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Issue No. 10 - October (1990 vol. 16)
ISSN: 0098-5589
pp: 1150-1163
<p>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 +/, which are the only languages allowing recursive queries to be expressed graphically are compared.</p>
QBD*; graphical query language; recursion; databases; standard user interface; Query by Diagram*; conceptual data model; graphical user interfaces; information retrieval; query languages

M. Angelaccio, G. Santucci and T. Catarci, "QBD*: A Graphical Query Language with Recursion," in IEEE Transactions on Software Engineering, vol. 16, no. , pp. 1150-1163, 1990.
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