List the names of users who gave ratings.
select distinct t1.name from useracct as t1 join review as t2 on t1.u_id = t2.u_id
Include the ratings that they gave as well.
select t1.name, t2.rating from useracct as t1 join review as t2 on t1.u_id = t2.u_id
Order by highest to lowest rating.
select t1.name from useracct as t1 join review as t2 on t1.u_id = t2.u_id order by t2.rating desc
Who gave the highest rating?
select t1.name from useracct as t1 join review as t2 on t1.u_id = t2.u_id order by t2.rating desc limit 1