The Entity-Relationship Model

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Excerpt from The Entity-Relationship Model: Toward an Unified View of Data Copyright 1976, Association for Computing Machinery, Inc. General permission te republish, but not for profit, all or part of this material is granted provided that acm's copyright notice is given and that reference is made to the publication, to its date of issue, and to the fact that reprinting privileges were granted by permission of the Association for Computing Machinery. A version of this paper was presented at the International Conference on Very Large Data Bases, Framingham, Mass, Sept. 22-24, 1975. Author's address: Center for Information System Research, Alfred P: Sloan School of Manage ment, Massachusetts Institute of Technology, Cambridge, MA 02139. Aom Transactions on Database Systems, Vol. 1, No. 1, March 1076, Pages 9 - 36. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.