MC Given the following (normalized) relational model (primary keys are underlined, foreign keys are in italics).

EMPLOYEE(SSN, ENAME, EADDRESS, SEX, DATE_OF_BIRTH, SUPERVISOR, DNR)
SUPERVISOR: foreign key, refers to SSN in EMPLOYEE, NULL value allowed
DNR: foreign key, refers to DNR in DEPARTMENT, NULL value not allowed

DEPARTMENT(DNR, DNAME, DLOCATION, MGNR)
MGNR: foreign key, refers to SSN in EMPLOYEE, NULL value not allowed

PROJECT(PNR, PNAME, PDURATION, DNR)
DNR: foreign key, refers to DNR in DEPARTMENT, NULL value not allowed)

WORKS_ON(SSN, PNR,, HOURS)
SSN: foreign key, refers to SSN in EMPLOYEE, NULL value not allowed
PNR: foreign key, refers to PNR in PROJECT, NULL value not allowed

Which statement is CORRECT? According to the model, an employee can manage multiple departments. correct According to the model, a supervisor cannot supervise more than one employee. incorrect According to the model, an employee should always work on projects assigned to his/her department. incorrect According to the model, an employee can work in multiple departments. incorrect MC Given the following relational model (primary keys are underlined, foreign keys in italics):

STUDENT(studentnumber, studentname, street name, street number, zip code, city)
ENROLLED(student_number, course_number)
COURSE(course number, course name)
PROFESSOR(professor number, professor name)
TEACHES(course number, professor number)

Which statement is CORRECT? The model can be further normalized. correct The model does not allow a course to be followed by multiple students. incorrect The model does not allow a professor to teach multiple courses. incorrect The model does not allow a course to be taught by multiple professors. incorrect MC Consider a data model for the Olympics storing information about countries and athletes. There is a 1-N relationship type between country and athlete and an athlete always has to belong to exactly 1 country. A relational data model containing only 1 table leads to: Unnecessary replication of data about athletes. incorrect Unnecessary replication of data about countries. correct No unnecessary replication of data. incorrect Unnecessary replication of data about athletes and countries. incorrect MC Given the following (normalized) relational model (primary keys underlined; foreign keys in italics):

EMPLOYEE(SSN, ENAME, EADDRESS, SEX, DATE_OF_BIRTH, SUPERVISOR, DNR)
SUPERVISOR: foreign key, refers to SSN in EMPLOYEE, NULL value not allowed
DNR: foreign key, refers to DNR in DEPARTMENT, NULL value not allowed

DEPARTMENT(DNR, DNAME, DLOCATION, MGNR)
MGNR: foreign key, refers to SSN in EMPLOYEE, NULL value not allowed

PROJECT(PNR, PNAME, PDURATION, DNR)
DNR: foreign key, refers to DNR in DEPARTMENT, NULL value not allowed

WORKS_ON(SSN, PNR, HOURS)
SSN: foreign key, refers to SSN in EMPLOYEE, NULL value not allowed
PNR: foreign key, refers to PNR in PROJECT, NULL value not allowed

Which statement is NOT CORRECT? A department has always exactly one manager. incorrect Every project is always assigned to exactly one department. incorrect An employee must work in the same department than he/she manages. correct Every employee must be always supervised by exactly one other employee. incorrect MC Given the following relational model (primary keys are underlined, foreign keys are in italics)

BOOK(ISBN, title, pages, price, publishername)
AUTHOR(authorname, date_of_birth)
WRITES(authorname, ISBN)
PUBLISHER(publishername, streetnumber, streetname, zipcode)
CITY(zipcode, city)

The assumptions are: Which statement is CORRECT? The relational model is in second normal form but not in third normal form. incorrect The relational model is in third normal form. incorrect The relational model is in first normal form but not in second normal form. incorrect The relational model is not in first normal form. correct MC Given the following (normalized) relational model (primary keys underlined; foreign keys in italics):

