A Relational Model of Data for Large Shared Data Banks.
E. F. Codd:
A Relational Model of Data for Large Shared Data Banks.
Commun. ACM 13(6): 377-387(1970)@article{DBLP:journals/cacm/Codd70,
author = {E. F. Codd},
title = {A Relational Model of Data for Large Shared Data Banks},
journal = {Commun. ACM},
volume = {13},
number = {6},
year = {1970},
pages = {377-387},
ee = {db/journals/cacm/Codd70.html, http://doi.acm.org/10.1145/362384.362685},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
BibTeX
Abstract
Future users of large data banks must be protected from
having to know how the data is organized in the machine (the
internal representation). A prompting service which supplies
such information is not a satisfactory solution. Activities of users
at terminals and most application programs should remain
unaffected when the internal representation of data is changed
and even when some aspects of the external representation
are changed. Changes in data representation will often be
needed as a result of changes in query, update, and report
traffic and natural growth in the types of stored information.
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 opera-
tions on relations (other than logical inference) are discussed
and applied to the problems of redundancy and consistency
in the user's model.
Copyright © 1970 by the ACM,
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E. F. Codd:
A Relational Model of Data for Large Shared Data Banks (Reprint).
Commun. ACM 26(1): 64-69(1983) BibTeX
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