Identify all renters who have viewed all properties, Database Management System

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Consider the subsequent relations

RENTER(rno, fname, lname, address, tel_no, pref_type, max_rent)
VIEWING(rno, pno, date, comment)
PROPERTY_FOR_RENT( pno, street, area ,city, pcode, type, rooms, rent)
Express the subsequent queries in relational algebra.
(i) List the name and comments of all renters who have viewed a property.
(ii) Identify all renters who have viewed all properties along with three rooms.

Ans: (i) Π fname,lname,comment(RENTER VIEWING)
(ii) Π fname,lname ( σ rooms =3 (PROPERTY_FOR_RENT) RENTER VIEWING)

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