value-expr             A value expression. A symbol or a string
                           of symbols used to calculate a value. When
                           you use a value expression in a statement,
                           Oracle Rdb calculates the value associated
                           with the expression and uses that value
                           when executing the statement.

    match-expr             A match expression. An expression in
                           quotation marks that is used to match a
                           pattern. Use the double quote character
                           (")  in C programs. Use the single quote
                           character (')  in Pascal programs. The
                           match expression can include the following
                           special symbols (called wildcards):

                           o  * Matches a string of zero or more
                              characters that maps onto its position

                           o  % Matches a single character that maps
                              onto its position