select name, cdb, con_id from v$database;

select name, pdb from v$services order by pdb, name;

 alter pluggable database pdborcl open;

 alter session set container=pdborcl;

ALTER USER HR IDENTIFIED BY password ACCOUNT UNLOCK;

PDBORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = Izzy)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = pdborcl)
    )
  )