Consider the following relations:

Student (studentId, studentName, address, age, gender, limitBorrowing)

Borrowing (studentId, bookId, borrowDate, returnDate)

a) Write SQL statement to create a constraint in table Student such that the studentId does not exceed 500.

b) Write SQL statement to create a constraint in table Borrowing such that the returnDate should be greater or equal to the current date of the system.