To work with oracle we can use direct query with sqlplus or using P/L SQL tools. To access sqlplus just open command line (command prompt) but ensure open command prompt as Administrator and type "SQLPLUS". Detail step as the follow :
  1. Open command prompt and run as administrator
    2. Open command prompt
  2. Type "SQLPLUS on commandline
    3. Type sqlplus in commandline
  3. Login to user database
    4. if you don't have database please create first with DBA account. In oracle user and database are same. For example i have user MPS, means that MPS is the database.
    Login to database using sqlplus




    If we have an table we can select the table by typing query in SQL. Keep trying, if any question leave the comment. Happy coding.