Methods and apparatus, including computer program products, are provided for receiving an indication of a defined outer join to enable obtaining a first database table at a first database and a second database table at a second database; sending a first request to the first database to obtain the first database table; sending a second request to the second database to obtain the second database table; receiving, in response to the first and second requests, each of the first and second database tables; performing an outer join on the received first and second database tables, the outer join forming an output database table; and providing the output database table.