Specifying queries as relational expressions: the SQUARE data sublanguage
Communications of the ACM
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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A retrieval language for relational data bases is presented and its similarity, both syntactic and semantic, with a particular form of queries in English is shown. A definition of the essential features of the language is given and it is illustrated with examples. Queries in ILL always have a straightforward paraphrase in English.