A relational model of data for large shared data banks
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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An APL version of an information retrieval system used for numerical taxonomy, is shown to have properties suitable for data management by APL users. The data model is that of a table whose columns are named by descriptors, and the data manipulation language is English-like. Statements in the language are strings of executable APL functions with intervening arguments, thus avoiding the limitation in extensibility of non-procedural query languages. Boolean selection predicates are generalized to include executable APL expressions. The system features are presented in detail and extensions are discussed.