Question 1: chose the correct answer(s) ( 30degree)
1) All of the following terms are related to databases EXCEPT for:
(a). Data
(b). Search
(c). Character retrieval
(d). Entry
2) Which of the following is generally a benefit of normalisation?
(a). Performance is improved
(b). Insertion anomalies are avoided
(c). Se lection anomalies are avoided
(d). Number of tables is reduced
(e). None of the above.
3) There are two relations X and Y. Relation X has arity 1 and cardinality 2, relation Y has
arity 3 and cardinality 4. Indicate the result of the SQL statement
SELECT COUNT(*)
FROM X,Y.
(The arity of a relation is the dimension of the domain in the corresponding Cartesian product)
(a).
(b).
(c).
(d).
(e).
4
6
8
Cannot be calculated from the information given
None of the above.
4) A lack of normalization can lead to which one of the following problems
(a).
(b).
(c).
(d).
(e).
Lost Updates
Deletion of data
Insertion problems
Deferred ‫ مؤجل‬updates
Deadlock
5) If you had a database with 500 names and addresses of students enrolled at your school and
wanted to know the phone number of one particular student, you would:
(a).
Perform a search of all boys in the database
(b).
(c).
(d).
Sort the database and scroll through the records
Perform a search using the student's name as the criteria
Sort the database in descending order
6) To transform a relation from 2NF to 3NF we must remove which one of the following?
(a).
(b).
(c).
(d).
(e).
All partial-key dependencies
All inverse partial-key dependencies
All repeating groups
All transitive dependencies
None of the above
7) Database Schema is:
(a)The description of a database. Includes descriptions of the database structure and the
constraints that should hold on the database
(b) A diagrammatic display of (some aspects of) a database schema
(c) component of the schema or an object within the schema
(d) Refers to the content of a database at a moment in time
8) Database State:
(a). The description of a database. Includes descriptions of the database structure and
the constraints that should hold on the database
(b). A diagrammatic display of (some aspects of) a database schema
(c). component of the schema or an object within the schema
(d). Refers to the content of a database at a moment in time
9) Conceptual data models :
(a) object-based data models
(b) Provide concepts that are close to the way many users perceive data
(c) Provide concepts that describe details of how data is stored in the computer
(d) (a) and (b) are true
10) Physical data models:
(a) object-based data models
(b) Provide concepts that are close to the way many users perceive data
(c) Provide concepts that describe details of how data is stored in the computer
(d) (a) and (b) are true
11- A recursive relationship is a relationship between an entity and ________ .
A. itself
B. a subtype entity
C. an archetype entity
D. an instance entity
12- Consider two tables: Quran and reciters ( ‫)المقرئين‬, that are related by a “1-to-Many”
relationship. Given this type of relationship, in which table should the corresponding
foreign key be placed?
A. Foreign key needed only in Quran table
B. Foreign key needed only in reciters table
C .Foreign key needed in both tables
D. Composite entity must be added, and then foreign keys will be required in both the Quran
and reciters tables
13- Which of the following indicates the minimum number of entities that must be involved
in a relationship?
A. Minimum cardinality
B. Maximum cardinality
C. ERD
D. database resources
14- Properties that describe the characteristics of entities are called:
A. entities.
B. attributes.
B. identifiers.
D. relationships.
C.
15- Which of the following is NOT a basic element of all versions of the E-R model?
A. Entities
B. Attributes
C. Relationships
D. Primary keys
16-
1Consider the relation schemas as follows.
works(person name, company name, salary);
lives(person name, street, city);
located in(company name, city);
managers(person name, manager name);
where manager name refers to person name.
Find the names of the persons who work for company ’FBC’ (company name=’FBC’).
ِ(A) (Cname(Dept='Math' (Credits=3(Course)))?
(B) Person Name(company_Name=’FBC’(works))?
(C) Person Name ( company_Name=’FBC’(works))?
(D)  Person Name (live (Located_in=’FBC’(works)))?
17- Consider the relation schemas as follows.
R1(Sid,Bid,Date); where Sid is sailor ID, Bid is boat ID, date is Boat reservation
date
S1(Sid,Sname,Rating,Age); Sname is sailor name, Rating is sailor rating, age is
sailor age
Find the names of the Sailors who reserved Bid=’103’
(a) SName(SalorName=’Sailor’(S1))?
(b) SailorName ( Bid=’103’(103))?
(c)  SName (Bid=’103’ (R1) |x| (S1))?
18- The three subparts of this question use the following E-R diagram.
Which of the following statements true?
a- Both tables should have the same number of (primary) key attributes.
bTable X should have a larger number of key attributes.
c- Table Y should have a larger number of key attributes.
d- The diagram does not suggest which table might have more attributes in its primary key.
19- In DML Language
it is NOT to
a- Create
information table on the data base.
b- Insertion of new
data into the data base.
c- deletion of information in the data base.
d- Updating information in the data base.
20- In ERD “diamond” shape represents
a- Attributes.
b- Multi valued attribute
c- Weak entity set
d- Relational set.
21- The description of the database is called the
(a) database schema
(b) database state or snapshot
(c) low level data model
(d) physical data model
Question 2: ( 10degree)
Draw ER diagram with cardinality for the following schema:
Add required fields, explain why you add them?
1. an invoice is written by one salesrep but a salesrep writes many invoices
2. a vendor sells many products but a product is bought from one vendor
3. an invoice has one or many products and a product is found on zero, one or many
invoices
4. invoice contain(inv_#,invoice date, customer Lname, customer Fname, customer street,
customer city)
5. inventory tables have(product ID, product quantity)
6. sales representative (salrepTelephone, salrepLname, salrepFname)
7. product(product ID, product name)
8. vendor( Ven_name, Ven_street, Ven_city, Ven_zip, Ven_tel)
INVOICE
PK
INV_#
INV_LINE_ITEM
PK
PK
INV_DATE
CUST_LNAME
CUST_FNAME
CUST_STREET
CUST_CITY
PROD_QUANTITY
PRODUCT
SALESREP
PK
PK
SALESREP_ID
SALESREP_LNAME
SALESREP_FNAME
SALESREP_TEL
INV_#
PROD_ID
SELLS
PROD_ID
PROD_NAME
SALESREP_ID
VEND_ID
SELLS
VENDOR
PK
VEND_ID
VEND_NAME
VEND_STREET
VEND_CITY
VEND_ZIP
VEND_TEL