Nonstandard feature for integration with Digital(tm) products

  Explanation:  The syntax indicated is not included in the
  current ANSI and ISO standards for SQL.  This is a feature which
  is provided for compatability with Digital(tm) products such as
  DATATRIEVE and CDD/Plus.

  User Action:  If it is important to have only standard syntax in
  your program, you should remove this syntax.