Proc. of the NYU symposium on user interfaces on Human factors and interactive computer systems
The category concept: an extension to the entity-relationship model
Data & Knowledge Engineering
A graphical query language for entity-relationship databases
Proc. of the third international conference on Entity-relationship approach to software engineering
Extending the database relational model to capture more meaning
ACM Transactions on Database Systems (TODS)
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
Communications of the ACM
LSL: a Link and Selector Language
SIGMOD '76 Proceedings of the 1976 ACM SIGMOD international conference on Management of data
An Entity-Relationship Algebra
Proceedings of the First International Conference on Data Engineering
SNAP: A Graphics-based Schema Manager
Proceedings of the Second International Conference on Data Engineering
GORDAS: A Formal High-Level Query Language for the Entity-Relationship Model
ER '81 Proceedings of the Second International Conference on the Entity-Relationship Approach to Information Modeling and Analysis
A Graphical Query Facility for ER Databases
Proceedings of the Fourth International Conference on Entity-Relationship Approach
A Relationally Complete Query Language for an Entity-Relationship Model
Proceedings of the Fourth International Conference on Entity-Relationship Approach
Cupid: a graphics oriented facility for support of non-programmer interactions with a data base.
Cupid: a graphics oriented facility for support of non-programmer interactions with a data base.
ACM SIGMIS Database
Semantics of update operations for an extended entity-relationship model
CSC '88 Proceedings of the 1988 ACM sixteenth annual conference on Computer science
MashQL: a query-by-diagram topping SPARQL
Proceedings of the 2nd international workshop on Ontologies and information systems for the semantic web
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The Entity-Category-Relationship (ECR) model extends the Entity-Relationship (ER) model with the concepts of subclass and generalization categories. In this paper a graphical representation of the ECR model and its application as the basis for an interactive query language are discussed. The proposed query language is based on algebraic operators that can be used to transform an ECR diagram so that it represents a desired query. Semantics of the algebraic operators are formally defined. A method of implementing the graphical ECR interface for accessing relational database systems is proposed.