Supplier (sid, sname, city) Product (pid, pname, color) Catalog (sid, pid, price) (a): Write an SQL query for the following: Find names of products which have green color and are priced over $25. (b):...

Supplier (sid, sname, city)

Product (pid, pname, color)

Catalog (sid, pid, price)

(a): Write an SQL query for the following: Find names of products which have green color and are priced over $25.

(b): Write an RA query which is equivalent to SQL query (equivalent to your answer in (a)).

(c): Draw the query expression tree for your answer in (b)