An introduction to database systems: vol. I (4th ed.)
An introduction to database systems: vol. I (4th ed.)
A relational model of data for large shared data banks
Communications of the ACM
Database Processing
SEQUEL: A structured English query language
SIGFIDET '74 Proceedings of the 1974 ACM SIGFIDET (now SIGMOD) workshop on Data description, access and control
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This paper describes a Block Structured Query Language (BSQL) to be used with relational data bases. The syntax of the language is presented and discussed. Facilities of the language are illustrated by examples of actual queries. In particular we demonstrate the ability of BSQL to obtain useful information from a relational data base that is incomplete. A relational calculus is then presented which forms a basis for a formalism which precisely describes the semantics of BSQL. Finally, comparative examples with other query languages are given.