By M. M. Astrahan, D. D. Chamberlin
Communications of the ACM,
October 1975,
Vol. 18 No. 10, Pages 580-588
10.1145/361020.361215
Comments
The relational model of data, the XRM Relational Memory System, and the SEQUEL language have been covered in previous papers and are reviewed. SEQUEL is a relational data sublanguage intended for ad hoc interactive problem solving by non-computer specialists. A version of SEQUEL that has been implemented in a prototype interpreter is described. The interpreter is designed to minimize the data accessing operations required to respond to an arbitrary query. The optimization algorithms designed for this purpose are described.
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