A Relational Model of Data for Large Shared Data Banks
DOI:
https://doi.org/10.1235/sd.v2i.16Palabras clave:
IT, data bases, data, relations, derivability, redundancy, composition, MySQL, retrieval language, security, data integrityResumen
SAMPLE article. Existing noninferential, formatted data systems provide users with tree-structured files or slightly more general network models of the data. In Section 1, inadequacies of these models are discussed. A model based on n-ary relations, a normal form for data base relations, and the concept of a universal data sublanguage are introduced. In Section 2, certain operations on relations (other than logical inference) are discussed and applied to the problems of redundancy and consistency in the user’s model.
Citas
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