EMPLOYEE(

SUPERVISOR:

DNR:

DEPARTMENT(

MGNR:

PROJECT(

DNR:

WORKS_ON(

SSN:

PNR:

Which statement is NOT 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 Which statement is CORRECT? A foreign key of a relation A cannot refer to the primary key of the same relation A. incorrect A relation cannot have more than 1 foreign key. incorrect Every relation must have a foreign key. incorrect A foreign key can be NULL. correct 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 Unnecessary replication of data about athletes and countries. incorrect No unnecessary replication of data. incorrect MC The following relational model represents a HRM system of a consultancy firm. The primary keys are underlined while foreign keys are in italic font.

Consultant (

Assigned_to (

Project (

Company (

Suppose a new consultant is hired and immediately assigned to a new training project at a new firm and to 2 other, already existing projects. How many rows (tuples) must be added to the database to reflect this change? 1 incorrect 3 incorrect 5 incorrect 6 correct MC Given the following (normalized) relational model (primary keys underlined; foreign keys in italics):

EMPLOYEE(

SUPERVISOR:

DNR:

DEPARTMENT(

MGNR:

PROJECT(

DNR:

WORKS_ON(

SSN:

PNR:

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

STUDENT(

ENROLLED(

COURSE(

PROFESSOR(

TEACHES(

Which statement is CORRECT? The model does not allow a course to be taught by multiple professors. incorrect The model can be further normalized. correct The model does not allow a professor to teach multiple courses. incorrect The model does not allow a course to be followed by multiple students. 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 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 no non-primary key of R is transitively dependent on a prime attribute type. incorrect MC Which statement is CORRECT? The Boyce Codd normal form is more strict than the fourth normal form. incorrect The Boyce Codd normal form is more strict than the third normal form. correct The second normal form is more strict than the Boyce Codd normal form incorrect The first normal form is more strict than the Boyce Codd normal form. incorrect MC Consider following generalization / specialization.

Suppose we represent this generalization / specialization by the following relational model:

Discipline (

Individual sport (

Teamsport (

Consider the following 4 statements:

1) The relational model does not allow to enforce the completeness constraint; the disjointness constraint can be enforced.

2) The relational model does not allow to enforce both the completeness constraint and the disjointness constraint.

3) By dropping the relation 'Discipline' in the relational model, the completeness constraint can be enforced.

4) The relational model allows the specialization to be partial.

Which of the following options is CORRECT? Statement 1 and 2 are both correct. incorrect Statement 1 and 4 are both incorrect. incorrect Only statement 1 is incorrect, the other statements are correct. correct Only statement 4 is incorrect, the other statements are correct. incorrect MC Consider the following EER model

Which statement is 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 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 MC Given the following relational model (primary keys are underlined, foreign keys are in italics)

BOOK(

AUTHOR(

WRITES(

PUBLISHER(

CITY(

The assumptions are:

- Each book has a unique ISBN number
- Each author has a unique name
- Each publisher has a unique name
- A book can have multiple authors
- An auther can write more than one book
- A publisher can publish more than one book
- A book can have multiple publishers
- A publisher has only one address

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

In mapping this EER specialization to a relational model, which statement is CORRECT? We can never enforce a total specialization in the relational model. incorrect We can never enforce a disjoint specialization in the relational model. incorrect Creating three relations Customers(customerID, name), Private(

Which statement is NOT CORRECT when mapping the above EER model to a relational model? A new relation should be created to model the EER relationship type between customer and commercial flight. incorrect A new relation should be created to model the EER relationship type between flight and airline. correct The total EER specialization can be mapped to the relational model without loss of semantics. incorrect The Airline's primary key should be included as a NOT NULL foreign key in the relation 'Flight'. incorrect MC

Consider this EER model.

Which statement is CORRECT? All 4 cardinalities can be perfectly mapped to the relational model. incorrect Both minimum cardinalities cannot be successfully mapped to the relational model. correct Both maximum cardinalities cannot be successfully mapped to the relational model. incorrect The relational model cannot enforce that an employee can be supervised by M other employees. incorrect MC

Which statement is NOT CORRECT when mapping the above EER model to a relational model? The minimum cardinality of 1 at the 'Table' side of the EER relationship type between 'Table' and 'Reservation can be successfully mapped to the relational model. correct To map the weak entity type 'Table' to a relation, we should add the foreign key 'restaurant name' to the corresponding relation and ensure that is not NULL. incorrect We should create a new relation to model the EER relationship type between 'Table' and 'Reservation'. incorrect The minimum cardinality of 1 at the side of 'Restaurant' in the EER relationship type between 'Restaurant' and 'Table' can be successfully mapped to the relational model. incorrect MC

In order to turn this EER model into a fully normalised relational model, how many relations do we need? 5 incorrect 6 correct 7 incorrect 8 incorrect MC

Which of the following statements on mapping the above EER model to a relational model is correct? We cannot enforce all four cardinalities of the EER relationship type between 'Park' and 'Activity area'. incorrect We cannot enforce all four cardinalities of the EER relationship type between 'Bungalow' and 'Reservation'. correct The minimum cardinality of 1 at the side of 'Customers' in the EER relationship type between 'Customers' and 'Ticket' cannot be enforced. incorrect We cannot enforce that the EER specialization is total in the relational model. incorrect MC Consider the following EER categorisation

Suppose we map this to the relational model as follows:

PERSON (

COMPANY (

ACCOUNT-HOLDER (CustNo, ...)

