Normal Form MCQ - General Knowledge Question and Answer

# Normal Form MCQ - Question and Answer

Normalization is a database design technique which organizes tables in a manner that reduces redundancy and dependency of data. It divides larger tables into smaller tables and links them using relationships.

#### In the __________ normal form, a composite attribute is converted to individual attributes.

First
Second
Third
Fourth

The first normal form is used to eliminate the duplicate information.

#### A table on the many side of a one to many or many to many relationship must:

Be in Second Normal Form (2NF)
Be in Third Normal Form (3NF)
Have a single attribute key
Have a composite key

The relation in second normal form is also in first normal form and no partial dependencies on any column in primary key.

#### Tables in second normal form (2NF):

Eliminate all hidden dependencies
Eliminate the possibility of a insertion anomalies
Have a composite key
Have all non key fields depend on the whole primary key

The relation in second normal form is also in first normal form and no partial dependencies on any column in primary key.

#### Which-one ofthe following statements about normal forms is FALSE?

BCNF is stricter than 3 NF
Lossless, dependency -preserving decomposition into 3 NF is always possible
Loss less, dependency – preserving decomposition into BCNF is always possible
Any relation with two attributes is BCNF

We say that the decomposition is a lossless decomposition if there is no loss of information by replacing r (R) with two relation schemas r1(R1) andr2(R2).

#### Functional Dependencies are the types of constraints that are based on______

Key
Key revisited
Superset key
None of the mentioned

Key is the basic element needed for the constraints.

#### Which is a bottom-up approach to database design that design by examining the relationship between attributes:

Functional dependency
Database modeling
Normalization
Decomposition

Normalisation is the process of removing redundancy and unwanted data.

#### Which forms simplifies and ensures that there is minimal data aggregates and repetitive groups:

1NF
2NF
3NF
All of the mentioned

The first normal form is used to eliminate the duplicate information.

#### Which forms has a relation that possesses data about an individual entity:

2NF
3NF
4NF
5NF

A Table is in 4NF if and only if, for every one of its non-trivial multivalued dependencies X \twoheadrightarrow Y, X is a superkey—that is, X is either a candidate key or a superset thereof.

#### Which forms are based on the concept of functional dependency:

1NF
2NF
3NF
4NF

The table is in 3NF if every non-prime attribute of R is non-transitively dependent (i.e. directly dependent) on every superkey of R.

#### Empdt1(empcode, name, street, city, state,pincode). For any pincode, there is only one city and state. Also, for given street, city and state, there is just one pincode. In normalization terms, empdt1 is a relation in

1 NF only
2 NF and hence also in 1 NF
3NF and hence also in 2NF and 1NF
BCNF and hence also in 3NF, 2NF and 1NF