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
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Some queries on a relational database are analyzed. This analysis results in new concepts for a high-level data manipulation anguage. In the proposed language the cardinal number concept from set theory is applied, using semantic information on the contents of a database. Each query formulation in this language consists of a small number of easily manageable expressions. This means that the simple relational data structures also are reflected in the programs which operate on these structures.