EMPLOYEE(SSN, ENAME, EADDRESS, SEX, DATE_OF_BIRTH, SUPERVISOR, DNR)
SUPERVISOR: foreign key, refers to SSN in EMPLOYEE, NULL value not allowed
DNR: foreign key, refers to DNR in DEPARTMENT, NULL value not allowed

DEPARTMENT(DNR, DNAME, DLOCATION, MGNR)
MGNR: foreign key, refers to SSN in EMPLOYEE, NULL value not allowed

PROJECT(PNR, PNAME, PDURATION, DNR)
DNR: foreign key, refers to DNR in DEPARTMENT, NULL value not allowed

WORKS_ON(SSN, PNR, HOURS)
SSN: foreign key, refers to SSN in EMPLOYEE, NULL value not allowed
PNR: foreign key, refers to PNR in PROJECT, NULL value not allowed

Which statement is NOT CORRECT? Every project is always assigned to exactly one department. incorrect Every employee must be always supervised by exactly one other employee. incorrect A department has always exactly one manager. incorrect An employee must work in the same department than he/she manages. correct MC Given the following relational model (primary keys are underlined, foreign keys are in italics)

BOOK(ISBN, title, pages, price, publishername)
AUTHOR(authorname, date_of_birth)
WRITES(authorname, ISBN)
PUBLISHER(publishername, streetnumber, streetname, zipcode)
CITY(zipcode, city)

The assumptions are: Which statement is CORRECT? The relational model is not in first normal form. correct The relational model is in first normal form but not in second normal form. incorrect The relational model is in third normal form. incorrect The relational model is in second normal form but not in third normal form. incorrect MC Given the following (normalized) relational model (primary keys are underlined, foreign keys are in italics).

EMPLOYEE(SSN, ENAME, EADDRESS, SEX, DATE_OF_BIRTH, SUPERVISOR, DNR)
SUPERVISOR: foreign key, refers to SSN in EMPLOYEE, NULL value allowed
DNR: foreign key, refers to DNR in DEPARTMENT, NULL value not allowed

DEPARTMENT(DNR, DNAME, DLOCATION, MGNR)
MGNR: foreign key, refers to SSN in EMPLOYEE, NULL value not allowed

PROJECT(PNR, PNAME, PDURATION, DNR)
DNR: foreign key, refers to DNR in DEPARTMENT, NULL value not allowed)

WORKS_ON(SSN, PNR,, HOURS)
SSN: foreign key, refers to SSN in EMPLOYEE, NULL value not allowed
PNR: foreign key, refers to PNR in PROJECT, NULL value not allowed

Which statement is CORRECT? According to the model, a supervisor cannot supervise more than one employee. incorrect According to the model, an employee can manage multiple departments. correct According to the model, an employee can work in multiple departments. incorrect According to the model, an employee should always work on projects assigned to his/her department. incorrect MC Consider the following EER model



Which statement is CORRECT? The partial inheritance relationship between STUDENT and REPRESENTATIVE can be perfectly mapped to the relational model by the following two relations: STUDENT(StudentID, FirstName, LastName) and REPRESENTATIVE (S-StudentID, Email) whereby S-StudentID refers to StudentID in STUDENT. correct When mapping the EER relationship type INVOLVE between COURSE and ASSIGNMENT to the relational model, a new relation needs to be introduced. The 1..1 cardinalities of this relationship type cannot be enforced in the relational model. incorrect When mapping the EER relationship type IS_ENROLLED between COURSE and STUDENT to the relational model, a new relation needs to be introduced. The relation is identified by GRADE as its primary key. incorrect When mapping the EER relationship type PARTICIPATE between GROUP ASSIGNMENT and STUDENT to the relational model, a new relation needs to be introduced. The 4 cardinalities of this EER relationship type can be perfectly mapped to the relational model. incorrect MC A relation is in 3 NF if it satisfies 2 NF and... no nonprime attribute type of R is transitively dependent on the primary key. correct no non-primary key of R is transitively dependent on a prime attribute type. incorrect no prime attribute type of R is transitively dependent on the primary key. incorrect no primary key of R is transitively dependent on a prime attribute type. incorrect