CS403 Midterm Online Quiz

2 votes, 5 avg

CS403-Midterm

1 / 50

Which of the following most certainly implies the need for an entire table to implement?

A ternary relationship

A binary relationship

A recursive relationship

An identifying relationship

2 / 50

Which of the following is a correct way to implement one-to-many relationship while designing tables?

using a junction table with the keys from both the tables forming the composite primary key of the junction table.

as a single table and rarely as two tables with primary and foreign key relationships

by splitting the data into two tables with primary key and foreign key relationships

by splitting each table into three

3 / 50

Which of the following enforces a relation into 1st normal form?

Every non-key attribute is partially dependent on super key

Every non-key attribute is fully functionally dependent on primary key

The domain of attribute must include only atomic values.

non-key attribute is non-transitively dependent on primary key.

4 / 50

Which of the following concepts is applicable with respect to 2NF?

Transitive dependency

Non-transitive dependency

Any kind of dependency

Full functional dependency

5 / 50

A ____ relationship exists when an association is maintained within a single entity.

weak

binary

unary

ternary

6 / 50

Which of the following statements is NOT correct?

The functional dependency ProjNo -> DeptNo holds over R.

The functional dependency (EmpNo, ProjNo) -> DeptNo holds over R

The functional dependency EmpNo -> DeptNo holds over R.

The functional dependency DeptNo -> ProjNo holds over R.

7 / 50

Which of the following is a correct way to implement one-to-many relationship while designing tables?

by splitting each table into three

by splitting the data into two tables with primary key and foreign key relationships.

using a junction table with the keys from both the tables forming the composite primary key of the junction table.

as a single table and rarely as two tables with primary and foreign key relationships.

8 / 50

Identify the INCORRECT statement among the given

Age can be considered as a single value attribute of a person.

An entity may be an object with a physical existence like a car, a house or an Employee.

An entity type describes the schema or intension for a set of entities which share the same structure.

One cannot consider something which has conceptual existence like a course in a degree program as an entity.

9 / 50

statement among the following on the above diagram.

The diagram depicts existence dependencies.

The participation of Z in the Y relationship type is partial.

The participation of X in the Y relationship type is total.

The relationship type Y is of cardinality ratio 1 : N.

10 / 50

Which of the following constraints enforces entity integrity?

NOT NULL

CHECK

FOREIGN KEY

PRIMARY KEY

11 / 50

The ER- data model is an example of:

Logical database

Relational database

Conceptual database

Physical database

12 / 50

Which of the following is true about relational schema?

The sequence of columns is significant

The sequence of rows is significant.

Values are atomic.

Contains only derived attributes.

13 / 50

Identify the correct way to implement one-to-one relationship in tables?

using a junction table with the keys from both the tables forming the composite primary key of the junction table.

as a single table and rarely as two tables with primary and foreign key relationships.

by splitting the data into two tables with primary key and foreign key relationships.·

by creating two separate tables

14 / 50

Which of the following constraints enforces entity integrity?

PRIMARY KEY

FOREIGN KEY

NOT NULL

CHECK

15 / 50

Identify the correct statement.

When entity integrity rules are enforced, a tuple in one relation that refers to another relation must refer to an existing tuple.

Entity integrity constraints specify that primary key values can be composite.

Entity integrity constraints are specified between weak entities.

Entity integrity constraints are specified on individual relations.

16 / 50

Which of the following is true about relational schema?

The sequence of columns is significant

The sequence of rows is significant.

Values are atomic.

Contains only derived attributes.

17 / 50

Controlling redundancy in a database management system DOES NOT help to

avoid unnecessary wastage of storage space

avoid inconsistency among data

avoid duplication

avoid unauthorised access to data

18 / 50

Which of the following is not a benefit of normalization?

Minimize insertion anomolies

Minimize updation anomolies

Maximize redundancy

Minimize deletion anomolies

19 / 50

Identify the correct statement.

Entity integrity constraints are specified on individual relations.

Entity integrity constraints are specified between weak entities.

When entity integrity rules are enforced, a tuple in one relation that refers to another relation must refer to an existing tuple.

Entity integrity constraints specify that primary key values can be composite.

20 / 50

Consider the following statements.
A. An entity integrity constraint states that no primary key value can be null.
B. A referential integrity constraint is specified between two relations.
C. A foreign key cannot be used to refer to its own relation.
Identify which of the above statements is/are correct.

A and B

B and C

Only B

Only A

21 / 50

Which of the following is correct?

The FD2 violates 2NF.

The relation Interview is in BCNF.

The FD3 violates 3NF.

The relation Interview is in 3NF

22 / 50

Which of the following is true about NOT NULL constraint?

enforce domain integrity

limit the values that can be placed in a column

enforces the uniqueness of the values in a set of columns

prevents any actions that would destroy links between tables with the corresponding data values

23 / 50

Select the correct statement about the ANSI/SPARC architecture.

Any given database has many conceptual schemas and one physical schema, but it has only one external schemas.

The external level is not concerned with individual user perceptions, while the conceptual level is concerned with a community user perception.

The conceptual level is a level of indication between the internal level and the external level.

The internal level in a database system will definitely be relational.

24 / 50

The ____ constraint specifies whether each entity supertype occurrence must also be a member of at least one subtype.

inheritance

specialization

uniqueness

completeness

25 / 50

In a conceptual model for a university, what type of relationship exists between Grade and Student entities?

