Identify which ones of the following constraints are (i) structural, (ii) semantic, (iii) static, (iv) dynamic.
i. A class start time must be before its end time.
ii. A table of students should contain no more than 200 rows.
iii. The mileage of a car can not decrease.
iv. In teaching assignment table that assigns professors to courses, each individual assignment
should correspond to exactly one professor and one course.
i. semantic, static.
ii. semantic, static.
iii. semantic, dynamic.
iv. structural, static. (This is a foreign key constraint.)
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