title: ERROR: ORA-12154: TNS:could not resolve the connect identifier specified
body: <p>Whenever I try to login or connect into SQL command line or SQL*Plus (11g Standard Edition Win64) I get an error<br>
  <code>ORA-12154: TNS:could not resolve the connect identifier specified.</code><br>
  I have tried to solve this problem with google help but I can't.<br>
  so please help me out of this!
  <a href="https://i.stack.imgur.com/iJlP8.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iJlP8.jpg" alt="Console screenshot"></a></p>