Title :
A graphical data manipulation language for an extended entity-relationship model
Author :
Czejdo, Bogdan ; Elmasri, Ramez ; Rusinkiewicz, Marek ; Embley, David W.
Author_Institution :
Dept. of Comput. Sci., Houston Univ., TX, USA
fDate :
3/1/1990 12:00:00 AM
Abstract :
A user can formulate database queries and updates graphically, by manipulating schema diagrams. The authors based the graphical data manipulation interface on the entity-relationship (ER) model because of its widespread use and increasing popularity. They use an extended ER model incorporating various forms of generalization and specialization, including subset, union and partition relationships. They call their model the extended conceptual entity-relationship or ECER model. A comparison with other graphical entity-relationship interfaces is included.<>
Keywords :
computer graphics; information retrieval; query languages; relational databases; ECER model; database queries; extended ER model; extended conceptual entity-relationship; extended entity-relationship model; generalization; graphical data manipulation interface; graphical data manipulation language; graphical entity-relationship interfaces; partition relationships; schema diagrams; specialization; subset; union; Computer interfaces; Database languages; Database systems; Displays; Erbium; Formal specifications; Information retrieval; Marine vehicles;
