SQL> CONN SYS AS SYSDBA
Connected.
SQL> show con_name;
CON_NAME 
------------------------------
CDB$ROOT

SQL> select name, con_id from v$pdbs;

NAME                               CON_ID
------------------------------ ----------
PDB$SEED                                2
PDBORCL                                 3

SQL> select name, open_mode from v$pdbs;

NAME                           OPEN_MODE
------------------------------ ----------
PDB$SEED                       READ ONLY
PDBORCL                        READ WRITE

SQL> alter session set container = pdborcl;

Session altered.

SQL> select name, open_mode from v$pdbs;

NAME                           OPEN_MODE
------------------------------ ----------
PDBORCL                        READ WRITE

SQL> alter user hr account unlock;

User altered.

SQL> alter user hr identified by hr;

User altered.

SQL> select table_name from dba_tables
  2  where owner = 'HR';

TABLE_NAME
----------
REGIONS
LOCATIONS
DEPARTMENTS
JOBS
EMPLOYEES
JOB_HISTORY
COUNTRIES

7 rows selected.

SQL> CONN hr/hr @pdborcl;
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified 


Warning: You are no longer connected to ORACLE.

# tnsnames.ora Network Configuration File: D:\app\Bilal\product\12.1.0\dbhome_1\NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.

LISTENER_ORCL1 =
  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
    )
    (CONNECT_DATA =
      (SID = CLRExtProc)
      (PRESENTATION = RO)
    )
  )

ORCL1 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl1)
    )
  )

PBDORCL =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = pdborcl)
    )
  )

SQL> CONN hr/hr @pdborcl;
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified

C:\WINDOWS\system32>lsnrctl status
LSNRCTL for 64-bit Windows: Version 12.1.0.2.0 - Production on 27-DEC-2015 08:54:23
Copyright (c) 1991, 2014, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=DESKTOP-CNSB38I)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for 64-bit Windows: Version 12.1.0.2.0 - Production
Start Date                26-DEC-2015 21:14:30
Uptime                    0 days 11 hr. 39 min. 53 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   D:\app\Bilal\product\12.1.0\dbhome_1\network\admin\listener.ora
Listener Log File         D:\app\Bilal\product\12.1.0\dbhome_1\log\diag\tnslsnr\DESKTOP-CNSB38I\listener\alert\log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=DESKTOP-CNSB38I)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=DESKTOP-CNSB38I)(PORT=5500))(Security=(my_wallet_directory=D:\APP\BILAL\admin\orcl1\xdb_wallet))(Presentation=HTTP)(Session=RAW))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "orcl1" has 1 instance(s).
  Instance "orcl1", status READY, has 1 handler(s) for this service...
Service "orcl1XDB" has 1 instance(s).
  Instance "orcl1", status READY, has 1 handler(s) for this service...
Service "pdborcl" has 1 instance(s).
  Instance "orcl1", status READY, has 1 handler(s) for this service...
The command completed successfully

C:\WINDOWS\system32>lsnrctl services

LSNRCTL for 64-bit Windows: Version 12.1.0.2.0 - Production on 27-DEC-2015 08:57:18

Copyright (c) 1991, 2014, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=DESKTOP-CNSB38I)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0
         LOCAL SERVER
Service "orcl1" has 1 instance(s).
  Instance "orcl1", status READY, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:1 refused:0 state:ready
         LOCAL SERVER
Service "orcl1XDB" has 1 instance(s).
  Instance "orcl1", status READY, has 1 handler(s) for this service...
    Handler(s):
      "D000" established:0 refused:0 current:0 max:1022 state:ready
         DISPATCHER <machine: DESKTOP-CNSB38I, pid: 10520>
         (ADDRESS=(PROTOCOL=tcp)(HOST=DESKTOP-CNSB38I)(PORT=58554))
Service "pdborcl" has 1 instance(s).
  Instance "orcl1", status READY, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:1 refused:0 state:ready
         LOCAL SERVER
The command completed successfully

SQL*Plus: Release 12.1.0.2.0 Production on Mon Dec 28 00:38:36 2015

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Enter user-name: hr@DESKTOP-CNSB38I:1521/pdborcl
ERROR:
ORA-12504: TNS:listener was not given the SERVICE_NAME in CONNECT_DATA


Enter user-name: hr@pdborcl
Enter password:
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified

Enter user-name: sys as sysdba
Enter password:

Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options

SQL> show con_name

CON_NAME
------------------------------
CDB$ROOT