Implementation of a Structured English Query Language

@article{Astrahan1975ImplementationOA,
  title={Implementation of a Structured English Query Language},
  author={Morton M. Astrahan and Donald D. Chamberlin},
  journal={Commun. ACM},
  year={1975},
  volume={18},
  pages={580-588}
}
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… CONTINUE READING

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