@MISC{Codd69storedin, author = {E F. Codd}, title = {STORED IN LARGE DATA BANKS}, year = {1969} }

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Abstract

ABSTRACT: The large, integrated data banks of the future will contain many relations of various degrees in stored form. It will not be unusual for this set of stored relations to be redundant. Two types of redundancy are defined and discussed. One type may be employed to improve accessibility of certain kinds of information which happen to be in great demand. When either type of redundancy exists, those responsible for control of the data bank should know about it and have some means of detecting any “logical ” inconsistencies in the total set of stored relations. Consistency checking might be helpful in tracking down unauthorized (and possibly fraudulent) changes in the data bank contents.

...eing expounded. An array which represents an n-ary relation R has the following properties: (1) Each row represents an n-tuple of R; (2) The ordering of rows is immaterial; (3) All rows are distinct; =-=(4)-=- The ordering of columns is significant - it corresponds to the ordering Sl, S 2, . ..) sn of the domains on which R is defined; (5) The significance of each column is partially conveyed by labeling i...

...rt of the relational view being expounded. An array which represents an n-ary relation R has the following properties: (1) Each row represents an n-tuple of R; (2) The ordering of rows is immaterial; =-=(3)-=- All rows are distinct; (4) The ordering of columns is significant - it corresponds to the ordering Sl, S 2, . ..) sn of the domains on which R is defined; (5) The significance of each column is parti...

... it must be remembered that this particular representation is not an essential part of the relational view being expounded. An array which represents an n-ary relation R has the following properties: =-=(1)-=- Each row represents an n-tuple of R; (2) The ordering of rows is immaterial; (3) All rows are distinct; (4) The ordering of columns is significant - it corresponds to the ordering Sl, S 2, . ..) sn o...

...ar representation is not an essential part of the relational view being expounded. An array which represents an n-ary relation R has the following properties: (1) Each row represents an n-tuple of R; =-=(2)-=- The ordering of rows is immaterial; (3) All rows are distinct; (4) The ordering of columns is significant - it corresponds to the ordering Sl, S 2, . ..) sn of the domains on which R is defined; (5) ...