ORA-00904: invalid identifier

SQL> SELECT contact_id AS "c_id", last_name, first_name
  2  FROM contacts
  3  ORDER BY "cid";
ORDER BY "cid"
         *
ERROR at line 3:
ORA-00904: "cid": invalid identifier

 

SQL> SELECT contact_id AS "c_id", last_name, first_name
  2  FROM contacts
  3  ORDER BY "c_id";
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