In some cases, you already have a recordset, but only you need to operate on certain records. You can, of course, iterate on the recordset, checking for the condition on each iteration and acting depending on the result of the check. It can be easier, and in some cases, more efficient, to construct a new recordset containing only the interesting records and calling a single operation on that recordset.

This recipe shows you how to use the filter() method to extract recordsets from another one.