First We Need to Familiar with  SELECT Statement  before going into other Statements.

Remember:   SELECT is a Data Manipulation Langauage.

First, We Should Install Oracle 9i,10G or 11G in your System.

Remember: 9i (i means Internet) and 10g (g means GRID)

Second, Open SQLPLUS  and Enter Username:scott and Password: tiger.

 Your SQL PLUS is Now Ready to Type the Queries