Conference Paper

ERROL: An Entity-Relationship, Role Oriented, Query Language.

Conference: Proceedings of the 3rd Int. Conf. on Entity-Relationship Approach (ER'83)
Source: DBLP
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    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 compared
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    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