The SELECT statement lets you specify an expression, the possible values
  the  expression  may  have,  and a list of statements to be executed for
  each possible value.  The  END  SELECT  keywords  terminate  the  SELECT
  block.

  Example

  SELECT ERR
         CASE 11
              PRINT "End of File"
              RESUME 32767
         CASE 131
              PRINT "Record not found"
              RESUME 5000
         CASE ELSE
              ON ERROR GOTO 0
  END SELECT

1  –  Syntax

      SELECT exp1
             case-clause
                  .
                  .
                  .
             [ else-clause ]
      END SELECT

        case-clause:  CASE case-item,...
                      [ statement ]...

        case-item:    { [ rel-op ] exp2 }
                      { exp3 TO exp4    }

        else-clause:  CASE ELSE
                           [ statement ]...