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Union of R and S : The Union of two relations is a relation that includes all the tuples that are either in R or in S or in both R and S. Duplicate tuples are eliminated.
Cartesian Product: The Cartesian Product is an operator which works on two sets. It combines the tuples of one relation with all the tuples of the other relation.
Example: Cartesian Product
The Union is an operator which works on two sets. It combines the tuples of one relation with all the tuples of the other relation such that there is no duplication.