Queries with joins, however, are more likely to have coincident attribute names and require explicit differentiation. For example, the primary key of both Addresses and Orders is called id. Qualifying all the field names
R. Angles, и C. Gutierrez. The Semantic Web: Research and Applications, том 3532 из Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2005)
K. Rohloff, и R. Schantz. Proceedings of the fourth international workshop on Data-intensive distributed computing, стр. 35--44. New York, NY, USA, ACM, (2011)
P. Haase, J. Broekstra, A. Eberhart, и R. Volz. International Semantic Web Conference, том 3298 из Lecture Notes in Computer Science, стр. 502-517. Springer, (2004)
R. Vdovjak, P. Barna, и G. Houben. Advanced Information System Engineering, 15th
International Conference, CAiSE 2003, том 2681 из Lecture Notes in Computer Science, Klagenfurt/Velden, Austria, Springer-Verlag, (июня 2003)
P. Haase, J. Broekstra, A. Eberhart, и R. Volz. The Semantic Web - ISWC 2004. Proceedings of the Third
International Semantic Web Conference, том 3298 из Lecture Notes in Computer Science, Hiroshima, Japan, Springer-Verlag, (2004)