Changes the output displaying the digit separator to the
    specified character. The digit separator is the symbol that
    separates groups of three digits in values greater than 999. For
    example, the comma is the digit separator in the number 1,000.

    (SQL produces digit separators in output when you specify the
    comma (,)  edit string for the column. See the DATATRIEVE HELP
    topic for more information on edit strings.)

    You must enclose the digit-sep-char argument within single
    quotation marks.

    If you do not specify an alternate character, the default is
    either the comma (,)  or the value specified by the logical name
    SYS$DIGIT_SEP.