$[$#$3]$ Functional Dependency Exercise $(2$ pts$.)$

PROJECT$/$EMPLOYEE

PROJ$\_$NUM PRJ$\_$NAME EMP$\_$NUM EMP$\_$NAME JOB$\_$CLASS CHR$\_$HOUR HOURS

PROJ$\_$NUM: Project number

PRJ$\_$NAME: Project name

EMP$\_$NUM: Employee number

EMP$\_$NAME: Employee name

JOB$\_$CLASS: Job class

CHR$\_$HOUR: Charge hours $($hourly charge$)$

HOURS: Work hours

Note: The charge hour attribute $($CHR$\_$HOUR$)$ represents the employee$$s hourly charge and it can be decided by the employee$$s job class. Employees can work for different projects and each project$-$work hour is traced. A project needs many employees.

$[$a$]$ Identify the primary key$($s$)$