Generalized Query-By-Rule: a heterogeneous database query language (original) (raw)

Abstrae~This paper describes the design and implementation of a high-level query language called Generalized Query-By-Rule (GQBR) which supports retrieval, insertion, deletion and update operations. This language, based on the formalism of database logic, enables the users to access each database in a distributed heterogeneous environment, without having to learn all the different data manipulation languages. The compiler has been implemented on a DEC 1090 system in Pascal. Query language Heterogeneous distributed databases Database logic cL 1~.,3 ~ A