MIS 3353
Quiz 2
Nov. 21, 2002
Name __________________________________________
Part I
Multiple Choice (30 pt)
Mark all correct answers. Explain any answers that you need to.
1
A relational database connects tables with
a) Pointers
b) Indexes
c) Keys and Foreign Keys
d) Hashed connections
2
In a SQL SELECT statement the phrase
GROUP BY Name, Major HAVING City = ‘Norman”
a) Generates an error
b) Produces only groups from Norman
c) Produces a table with one record for each student and major
d) Produces only one record for Norman
3
In a SQL SELECT statement the phrase
FROM (SELECT Name FROM STUDENT) S, STUDENT
a) Generates an error
b) Renames the student table and calls it S
c) Creates a new (virtual) table with nothing but student names in it and calls it S
d) Creates a table called FROM
4
You have the table STUDENT (ID, Name, Major). Students may have more than one major. To list
all students who are NOT MIS majors you should include which statement in your SQL query
a) SELECT * FROM STUDENT WHERE Major <> ‘MIS’
b) SELECT * FROM STUDENT GROUP BY Major HAVING Major <> ‘MIS”
c) SELECT * FROM STUDENT WHERE ID NOT IN (SELECT * FROM STUDENT HAVING Major =
‘MIS’)
d) SELECT * FROM STUDENT WHERE ID NOT IN (SELECT ID FROM STUDENT WHERE Major
= ‘MIS’)
5
A 3nf violation means
a) An attribute in the table can have several values in one record
b) An attribute in the table depends on only one part of a concatenated key
c) An attribute in the table belongs in another entity
d) The table has no primary key
6
Normalization
a) Identifies incorrect referential integrity
b) Identifies incorrect placement of attributes
c) Identifies incorrect cardinality
d) Identifies incorrect foreign keys
7
Normalized databases
a) Are designed for efficient update
b) Are designed for efficient retrieval
c) Remove data redundancy
d) Remove key/foreign key redundancy
8
An index
a) Makes retrievals faster
b) Increases the space needed for the database
c) Makes updates faster
d) Is always generated for a primary key
9
A pointer in a data structure
a) Contains a primary key value
b) Contains an attribute value
c) Contains a foreign key value
d) Contains a physical location
INSTRUCTOR
CLASS
10 The data model above represents a 1:M relationship between instructor and classes taught. You
wish to speed up the process of looking up INSTRUCTOR.Name whenever you look up class. You
can
a) Put Class Name in the INSTRUCTOR table
b) Put Instructor Name in the CLASS table
c) Index the Name attribute in the INSTRUCTOR table
d) Index the Name attribute in the CLASS table
Part II: Completion (40 pt.)
1.
STUDENT (Student#, StudentName, StudentPhone, TitleOfClassTaken)
Circle the lowest normalization error: 0nf, 1nf, 2nf, 3nf, no error.
Describe the error:
TitleOfClassTaken is multi-valued
Correct the error:
STUDENT( Student#, StudentName, StudentPhone)
CLASS( Class#, TitleOfClass)
STUDENT-CLASS( Student# , Class# )
2.
ORDER(Order#, Date, Customer, CustomerAddress)
Circle the lowest normalization error: 0nf, 1nf, 2nf, 3nf, no error.
Describe the error:
Customer and CustomerAddress belong to another table
Correct the error:
ORDER( Order# , Date, Customer# )
CUSTOMER( Customer# , Customer, CustomerAddress)
3.
STUDENT
(150)
Query
Use the data model below to calculate the number of records accessed in each of the tables.
Given an instructors name, find all of the students enrolled in her/his classes.
SECTION
(30)
STUDENT-SECTION
(600)
Table:
INSTRUCTOR
SECTION
Size:
Attribute
Index?
15
Name
N
7.5
INSTRUCTOR
(15)
STUDENT
30
Instr#
N
STUDENTSECTION
600
Sec#
Y
1*30
1*2*20
1*2*20*1
150
Stu#
Y
4.
The OU Auto Repair Shop wants an information system to track its operations It tracks vehicle
make, model, year and vehicle identification number (VIN) for each vehicle it repairs. Each time a
customer brings a vehicle in the system creates a repair order that captures date, vehicle make, model,
color, and vehicle identification number (VIN) for the vehicle. Different customers may bring the same
vehicle in for repair at different times. Only one customer is listed on any repair order, however. The
system keeps customer name, contact phone, and address for individuals listed on the repair order.
Businesses may bring in vehicles, and in that case the system needs customer name (person who
brought in the vehicle) business name, contact phone, and business account number.
The repair order lists repair codes, description and standard number of hours for each repair task
requested. The repair information comes from the Chilton standard repair table that lists codes and
standard times for most repairs. Each order can include several different repair requests. The same
repair (for example, replace a tire) may occur several times on a single order. The system must track
employee ID, name and location for the employee that does each repair task.
