Oracle Rdb provides support for DATATRIEVE, the Digital query
    language. You can specify one or more of the following clauses:

    Query header
    Query name
    Default value
    Edit string

    If you specify a DATATRIEVE attribute on a global field, you can
    cancel that attribute for a particular relation, using the NO
    qualifier. The NO qualifier of the dtr-clause is available when
    you are changing a definition with the CHANGE FIELD or CHANGE
    RELATION statement. The NO qualifier is not used with the dtr-
    clause of DEFINE FIELD, DEFINE RELATION, and DEFINE VIEW.