Which statement is correct? The categorisation can be perfectly mapped to the relational model. incorrect The foreign keys P-CustNo and C-CustNo should be defined as NOT NULL. incorrect We cannot guarantee that the tuples of the category relation are a subset of the union of the tuples of the superclasses. correct The categorisation can also be modelled as a specialisation. incorrect MC Consider the following EER model

Which statement is correct? All 4 cardinalities can be perfectly mapped to the relational model. incorrect The relational model cannot enforce that an employee supervises at least one other employee. correct The relational model cannot enforce that an employee can be supervised by at most one other employee. incorrect The relational model cannot enforce that an employee can supervise N other employees. incorrect MC Consider the following EER ternary relationship type

Which statement is correct? The minimum cardinality of 1 cannot be successfully mapped to the relational model. correct All 6 cardinalities can be perfectly mapped to the relational model. incorrect All maximum cardinalities of N cannot be successfully mapped to the relational model. incorrect The corresponding relational model has 3 relations. incorrect MC Given the following relation:

HospitalRoom (

Which statement is not correct? '(hospitalID, roomNR)' is a minimal superkey. incorrect Every non-prime attribute of this relation is fully functionally dependent on any key of this relation. correct 'roomNR' is a prime attribute type. incorrect 'city' is transitive dependent on the primary key. incorrect MC Given the following relation:

Wine (

Which statement is correct? The relation is not in 1NF. correct The relation is in 1NF but not in 2NF. incorrect The relations is in 2NF but not in 3NF. incorrect The relation is in 3NF but not in BCNF. incorrect MC Given the following relations:

Artist (

Tour (

'artistID' is a foreign key referring to 'ID' in 'Artist'. This value cannot be NULL.

Show (

'tour name' is a foreign key referring to 'name' in 'Tour'. This value cannot be NULL.

Customer (

Ticket (

'customerID' is a foreign key referring to 'ID' in 'Customer'. This value cannot be NULL.

'venue' is a foreign key referring to 'venue' in 'Show'. This value cannot be NULL.

'tour name' is a foreign key referring to 'name' in 'Tour'. This value cannot be NULL.

Which statement is correct? An artist can only have one tour. incorrect All these relations are in 2NF, but not in 3NF. incorrect A customer can only buy one ticket for a certain show. correct The relations can be further normalised. incorrect MC Given the following relations:

Book (

Library is a foreign key referring to 'zip code' in 'Library'. This value can be NULL.

Library (

Customer (

Loan (

ISBN is a foreign key referring to 'ISBN' in 'Book' and cannot be NULL.

customerID is a foreign key referring to 'ID' in 'Customer' and cannot be NULL.

Which statement is not correct? A book can be loaned by different customers. incorrect All the relations are in 2NF but not in 3NF. correct A library can be uniquely identified based on its zip code. incorrect A customer can loan multiple books. incorrect MC Given the following relations:

Cinema(

Show(

'cinema name' is a foreign key referring to 'name' in 'Cinema'. This value cannot be NULL.

Which statement is CORRECT? This relation is in 2NF, but not in 3NF. incorrect A cinema can show multiple movies. correct A movie can only be shown in one cinema. incorrect This relation is in 3NF, but not in BCNF. incorrect MC Given this relation in 1NF:

Reservation(customerID, roomID, customer name, room name, date, time)

Which of the following statement is correct? The same room can be booked by the same customer on different dates and/or time. incorrect A customer must have a unique name. incorrect A customer can book multiple rooms at the same date and time. correct This relation is also in 2NF. incorrect MC How many relations would have to be created to fully normalize the following relation (including the relation 'Store')?

Store(ID, address(street, number, zipcode, city)

Employee(SSN, name, date of birth)

Manager(SSN, name, date of birth)

Product(ID, name, price))

Assume that a store can have multiple employees but an employee works at only one store. A store has exactly one manager and a manager can only manage one store. A store can have multiple products, and a product can be sold in different stores. A store's ID, an employee's SSN and a product's ID are unique. 4 incorrect 5 incorrect 6 correct 7 incorrect MC Which statement is CORRECT? A superkey is a key that cannot have any of its attribute types removed. This is also called a minimal key. incorrect The referential integrity constraint poses that a primary key should never have a NULL value. incorrect A prime attribute type is an attribute type that is part of a candidate key. correct The Boyce-Codd normal form is more strict than the fourth normal form. incorrect MC Which statement is CORRECT? A relation is in 2NF if it is in 1NF and every prime attribute type A in R is fully functionally dependent on any key of R. incorrect A relation is in 4NF if it is in 3NF and no non-prime attribute type of R is transitively dependent on the primary key. incorrect A relation is in 3NF if it is in BCNF and no prime attribute type of R is transitively dependent on the primary key. incorrect A relation is in 3NF if it is in 2NF and no non-prime attribute type of R is transitively dependent on the primary key. correct MC Which statement is CORRECT? An EER relationship type always asks for the creation of a new corresponding relation R in the relational model. incorrect A minimum cardinality of 1 in the EER model can never be enforced in the relational model. incorrect 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. correct An EER aggregation cannot be mapped in a straightforward way to a relational model. incorrect