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database
An operational methodolgy, founded on
predicatecalculus
, dealing with descripitive expressions that are
equivalent to the operations of
relational algebra
.
Codd'sreduction algorithm
can convert from
relational calculus
to
relational algebra
.
Two forms of the relational calculus exist: the
tuplecalculus
and the
domain calculus
.
["An Introduction To Database Systems" (6th ed), C. J. Date,
Addison Wesley].
(1998-10-05)