comme vous avez confirmé que certaines choses sont NVARchar'd ..cast le nvarchar en char par exemple
SQL> create table tab(a nvarchar2(2));
Table created.
SQL> insert into tab values ('a');
1 row created.
SQL> select 1, 'hi' from dual
2 union all
3 select 2, a from tab;
select 1, 'hi' from dual
*
ERROR at line 1:
ORA-12704: character set mismatch
échoue car "A" est NVARCHAR. alors to_char it :
SQL> select 1, 'hi' from dual
2 union all
3 select 2, to_char(a) from tab;
1 'HI'
---------- ----
1 hi
2 a
ou convertir la chaîne littérale 'hi' en un Nvarchar
SQL> select 1, n'hi' from dual
2 union all
3 select 2, a from tab;
1 N'
---------- --
1 hi
2 a
