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Codd defined the relational algebra [E.F. Codd, Communications of the ACM 13 (1970) 377–387; E.F. Codd, Relational completeness of data base sublanguages, in Data Base Systems, R. Rustin, Ed., Prentice-Hall (1972) 65–98] as the algebra with operations projection, join, restriction, union and difference. His projection operator can drop, permute and repeat columns of a relation. This permuting and repeating of columns does not really add expressive power to the relational algebra. Indeed, using the...
Codd defined the relational algebra [E.F. Codd,
(1970) 377–387;
E.F. Codd, Relational completeness of data base sublanguages, in , R. Rustin, Ed.,
Prentice-Hall (1972) 65–98] as the
algebra with operations projection, join, restriction, union and
difference. His projection operator can drop, permute and repeat
columns of a relation. This permuting and repeating of columns does
not really add expressive power to the relational algebra. Indeed,
using the join operation,...
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