Explain domain-oriented relational calculus?, Database Management System

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How does Tuple-oriented relational calculus vary from domain-oriented relational calculus?

The tuple-oriented calculus uses a tuple variables i.e., variable whose only allowed values are tuples of that relation. E.g. QUEL

The domain-oriented calculus has domain variables i.e., variables that range over the underlying domains instead of over relation. E.g. ILL, DEDUCE.

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