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[4 pts] Using the relation Sells(bar, beer, price), find the bars that sell two different beers at the same price. Express your solution in Relational
[4 pts] 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. 4, [2 pts] Draw your relational algebra solution from Problem #3 as an expression tree
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