If a database supports duplicate records, then you can use a database handle to retrieve only the first record in a set of duplicate records.
如果数据库支持多重记录，你可以通过数据库找回多重记录集中的第一条记录。
2
You can use this method to create multiple, duplicate Recordset, particularly if you want to edit more than one current record in a set of records.
你可以通过使用这个方法来创建多个记录集的复版，特别是当你希望编辑多个记录时。
3
The proposed method partitions record set according to decided attribute values, and then detects approximately duplicate records in each class of decided attribute value.