Consider the E-R diagram for the university database as given below (in figure 1). Answer the following questions:

1. What does the double-lined diamond shape around the relationship set sec_course indicate?

2. Translate the lower part of the University E-R diagram, (which is also shown below in figure 2 ) into a relational database (i.e., translate this part of the E-R diagram into relational schemas.)

(Figure 1)

(Figure 2 below)

course dept inst dept instructor name salary teaches course course id Sec Course title credits prereq prereq id course id department dept name building budget stud dept student ID advisor name tot cred takes grade section time slot sec id. semester sec time slot time slot id day start time end time sec class classroom build in room number capacity