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Relational Algebra

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Raghuramkrishnan Exercise-4.3 question 11 page no-127 Relational Algebra
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Consider the relations r1(P, Q, R) and r2(R, S, T) with primary keys P and R respectively. The relation r1 contains 2000 tuples and r2 contains 2500 tuples. The maximum size of the join r1⋈ r2 is equal to r2⋈ r1 true or false?
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aditi19 asked May 7, 2019
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Raghuramkrishnan Exercise-4.3 page-127
Given relation catalog(sid, pid, cost) Find pairs of sids such that the supplier with the first sid charges more for some part than the supplier with the second sid what is the relational algebra expression for this?
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