Write the following SQL queries

Here are the SQL tables Student(snum, sname, major, level, age) Class(name, meets_at, room, fid) Enrolled(snum, cname) Faculty(fid, fname, deptid) Grade(snum, cname, score) Prerequisite(name, prereqcname) Find class names with no prerequisites. Find all prerequisite for class 'Operating System Design' and 'Multivariate Analysis'. Find all class names with at least 2 prerequisite. . Find the youngest student by each department and major if their average grade score is more than 80 and order them by their name. . Add 5 to the score of every student who has grades for database systems, but ensure no one's score goes beyond 100