student takes ID ID course id sec id name dept name tot_cred semester vear grade section course department course id sec id semester Course id advisor title dept name id dept_name building budget vear time_slot credits building гоот_литber time_slot_id time slot id day start time end_time prereq instructor classroom Course id REereg id building room_number capacity пате dept_name salary teaches ID Course id sec id semester ear Figure 2.9 Schema diagram for the university database.

Np Ms Office 365/Excel 2016 I Ntermed
1st Edition
ISBN:9781337508841
Author:Carey
Publisher:Carey
Chapter7: Developing An Excel Application
Section: Chapter Questions
Problem 3RA
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Question

Consider the advisor relation shown in the schema diagram in Figure 2.9, with
s_id as the primary key of advisor. Suppose a student can have more than one
advisor. Then, would s_id still be a primary key of the advisor relation? If not,
what should the primary key of advisor be?

student
takes
ID
ID
course id
sec id
name
dept name
tot_cred
semester
vear
grade
section
course
department
course id
sec id
semester
Course id
advisor
title
dept name
id
dept_name
building
budget
vear
time_slot
credits
building
гоот_литber
time_slot_id
time slot id
day
start time
end_time
prereq
instructor
classroom
Course id
REereg id
building
room_number
capacity
пате
dept_name
salary
teaches
ID
Course id
sec id
semester
ear
Figure 2.9 Schema diagram for the university database.
Transcribed Image Text:student takes ID ID course id sec id name dept name tot_cred semester vear grade section course department course id sec id semester Course id advisor title dept name id dept_name building budget vear time_slot credits building гоот_литber time_slot_id time slot id day start time end_time prereq instructor classroom Course id REereg id building room_number capacity пате dept_name salary teaches ID Course id sec id semester ear Figure 2.9 Schema diagram for the university database.
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