The SpecialField object represents a special field in a table of external database. The object SpecialField always belongs to the Table::SpecialFields collection. Access to collection items is possible both by name and by internal number. The collection provides continuity of field internal numbers. Persistence of internal number is guaranteed within a session of external database. Adding special fields to and removing special fields from the collection is not possible. If an ODBC data source does provide information about special fields in a table, the collection will be empty.
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