Relational Algebra (50 pts): Consider the following database schema that keeps track of Sailors, Boats and the boats reserved by sailors.
Sailors(sid, sname, rating, age)
Boats(bid, bname, color)
Reserves(sid, bid, date)
Keys are underlined in each relation. Specify the following queries in Relational Algebra using above database schema.
(a) find names of sailors who have reserved at least one boat
(b) find sid's of sailors who have reserved a red and a green boat
(c) find names of sailors who have reserved boat #103
(d) find sid's of sailors who have not reserved boats
(e) find names of sailors who made at least 3 reservations
(f) find the name of sailors with the highest rating
(g) find the name and age of oldest sailors
(h) find the age of youngest sailor for each rating level
(i) find the names of sailors who reserved more red boats than green
(j) find names of sailors who have reserved all the boats