A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2011; you can also visit the original URL.
The file type is
Lecture Notes in Computer Science
In order to accomplish independence on the logical data organization, a relational DBMS must be capable of interpreting query language sentences which reference attributes belonging to different relations even if the necessary joins are not explicitly formulated (query inference problem). In this work we propose an SQL extension which supports concise formulation of queries through the dynamic definition of user viewpoints. User viewpoints are perspectives for accessing data; each userdoi:10.1007/bfb0049131 fatcat:qcgv2nbdz5avvkiemddefrfnc4