Peculiar problem in oracle 10g on AIX 5.3.0 With Check constraints

Question

Hi Every One,
I am facing peculiar problem in oracle 10.2.0.1.0,AIX 5.3.0. I created table with check constraints like this
create table test1 (name nvarchar2(1),check (name in('Y','N')));
SQL> create table test1 (name nvarchar2(1),check (name in('Y','N')));
Table created.
SQL> insert into test1 values ('Y');
1 row created.
SQL> COMMIT;
SQL> select from test1 where name = 'Y';* Why this statement is n't working
no rows selected
SQL> select * from test1;
N
Y
ANOTHER INTERSTING ONE IS
SQL> select * from test1 where name in('Y'); Why this statement is n't working
no rows selected
SQL> select * from test1 where name in('Y','Y'); it's working
N
Y
SQL> select * from test1 where name in('','Y'); it's working
N
Y
SQL> select * from test1 where name in('7','Y'); it's working
N
Y
Like
SQL> select * from test1 where name like 'Y'; it's not working
no rows selected
I created a table without check constraints
SQL> create table test2 (name nvarchar2(1));
Table created.
SQL> insert into test2 values ('Y');
1 row created.
SQL> select * from test2;
N
Y
SQL> select * from test2 where name ='Y'; it's working
N
Y
SQL> select * from test2 where name like 'Y'; it's working
N
Y
Database Details
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CHARACTERSET WE8MSWIN1252
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM
PARAMETER VALUE
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY $
NLS_COMP BINARY
NLS_LENGTH_SEMANTICS BYTE
NLS_NCHAR_CONV_EXCP FALSE
NLS_NCHAR_CHARACTERSET AL16UTF16
NLS_RDBMS_VERSION 10.2.0.1.0
Why it's happening. Whehter check constraint is valid or not in Equallity operator and like and in .
Whereever we using single character column with check constraint,it's working with Equality operator and like and in.
IT'S WORKING FINE WITHOUT CHECK CONSTRAINTS.WE HAVE TWO AIX MACHINES WITH ORACLE10G.THE SAME PROBLEM OCCURING IN TWO MACHINES
PLEASE HELP ME .
THANK YOU,
WITH REGARDS,
N.VINODH

Answer 1

h
Edited by: user3266490 on Dec 3, 2008 2:30 AM