The system must also track parts used. Each part can contain other parts. A part may be contained in
several other parts. The system tracks ID, description and price for each part in inventory.
Draw an E-R diagram for this situation. Include keys, foreign keys, cardinality and referential integrity
indicators.
BUSINESSCUSTOMER
CUSTOMER
Cust# (PK)
Cust# (PK)
BusinessName
Address
Account
d
VEHICLE
VIN (PK)
Make
Model
Year
ORDER
Ord# (PK)
VIN (FK)
Cust# (FK)
Date
PARTORDERED
Ord# (PK)
ID# (PK)
Quantity
REPAIRORDERED
Num (PK)
Code# (FK)
Ord# (FK)
Emp# (FK)
REPAIR
Code# (PK)
Description
Time
CUSTOMER
Cust# (PK)
Name
ContactPhone
EMPLOYEE
Emp# (PK)
Name
Location
PART
ID# (PK)
Description
Price
PART-CONTAINS
ID# (PK)
ContainsID# (PK)
Part II: SQL (30pt)
Course
3013
3013
3013
3033
3033
3033
3033
3353
3353
3353
3363
3363
3363
3373
3373
3373
4663
4663
4663
4663
Sec
001
002
004
002
003
901
902
001
002
901
001
002
003
002
003
004
900
902
903
904
Title
C Programming
C Programming
C Programming
Visual Basic
Visual Basic
JAVA
JAVA
Databases
Databases
Databases
Infrastructure
Infrastructure
Infrastructure
Systems Theory
Systems Theory
Systems Theory
Systems Project
Systems Project
Systems Project
Systems Project
SCHEDULE
Hours
Days
8:30 AM M,W,F
1:30 PM T,R
3:00 PM T,R
3:00 PM T,R
3:00 PM M,W
6:30 PM W
4:30 PM M,W
10:30 AM T,R
12:00 PM T,R
4:30 PM T,R
1:30 PM M,W
1:30 PM T,R
3:00 PM M,W
9:00 AM T,R
1:30 PM M,W
3:00 PM M,W
6:30 PM M
6:30 PM M
4:30 PM M
4:30 PM M
Instructor
Ferguson
Warner
Warner
Ratwatte
Ratwatte
Kemp
Ratwatte
Carte
Carte
Carte
Carter
Croes
Warner
Miranda
Shaft
Shaft
Kemp
Schwarzkopf
Price
Ferguson
Room
AH 100
AH 101
AH 101
AH 100
AH 100
AH 101
AH 100
AH 311
AH 311
AH 315
AH 101
AH 104
AH 104
AH 101
AH 112
AH 112
AH 150
AH 150
AH 255
AH 150
Max Enrolled
35
25
35
23
35
30
35
35
35
30
25
15
35
30
30
30
30
30
30
25
30
30
30
24
30
25
30
25
30
28
30
20
24
24
24
18
18
18
18
18
PREREQUISITE
Course PreCourse
3033
3013
3033
3353
3353
2113
3353
3013
3363
3353
3373
3353
4663
3033
4663
3353
4663
3363
4663
3373
Assume you have the tables above. Write SQL to execute the following queries.
1.
List Course, Title, Number-of-sections, Number-of-students-enrolled for all courses that meet on
Mondays and have at least 3 sections offered.
SELECT Course, Title, Count(*), Sum(Enrolled)
FROM Schedule
WHERE Days LIKE ‘*M*’
GROUP BY Course, Title
HAVING Count(*) >=3;
2.
List Instructor and Number-of-students-enrolled for all instructors who do NOT teach on Mondays.
SELECT Instructor, Sum(Enrolled)
FROM Schedule
WHERE Instructor NOT IN
(SELECT Instructor FROM Schedule WHERE Days LIKE ‘*M*’)
GROUP BY Instructor
3.
List each Instructor, Course, Number-of-students-enrolled for all of that instructors sections of the
course, and Number-of-students-enrolled for all sections of that course.
SELECT Instructor, Course, Sum(Enrolled), T.Total
FROM Schedule, (SELECT Course, Sum(Enrolled) AS Total FROM Schedule GROUP BY
Course) T
WHERE Schedule.Course = T.Course
GROUP BY Instructor, Course, T.Total
4.
List each Instructor, Total-Number-of-Students-Enrolled in all classes for the instructor, and the
Total-Number-of-Students-Enrolled in all classes together.
SELECT Instructor, Sum(Enrolled), T.Total
FROM Schedule, (SELECT Sum(Enrolled) AS Total FROM Schedule) T
GROUP BY Instructor, T.Total
5.
List each Title and Prerequisite-Title for all courses that have prerequisites.
SELECT C.Title, Pre.Title
FROM Schedule C, Schedule Pre, Prerequisite
WHERE C.Course = Prerequisite.Course
AND Prerequisite.PreCourse = Pre.Course