I need to generate a report, that sums up different transaction types. i.e., I have an ORDERS FILE, PARTS DETAILS FILE and LABOR DETAILS FILE. Within the labor category, there are 3 types: INTERNAL, EXTERNAL and MAINTENANCE. Within the parts category, there are 3 types: TIRES, FLUIDS and PARTS. The report needs to total each category type, over all the orders, by a specific ID#. I have tried several queries, but all fail when there is no record in one of the details files for that particular category type (ex: if an order has no TIRES, then there is no detail record for it, so the summation query fails to return any data). Is there some trick I am missing? Thanks.