Raghuramkrishnan Exercise-4.3 question 11 page no-127 Relational Algebra

Question

Suppliers(sid, sname, address)

Parts(pid, pname, color)

Catalog(sid, pid, cost)

Find the pids of the most expensive parts supplied by suppliers named Yosemite Sham

Comments

pls check whether my expression is correct or not

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excellent

Answer 1

Ans: 

References: https://www.cs.colostate.edu/~iray/teach/cs430/soln2

Answer 2

According to me this will also give right answer