MC	Which statement is NOT CORRECT?	In mapping an EER N:M relationship type to the relational model, we create a new relation R. Its primary key is the combination of the foreign keys referring to the primary keys of the relations corresponding to the participating entity types.	incorrect	A prime attribute type is an attribute type that is part of a candidate key. 	incorrect	A foreign key can be NULL.	incorrect	An EER relationship type always asks for the creation of a new corresponding relation R in the relational model.	correct	
MC	Given the following (normalized) relational model (primary keys underlined; foreign keys in italics):<br><br>EMPLOYEE(<u>SSN</u>, ENAME, EADDRESS, SEX, DATE_OF_BIRTH, <em>SUPERVISOR</em>, <em>DNR</em>)<br>SUPERVISOR: <em>foreign key, refers to</em> SSN in EMPLOYEE, <em>NULL value not allowed</em><br>DNR: <em>foreign key, refers to</em> DNR in DEPARTMENT, <em>NULL value not allowed</em><br><br>DEPARTMENT(<u>DNR</u>, DNAME, DLOCATION, <em>MGNR</em>)<br>MGNR: <em>foreign key, refers to</em> SSN in EMPLOYEE, <em>NULL value not allowed</em><br><br>PROJECT(<u>PNR</u>, PNAME, PDURATION, <em>DNR</em>)<br>DNR: <em>foreign key, refers to</em> DNR in DEPARTMENT, <em>NULL value not allowed</em><br><br>WORKS_ON(<u><em>SSN, PNR,</em></u> HOURS)<br>SSN: <em>foreign key, refers to</em> SSN in EMPLOYEE, <em>NULL value not allowed</em><br>PNR: <em>foreign key, refers to</em> PNR in PROJECT, <em>NULL value not allowed</em><br><br>Which statement is NOT CORRECT?	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	Every project is always assigned to exactly one department.	incorrect	A department has always exactly one manager.	incorrect	
MC	Given the following (normalized) relational model (primary keys underlined; foreign keys in italics):<br><br>EMPLOYEE(<u>SSN</u>, ENAME, EADDRESS, SEX, DATE_OF_BIRTH, <em>SUPERVISOR</em>, <em>DNR</em>)<br>SUPERVISOR: <em>foreign key, refers to</em> SSN in EMPLOYEE, <em>NULL value not allowed</em><br>DNR: <em>foreign key, refers to</em> DNR in DEPARTMENT, <em>NULL value not allowed</em><br><br>DEPARTMENT(<u>DNR</u>, DNAME, DLOCATION, <em>MGNR</em>)<br>MGNR: <em>foreign key, refers to</em> SSN in EMPLOYEE, <em>NULL value not allowed</em><br><br>PROJECT(<u>PNR</u>, PNAME, PDURATION, <em>DNR</em>)<br>DNR: <em>foreign key, refers to</em> DNR in DEPARTMENT, <em>NULL value not allowed</em><br><br>WORKS_ON(<u><em>SSN, PNR,</em></u> HOURS)<br>SSN: <em>foreign key, refers to</em> SSN in EMPLOYEE, <em>NULL value not allowed</em><br>PNR: <em>foreign key, refers to</em> PNR in PROJECT, <em>NULL value not allowed</em><br><br>Which statement is NOT CORRECT?	A department has always exactly one manager.	incorrect	An employee must work in the same department than he/she manages.	correct	Every project is always assigned to exactly one department.	incorrect	Every employee must be always supervised by exactly one other employee.	incorrect	
MC	A relation is in 3 NF if it satisfies 2 NF and...	no 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 non-primary key of R is transitively dependent on a prime attribute type.	incorrect	no nonprime attribute type of R is transitively dependent on the primary key.	correct	
MC	Given the following relational model (primary keys are underlined, foreign keys are in italics)<br><br>BOOK(<u>ISBN</u>, title, pages, price, <em>publishername</em>)<br>AUTHOR(<u>authorname</u>, date_of_birth)<br>WRITES(<u><em>authorname</em></u>, <u><em>ISBN</em></u>)<br>PUBLISHER(<u>publishername</u>, streetnumber, streetname, <em>zipcode</em>)<br>CITY(<u>zipcode</u>, city)<br><br>The assumptions are: <ul><li>Each book has a unique ISBN number</li><li>Each author has a unique name</li><li>Each publisher has a unique name</li><li>A book can have multiple authors</li><li>An auther can write more than one book</li><li>A publisher can publish more than one book</li><li>A book can have multiple publishers</li><li>A publisher has only one address</li></ul>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 second normal form but not in third normal form.	incorrect	The relational model is in third normal form.	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 countries.	correct	Unnecessary replication of data about athletes and countries.	incorrect	No unnecessary replication of data.	incorrect	Unnecessary replication of data about athletes.	incorrect	
