Sometimes, you will find that you have obtained recordsets which are not exactly what you need. This recipe shows various ways of combining them.
To use this recipe, you need to have two or more recordsets for the same model.
Here is the way to achieve common operations on recordsets:
result = recordset1 + recordset2
result = recordset1 | recordset2
result = recordset1 & recordset2
The class for recordsets implements ...