A system includes reception, from a client device, a database query over a first data source and a second data source, the first data source comprising a first linking entity and the second data source comprising a second linking entity, the first linking entity identified by two or more columns of the first data source defining a first hierarchy, linking of the first data source and the second data source on the first linking entity and the second linking entity, execution of a blended query on the linked data sources based on the database query to generate a result set, and transmission of the result set to the client device.