Syntax options:

    DETERMINISTIC | NOT DETERMINISTIC

    The clause controls the evaluation of an external function in the
    scope of a query:

    o  NOT DETERMINISTIC

       Specifying the NOT DETERMINISTIC clause forces evaluation
       of corresponding functions (in scope of a single query)
       every time the function appears. If a function can return a
       different result each time it is invoked, you should use the
       DETERMINISTIC clause.

    o  DETERMINISTIC

       Specifying the DETERMINISTIC clause can result in a single
       evaluation of corresponding function expressions (in scope
       of a single query), and the resulting value is used in all
       occurrences of the corresponding function expression. When you
       use the DETERMINISTIC clause, Oracle Rdb evaluates whether or
       not to invoke the function each time it is used.

       For example:

       SELECT * FROM T1 WHERE F1() > 0 AND F1() < 20;

       If you define the F1 function as DETERMINISTIC, the function
       F1() may be evaluated just once depending on the optimizer. If
       you define the F1 function as NOT DETERMINISTIC, the function
       F1() is evaluated twice.

       DETERMINISTIC is the default.

    The DETERMINISTIC or NOT DETERMINISTIC clause is not allowed on
    procedure definitions.