Tuple-oriented and domain-oriented relational calculus

Differentiates Tuple-oriented relational calculus and domain-oriented relational calculus?

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Tuple oriented relational calculus and domain-oriented relational calculus have following different:

Tuple oriented calculus:

It uses tuple variables, which are variable that only allowed values are tuples of which relation. As like QUEL.

Domain-oriented calculus:

It has domain variables, which are variables such range over the underlying domains in place of over relation. As like ILL and DEDUCE.

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