Question

Consider the database scheme given in Question No 2.
i- Calculate the query cost of the given two relational queries.
ii- Write SQL query for both relational queries.
a) PNAME (((sCITY!= ‘Rawat’(Customer))⋉CID(Order))⋈OID(soquantity!=3 (Invoice)))
b) PPrice(sP.PID=I.PID^O.OID=I.OID(((sPrice>30(Product))x Invoice))x(soid!=3 (Order)))

Answer 1

it's not clear to me

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