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QBD*: a graphical query language with recursion

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3 Author(s)
M. Angelaccio ; Dipartimento di Ingegneria Elettronica, Roma II Univ., Italy ; T. Catarci ; G. Santucci

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+, which are the only languages allowing recursive queries to be expressed graphically are compared

Published in:

IEEE Transactions on Software Engineering  (Volume:16 ,  Issue: 10 )