Crystal reports: Can we use two different queries in a report

We cannot use two queries in a report unless we make a join between those two queries.
In this case crystal reports will make cartesian product as that of the database makes cartesian product while using two tables without having any join between them.

Solution to use two different queries in a report:
                                                                       We can acheive it by an option called Sub-report.
Sub report is a report which is created normally as any other report, and it can be included in the calling report.once inserted (using insert option) the sub report will stay inside the main report though we delete the actual report which is about to be inserted as sub report and can be treated single report.