Dropping connected users in Oracle DB

Question

I want to drop some users in Oracle DB using sqlplus but I am getting error:
SQL> DROP USER test CASCADE;
DROP USER test CASCADE
ERROR at line 1:
ORA-01940: cannot drop a user that is currently connected
But when I ran below command to know sessions connected I am not getting any results:
SQL> select sid,serial# from v$session where username = 'test';
no rows selected
Please help me how to drop users in this case.

Answer 1

User names, like all other database objects, are case-sensitive when quoted as strings. Try this variation on your code:
select sid,serial# from v$session where username = 'TEST';
{code}
Cheers, APC