Optimizing the performance of a relational algebra database interface
Communications of the ACM
Implementation of a structured English query language
Communications of the ACM
A relational model of data for large shared data banks
Communications of the ACM
An algebra of relations for machine computation
POPL '75 Proceedings of the 2nd ACM SIGACT-SIGPLAN symposium on Principles of programming languages
Optimization of single expressions in a relational data base system
IBM Journal of Research and Development
Noun-phrase model and natural query language
IBM Journal of Research and Development
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PRTV [6] is a research prototype interactive data base. It is intended for use on its own or as part of a specialist system. The principle objectives are to provide: a) high level flexible data support, b) functional extensibility and c) reasonable efficiency. The prototype is also designed as a method of generating and testing ideas in a wider data base research programme.