Calculate values based on a value expression for every record
    in a record stream. You do not specify a value expression for
    the COUNT statistical function because it operates on the record
    stream formed by the RSE, not on a value expression. When you
    use the AVERAGE, MAX, MIN, and TOTAL statistical functions, you
    specify a value expression and a record selection expression
    (RSE). Oracle Rdb then:

    o  Evaluates the value expression for each record in the record
       stream formed by the RSE

    o  Calculates a single value based on the results of the first
       step

    The RDML Statistical functions are:

    o  AVERAGE

    o  COUNT

    o  MIN

    o  MAX

    o  TOTAL

    For more information and the syntax diagrams see the HELP entry
    on each of these functions.