Explain step by step Using the following requirements .'A student shall take many courses" and "A course shall have many students"'A course shall have at least one exam and "An exam shall be created for only one course'• 'A student shall get only one grade per exam' and "A grade -- from a specific exam -- shall be given to many students"Given the followina constraints:student FK NN, course FK (both of them implement ON DELETE SET NULL ON UPDATE CASCADE in Enrollment table)course FK NN (implements ON DELETE CASCADE ON UPDATE CASCADE in Exam table)student FK NN, exam FK (both of them implements ON DELETE SET NULL ON UPDATE CASCADE in Grade table)Based on the data given above, which of the following statements won't work?d. Deleting a course from the course table tat exists in the chrollment tableb. Uodatina an exam from the Exam table that exists in the Grade tablec. Deleting a student from the Student table that exists in the Enrollment table• d. Updating a course from the Course table that exists in the Enrollment table

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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Explain step by step Using the following requirements .

'A student shall take many courses" and "A course shall have many students"
'A course shall have at least one exam and "An exam shall be created for only one course'

• 'A student shall get only one grade per exam' and "A grade -- from a specific exam -- shall be given to many students"

Given the followina constraints:

student FK NN, course FK (both of them implement ON DELETE SET NULL ON UPDATE CASCADE in Enrollment table)
course FK NN (implements ON DELETE CASCADE ON UPDATE CASCADE in Exam table)
student FK NN, exam FK (both of them implements ON DELETE SET NULL ON UPDATE CASCADE in Grade table)

Based on the data given above, which of the following statements won't work?

d. Deleting a course from the course table tat exists in the chrollment table

b. Uodatina an exam from the Exam table that exists in the Grade table

c. Deleting a student from the Student table that exists in the Enrollment table

• d. Updating a course from the Course table that exists in the Enrollment table

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