Network Model (Database): Database Model, Charles Bachman, CODASYL, Hierarchical Model, Tree Data Structure, Information Management System, Relational Model, RDM Server - Couverture souple

 
9786130902506: Network Model (Database): Database Model, Charles Bachman, CODASYL, Hierarchical Model, Tree Data Structure, Information Management System, Relational Model, RDM Server
Couverture souple
ISBN 10 : 6130902506 ISBN 13 : 9786130902506
Editeur : Betascript Publishing, 2010

Synopsis

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The network model is a database model conceived as a flexible way of representing objects and their relationships. Its distinguishing feature is that the schema, viewed as a graph in which object types are nodes and relationship types are arcs, is not restricted to being a hierarchy or lattice.Where the hierarchical model structures data as a tree of records, with each record having one parent record and many children, the network model allows each record to have multiple parent and child records, forming a generalized graph structure. This property applies at two levels: the schema is a generalized graph of record types connected by relationship types (called set types" in CODASYL), and the database itself is a generalized graph of record occurrences connected by relationships (CODASYL "sets"). Cycles are permitted at both levels. "

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Éditeur
Betascript Publishing
Date d'édition
2010
Langue
anglais
ISBN 10 
6130902506
ISBN 13 
9786130902506
Reliure
Broché
Nombre de pages
68
Éditeur
Surhone Lambert M., Timpledon Miriam T., Marseken Susan F.
Coordonnées du fabricant
non disponible
Personne responsable
non disponible