MC	Given the following relational model (primary keys are underlined, foreign keys are in italics)<br><br>BOOK(<u>ISBN</u>, title, pages, price, <em>publishername</em>)<br>AUTHOR(<u>authorname</u>, date_of_birth)<br>WRITES(<u><em>authorname</em></u>, <u><em>ISBN</em></u>)<br>PUBLISHER(<u>publishername</u>, streetnumber, streetname, <em>zipcode</em>)<br>CITY(<u>zipcode</u>, city)<br><br>The assumptions are: <ul><li>Each book has a unique ISBN number</li><li>Each author has a unique name</li><li>Each publisher has a unique name</li><li>A book can have multiple authors</li><li>An auther can write more than one book</li><li>A publisher can publish more than one book</li><li>A book can have multiple publishers</li><li>A publisher has only one address</li></ul>Which statement is CORRECT?	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	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	Consider the following ER model for a course administration.<br><br><img class="img-fluid" src="http://www.pdbmbook.com/static/quiz/fig6_12.png"><br><br>Which statement is NOT CORRECT?	When mapping the ER relationship type enrollment between Session and Student to the relational model, a new relation needs to be introduced. The 4 cardinalities of this ER relationship type can be perfectly mapped to the relational model.	incorrect	When mapping the ER relationship type teaches between Session and Teacher to the relational model, a new relation needs to be introduced. The 4 cardinalities of this ER relationship type can be perfectly mapped to the relational model.	correct	Both the ER and the relational model cannot enforce that a teacher can only teach sessions of courses for which he/she is qualified.	incorrect	When mapping the ER relationship type organizes between Course and Session to the relational model, the primary key "cnb" of the Course relation will be included as a NOT NULL foreign key in the Session relation. The 4 cardinalities of this ER relationship type can be perfectly mapped to the relational model.	incorrect	
MC	Consider the following ER model for a course administration.<br><br><img class="img-fluid" src="http://www.pdbmbook.com/static/quiz/fig6_12.png"><br><br>Which statement is NOT CORRECT?	When mapping the ER relationship type teaches between Session and Teacher to the relational model, a new relation needs to be introduced. The 4 cardinalities of this ER relationship type can be perfectly mapped to the relational model.	correct	When mapping the ER relationship type organizes between Course and Session to the relational model, the primary key "cnb" of the Course relation will be included as a NOT NULL foreign key in the Session relation. The 4 cardinalities of this ER relationship type can be perfectly mapped to the relational model.	incorrect	When mapping the ER relationship type enrollment between Session and Student to the relational model, a new relation needs to be introduced. The 4 cardinalities of this ER relationship type can be perfectly mapped to the relational model.	incorrect	Both the ER and the relational model cannot enforce that a teacher can only teach sessions of courses for which he/she is qualified.	incorrect	
MC	Consider the following EER model <br><br><img class="img-fluid" src="http://www.pdbmbook.com/static/quiz/fig6_10.png"><br><br>Which statement is 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 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	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 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