MySQLSQL and PostgreSQL permit to define the same reactive and referential constraints. True Fabe we consioer the taoie teacning Deiow, cneck ait statements tnat are irue, we consider an ideal DBMS that would enforce all reactive constraints. CREATE TABLE Teaching ( Profld INTEGER, CrsCode CHAR (6), Semester CHAR (6). PRIMARY KEY (CrsCode, Semester), FOREIGN KEY (CrsCode) REFERENCES Course. FOREIGN KEY (Profid) REFERENCES Professor (ld)) If we update a semester in Teaching. nothing happens in Professor: If we delete a course (CrsCode) in Course, we set to null the value of Crscode int Teaching. If we delete a professor in Professor, nothing happens in Teaching If we delete a course (Crscede) in Course, we delete the data about this course Question 10 (10 points) A view exists physically. True False