Expert answer:Database Design/SQL Worksheet

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section8_homework.doc

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Section 8
Vocabulary – Directions: Identify the vocabulary word for each definition below.
1.
A constraint or data restriction that results from
the time dimension.
Refers to a relationship that may or may not be
transferable, depending on time.
Property of a relationship where an instance of
A is related to an instance of B, and the
association cannot be moved to another instance
of B
2.
3.
1. Speeding Tickets
Each police officer may issue speeding tickets to motorists in an assigned area. Originally, the
attribute date was modeled as part of the SPEEDING TICKET entity. However, the city police
department wants to see if there is a relationship between weather and the frequency of
speeding tickets — do people drive faster on nice sunny days? Are there more tickets in hot
weather or cool weather? Does the ERD have to be modified for this new requirement?
Traffic Officer
#ID
*precinct
*
2. Examine the ERD that represents classroom assignments for different exams.
a. Why is start time part of the UID of ASSIGNMENT?
b. Name at least three time-related constraints.
3. When a student’s grade is changed, we need to record information on the teacher who changed
the grade and the reason for the change.
Start with the ENROLLMENT entity.
Which is the resolution of the M:M between STUDENT & CLASS.
STUDENT
ENROLLMENT
#StudentID
#CRN
#SemesterID
oGrade
CLASSES
…
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