Embodiments of the present invention provide methods for constructing a database abstraction model that includes logical fields that map to a logical table. The logical table is constructed using data extracted from multiple, differently formatted physical tables. The logical table allows logically related data stored in multiple databases to appear as data from a single table. Relationships between data stored in multiple, differently formatted databases are maintained and logical fields that include multiple access methods that map to the multiple databases are replaced with a single access method that maps to the logical table. Data relationships that are defined for the database abstraction model are modified to reflect the logical table.