INTO AREA VALUES ('bom       ');
1 row created.
SQL> SELECT * FROM AREA WHERE CODE = 'bom';
CODE
bom
SQL> SHOW PARAMETER NLS_COMP
NAME                                 TYPE        VALUE
nls_comp                             string
SQL> SHOW PARAMETER NLS_SORT
NAME                                 TYPE        VALUE
nls_sort                             string
SQL> ALTER SESSION SET NLS_COMP=ANSI;
Session altered.
SQL> ALTER SESSION SET NLS_SORT=GENERIC_BASELETTER;
Session altered.
SQL> SELECT * FROM AREA WHERE CODE = 'bom';
CODE
bom