ERROL: An Entity-Relationship, Role Oriented, Query Language.
- SourceAvailable from: Michele Angelaccio[Show abstract] [Hide abstract]
ABSTRACT: A system to query databases using diagrams as a standard user interface is proposed. The system, called Query by Diagram* (QBD*), makes use of a conceptual data model, a query language on this model, and a graphical user interface. The conceptual model is the entity-relationship model. The query language, whose expressive power allows recursive queries, supports visual interaction. The main characteristics of the interface are ease of use and the availability of a rich set of primitives for schema selection and query formulation. The expressive power of QBD* and G<sup>+</sup>, which are the only languages allowing recursive queries to be expressed graphically are comparedIEEE Transactions on Software Engineering 11/1990; 16(10-16):1150 - 1163. DOI:10.1109/32.60295 · 2.29 Impact Factor
Article: QBD *: A Fully Visual Query System1[Show abstract] [Hide abstract]
ABSTRACT: The need of a friendly man-machine interaction is becomingcrucial for a large variety of applications, in particular, thoserequiring frequent extraction of information from the database.Experience suggests that traditional query languages are notfriendly enough for the casual user: she/he is requested toformulate queries in a textual language, without any iconic orspatial clues to help the querying process. A new generation oflanguages (visual languages) has been recently investigated,...
- Proceedings of the 3rd Int. Conf. on Entity-Relationship Approach (ER'83); 01/1983