Question: 3) Using the relation Sells(bar, beer, price), find the bars that sell two different beers at the same price. Express your solution in Relational Algebra.

3) Using the relation Sells(bar, beer, price), find the bars that sell two different beers at the same price. Express your solution in Relational Algebra.

4) Draw your relational algebra solution from Problem #3 as an expression tree.

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