QUESTION 13 Convert the following ERD into relational schema. Show different relations that will result along with their attributes and identify clearly their primary and foreign keys. Student Instructor studenti PK instructorid student Name instructorName student Adress instructorTitle GPA teach Course courselD take courseTitle course Credit QUESTION 15 Given the following table: Highschooler(student ID, studentName, grade); Write in PL/SQL a row level trigger named graduation. This trigger should be fired after updating the column grade of the above table. Once it is fired, it should delete students whose new grades exceed 12