SQL> SET TERMOUT OFF
SQL>
SQL> --Specify that new values for the database_name column
SQL> --go into a substitution variable called databasae_name
SQL> COLUMN database_name NEW_VALUE database_name
SQL>
SQL> --.
SQL> SELECT SYS_CONTEXT('USERENV','DB_NAME') database_name
2 FROM dual;
User System Privileges Page 1
DATABASE_NAME
-----------------------------------------------------------------------------
XE
1 row selected.
SQL>