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

How does Tuple-oriented relational calculus differ from domain-oriented relational  calculus?
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1 Answer

Answer :

The tuple-oriented calculus uses a tuple variables i.e., variable whose only permitted 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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