student takes ID course id sec_id semester 1/ear grude HILE depf_name fof_cred Course course id advisor section course id sec_id semester year building TOOM_710 time_slot_id title dept_name department dept_mame building hudget sid 11 Credits time_slot time slot id day start_time end_time instructor classroom prereg course_id prereq_id building YOUT? YO NAN dept_name salari Capacity teaches Course id semester near (5 points) Using the university schema, define a view tot credits (year, num.credits), giving the total number of cred- its taken in each year. Then, explain why insertions would not be possible into this view. Q5: (10 points)