Casi insensitive while inserting

Question

I have seen a new feature in oracle10G where we can make oracle case insensitive but it works at select but not at insert.
For example
SQL> create table a(name varchar2(10) primary key);
Table created.
SQL> create table b(name varchar2(10) references a)
2 ;
Table created.
SQL> insert into a values('Pan');
1 row created.
SQL> insert into b values('pan');
insert into b values('pankaj')
ERROR at line 1:
ORA-02291: integrity constraint (DBO.SYS_C00673363) violated - parent key not
found
If i write p in lower case it gives me error in referential integrity.Is there any way where we can insert without checking the case.I dont want to use upper function.

Answer 1

I wouldn't work through a reference constraint.
Maybe through a trigger "instead of" as I show here below, but you have to think about the business rule of such thing :
SQL> create table a(name varchar2(10) primary key);
Table created.
SQL>
SQL> create table b(name varchar2(10) references a);
Table created.
SQL>
SQL> insert into a values('Pan');
1 row created.
SQL>
SQL> insert into b values('pan');
insert into b values('pan')
ERROR at line 1:
ORA-02291: integrity constraint (SYSADM.SYS_C00465443) violated - parent key
not found
SQL>
SQL> drop table b;
Table dropped.
SQL> create table b_tbl(name varchar2(10));
Table created.
SQL> create or replace view b as select * from b_tbl;
View created.
SQL> create or replace trigger trg_bi_b
  2  instead of insert on b
  3  begin
  4      insert into b_tbl
  5      select :new.name
  6      from   a
  7      where  upper(name)=upper(:new.name);
  8      if sql%rowcount = 0 then
  9         raise_application_error(-20001,'Name doesn''t exists into a table');
10      end if;
11  end;
12  /
Trigger created.
SQL> insert into b values('pan');
1 row created.
SQL> insert into b values('Pan');
1 row created.
SQL> insert into b values('pAn');
1 row created.
SQL> insert into b values('PAN');
1 row created.
SQL> insert into b values('paN');
1 row created.
SQL> insert into b values('pankaj');
insert into b values('pankaj')
ERROR at line 1:
ORA-20001: Name doesn't exists into a table
ORA-06512: at "SYSADM.TRG_BI_B", line 7
ORA-04088: error during execution of trigger 'SYSADM.TRG_BI_B'
SQL> select * from a;
NAME
Pan
SQL> select * from b;
NAME
pan
Pan
pAn
PAN
paN
SQL> You have to create same one for update.
Nicolas.