- student(sid, sname, sex, age, year, gpa) [Year is a number between 1 and 5]. - dept(dname, numphds) - prof(pname, dname) - course(cno, cname, dname) [Course numbers are unique within departments.] - major(dname, sid) - section(dname, cno, sectno, pname) [Associates an instructor to a section.] - enroll(sid, grade, dname, cno, sectno) [Associates students to sections.] a. Write an SQL assertion statement to check the constraint that a student cannot enroll in two sections of the same course. b. Write an SQL assertion statement to check the constraint that every section must have at least one student. Explain how this assertion might relate to a total participation constraint on a corresponding entity-relationship diagram. c. The university wants to make some of this information available to a student's resident advisor. The advisor should be able to see the number of classes a student is enrolled in, but not the actual classes or the grades. Create a view that provides this information