The CHOICE and IF-THEN-ELSE value expressions return a value
       based on the evaluation of one or more Boolean expressions. These
       value expressions are useful when you need to assign values that
       depend on certain conditions. They can be used in any statement
       that accepts value expressions, as well as in COMPUTED BY clauses
       for variables or field definitions.

1  –  CHOICE Value Expression

       Returns one of a series of values depending on the evaluation of
       a series of conditional (Boolean) expressions.
       Format
          CHOICE [OF]
               boolean-expression-1 [THEN] value-1
               [boolean-expression-2 [THEN] value-2]
                       .              .     .
                       .              .     .
                       .              .     .
               ELSE value-n
          END_CHOICE

1.1  –  Arguments

    CHOICE

       Marks the beginning of a CHOICE value expression.

    OF

       Is an optional word used to clarify syntax.

    boolean-expression

       Is a Boolean expression.

    THEN

       Is an optional language element you can use to clarify syntax.

    value

       Is the value returned by DEC DATATRIEVE if the corresponding
       Boolean expression evaluates to true.

    ELSE value-n

       Is the value returned by DEC DATATRIEVE if all the Boolean
       expressions evaluate to false.

2  –  IF THEN ELSE Value Expression

       Returns one of two values depending on the evaluation of a
       conditional (Boolean) expression.
       Format
       IF boolean-expression [THEN] value-1 ELSE value-2

2.1  –  Arguments

    boolean-expression

       Is a Boolean expression.

    THEN

       Is an optional language element you can use to clarify syntax.

    value-1

       Is the value returned by DEC DATATRIEVE if the Boolean expression
       evaluates to true.

    ELSE value-2

       Is the value returned by DEC DATATRIEVE if the Boolean expression
       evaluates to false.