The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
Database abstractions: aggregation and generalization
ACM Transactions on Database Systems (TODS)
View representation in logical database design
SIGMOD '78 Proceedings of the 1978 ACM SIGMOD international conference on management of data
A Data Base Management System with an E-R Conceptual Model
Proceedings of the 1st International Conference on the Entity-Relationship Approach to Systems Analysis and Design
Entity-Relationship Model in the ANSI/SPARC Framework
ER '81 Proceedings of the Second International Conference on the Entity-Relationship Approach to Information Modeling and Analysis
An introduction to database systems (The Systems programming series)
An introduction to database systems (The Systems programming series)
VLDB '81 Proceedings of the seventh international conference on Very Large Data Bases - Volume 7
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To ensure data consistency, existence dependencies between records must be preserved when the records are updated. It is necessary to identify such dependencies when the system is designed, so that update operations can be performed correctly. This paper presents a new look at existence dependencies in databases. It identifies a set of basic update rules that can be incorporated into a database management system (DBMS) to preserve existence dependencies between records. The paper shows that the existence dependencies supported by other existing commercially available DBMSs can be defined precisely in terms of the basic rules. Furthermore, a combination of these basic rules captures new existence dependency semantics that are not handled by the commercially available systems. This paper also discusses solutions to the "interference" problems associated with closely related records. These interference problems have never been discussed in the literature before, but are important to system operations.