5. Exercise 2.15 - Consider Figure 2.1. In addition to constraints relating the values of columns in one table to columns in another table, there are also constraints that impose restrictions on values in a column or a combination of columns within a table. One such constraint dictates that a column or a group of columns must be unique across all rows in the table. For example, in the STUDENT table, the Student number column must be unique (to prevent two different students from having the same Student number). Identify the column or the group of columns in the other tables that must be unique across all rows in the table. ( 5 points) 8 Crapter I Databasar and Database Usen STInENT COURSE GRADE REPORT PREREQUISITE Figure 1.2 A database that stores student and courso information