DATABASE SYSTEM

Exercise 1.4 Determine for each of the following constraints whether they are an "implicit constraint", an "explicit constraint", or a "semantic constraint": - A student cannot register for more than 20 courses per semester - Each relation contains at least 1 attribute - The attribute ENROLLMENT.Studentld refers to STUDENT.Id - The number of values inside a tuple of a relation is equal to the number of attributes in that relation - The domain of STUDENT.Id are integers from 0 to 28 - An employee cannot be their own manager - The attribute COMPANY.RegistryNumber is the primary key of COMPANY. - The value of primary keys of a relation must be distinct for each distinct tuple