1:M

M:M

Ternary

1:01

26 / 50

A relation (from the relational database model) consists of a set of tuples, which implies that

all tuples in a relation must be distinct.

for any two tuples, the values associated with all ofheirt attributes may be the same.

all tuples in a particular relation may have different attributes.

relational model supports multi-valued attributes whose values can be represented in sets.

27 / 50

Which of the following is true for the relational model?

Nullvalue is a blank or zero value given to an attribute value when its value is inapplicable or its value is unknown.

Constraint is a rule that restricts the values in a database.

Complex key is a key consisting of more than one attribute.

Degree of a relation is the number of rows in a relation.

28 / 50

Which of the following functions are NOT performed by a database administrator?

Planning, designing and implementing database systems

Communicating with database users

Establishing standards and procedures for database systems

Allocation of storage locations and data structures

29 / 50

Which of the following statements is NOT correct?

The functional dependency ProjNo -> DeptNo holds over R.

The functional dependency (EmpNo, ProjNo) -> DeptNo holds over R.

The functional dependency (EmpNo, DeptNo) -> ProjNo holds over R.

The functional dependency EmpNo -> DeptNo holds over R.

30 / 50

Identify the constraint that limits the values that can be placed in a column.

NOT NULL

FOREIGN KEY

UNIQUE

CHECK

31 / 50

Who is responsible for authorizing access to the database, for coordinating and monitoring its use?

End User

Database Designer

Database Administrator

Application Programmer

32 / 50

A database system allows the following EXCEPT

any user to access all its data.

management and control of data towards an efficient working of an organisation.

more critical functions in organisations to be computerised and the need to keep a large volume of data available in an up to the minute current state increased.

integration of data across multiple applications into a single application

33 / 50

Which of the following constraints enforces entity integrity?

NOT NULL

PRIMARY KEY

FOREIGN KEY

CHECK

34 / 50

Which of the following is not true about relational tables?

Column values are of the same kind.

Each column must have a unique name.

Each row is unique.

The sequence of rows is significant.

35 / 50

As part of database naming conventions, attribute names should use suffixes such as ID, NUMBER or CODE for the _______.

primary key

foreign key

determinant

index

36 / 50

Select the correct statement among the following.

When different entity types participate only once in a single relationship type it is called a recursive relationship

Cardinality ratios for binary relationship are displayed on Entity Relationship Diagrams by using a diamond shape notation

Partial participation which is also called existence dependency is displayed as a double line connecting the participating entity type to the relationship.

Role names are not technically necessary in relationship types when all the participating entity types are distinct.

37 / 50

Identify the correct statement with respect to normalization.

The process of normalization through decomposition must achieve the lossless join property at any cost whereas the dependency reservation property is sometimes sacrificed.

Normalization can be used as a top-down standalone database design technique.

The process of normalization through decomposition must achieve the dependency reservation property at any cost whereas the lossless join property is sometimes sacrificed.

Normalization is a formal technique that can be used only at the starting phase of the database design.

38 / 50

The ____ constraint specifies whether each entity supertype occurrence must also be a member of at least one subtype.

specialization

completeness

inheritance

uniqueness

39 / 50

A collection of related data is

Logical model

Relational model

Database

Data

40 / 50

Structural constraints of a relationship type refer to

the constraints applicable in granting access to tables, columns and views in a database schema.

identifying the owner entity type relevant to a given entity type

the role that a participating entity from the entity type plays in each relationship instance.

whether the existence of an entity depends on it being related to another entity via the relationship type.

41 / 50

Consider the relation Interview (CandidateNo, InterviewDate, InterviewTime, StaffNo, RoomNo) and the following functional dependencies.
FD1 : CandidateNo, InterviewDate -> InterviewTime, StaffNo, RoomNo
FD2 : RoomNo, InterviewDate, InterviewTime -> StaffNo, CandidateNo
FD3 : StaffNo, InterviewDate -> RoomNo
Which of the following is correct?

The FD3 violates 3NF.

The relation Interview is in 3NF

The FD2 violates 2NF.

The relation Interview is in BCNF.

42 / 50

Which of the following is NOT a feature of Context DFD?

all sources/sinks (external entities)

data flows linking the process to the sources and sinks (external entities)

one process (which represents the entire system)

► sub-processes (which explain and decomposed the major process into small processes)

43 / 50

A collection of concepts that can be used to describe the structure of a database

Data model

Database

Data

DBMS

44 / 50

User rights information is stored in

Catalog

Buffer

Physical database

Logical database

45 / 50

Database management systems, operating systems, applications and utilities are all examples of ____.

computer infrastructure

hardware

input and output

software

46 / 50

A collection of concepts that can be used to describe the structure of a database

Data model

DBMS

Data

Database

47 / 50

A software package designed to store and manage databases

Data model

Database

DBMS

Data

48 / 50

Which feature of database provides conversion from inconsistent state of DB to a consistent state ensuring
minimum data loss?

Recovery service

Authorization service

User accessible catalog

Data processing

49 / 50

Identify the correct statement.

Referential integrity constraints check whether the primary key values are unique.

Referential integrity constraints check whether an attribute value lies in the given range.

Referential integrity constraints are specified between entities having recursive relationships.

When Referential integrity rules are enforced, a tuple in one relation that refers to another relation must refer to an existing tuple.

50 / 50

Consider the following statements.
A. Conceptual schema which is the result of conceptual design is a logical description of all data elements and their relationships.
B. Internal level of the database architecture consists of the physical view of the database.
C. External level of the database architecture provides the user view of the database.
With respect to the ANSI/SPARC three level database architecture, which of the above is/are correct?

Only A and B.

Only B and C.

Only C.

Only A.

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