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The EntityRelationship Approach and the Information Resource
Why Use a Graphical Conceptual Schema as a User Interface to
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abstraction access paths activity ADABAS aggregation algorithm ANSI ANSI IRDS application arity assertion associated attributes Batini Batini Editor cardinality clause complex component Computer concept conceptual model conceptual schema constraints construct corresponding data base data model Database Design Database Systems DBMS defined definition delete dependent dependent segment described diagram domain element-of Elsevier Science Publishers entity sets entity type ENTITY-RELATIONSHIP APPROACH Entity-Relationship Model environment example existing external schemas Figure formal function graphical hierarchy icon implementation information systems insert instance integration invoice IRDS knowledge representation logical method methodologies module natural language node object class object-oriented database occurrence operations PList predicate Proc properties Publishers B.V. North-Holland query graph query language record type relational database relational schema relationship type representation represented rules Science Publishers B.V. selection semantic sequence diagram specific structure subclasses traversal tuple update user interface variables weak entity