//need help with some database technologies questions write queries using SQL please, thanks for the assistance

Lets say we have two relations of the form:

R(A,B) = {(0,1),(2,3),(0,1),(2,4),(3,4)}

S(B,C) = {(0,1),(2,4),(2,5),(3,4),(0,2),(3,4)}

Write SQL queries which do the following:

- Joins R and S and computes the max value of C for each A.

- Finds tuples of R which match and unmatch with S.