CLEAR
------

Remove the contents of the SQL Buffer, delete all columns 
definitions, or clear the screen.

CL[EAR] {BUFF[ER] | SQL | COL[UMNS] | SCR[EEN]}

Notes:
======
  1.) The BUFFER & SQL options both do the same thing.

  2.) The default action is CLEAR SCREEN when no optional
      parameter is displayed.