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40 interview questions on Databasefor developers (2026)

Test your technical skills before an interview of Database with 40 corrected questions. Beginner, Intermediate or Expert level.

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40 questions
Expert
9 votes986 runs1 comment

How to obtain the surname and first name of people running more than 10 units?

Data Scientist
database
projection
selection
Anonymous authorat Mar 28, 2022
Medium
5 votes825 runs1 comment

Which entity provides the legal framework supervising databases in France?

Data Scientist
database
france
Anonymous authorat Sep 19, 2022
Expert
4 votes894 runs
1 comment

Find the keys of the following functional dependencies: a, b -> c a, b, d -> e c -> a, b d -> f e -> g

Data Scientist
database
functional dependencies
Anonymous authorat Mar 28, 2022
Expert
4 votes831 runs
1 comment

What is GDPR?

Data Scientist
data
regulation
Anonymous authorat Sep 19, 2022
Easy
4 votes727 runs0 comment

What type of constraint was violated?

Data Scientist
database
primary key
uniqueness
Anonymous authorat Sep 19, 2022
Medium
3 votes763 runs0 comment

The decomposition normalization algorithm is?.

Data Scientist
database
normalization
Anonymous authorat Sep 19, 2022
Expert
2 votes694 runs0 comment

What happens when you make the same transaction several times?

Data Scientist
database
transactions
Anonymous authorat Sep 19, 2022
Easy
1 vote713 runs0 comment

What is a database?

Data Scientist
data
storage
Anonymous authorat Sep 19, 2022
Expert
1 vote681 runs0 comment

Properties of an elementary functional dependency X$ ightarrow$Y

Data Scientist
database
functional dependency
Anonymous authorat Sep 19, 2022
Medium
1 vote666 runs0 comment

What is the problem with a Cartesian product of tables?

Data Scientist
database
joins
Anonymous authorat Mar 28, 2022
Hard
1 vote213 runs0 comment

Find the minimum number of functional dependencies to be removed in order to achieve a non redundant coverage.

Data Scientist
database
functional dependencies
Anonymous authorat Mar 28, 2022
Medium
1 vote87 runs1 comment

What type of constraint was violated?

Data Scientist
database
constraint
Anonymous authorat Mar 17, 2023
Hard
1 vote45 runs0 comment

Normalization by synthesis algorithm is?.

Data Scientist
database
normalization
Anonymous authorat Mar 28, 2022
Hard
0 vote708 runs0 comment

Which of these propositions can be types of constraints in a database?

Data Scientist
database
constraints
Anonymous authorat Sep 19, 2022
Expert
0 vote697 runs0 comment

Get all the names from the table E={(Name), (first name), time}.

Data Scientist
database
projection
Anonymous authorat Sep 19, 2022
Medium
0 vote670 runs0 comment

What is a Table in a database?

Data Scientist
database
table
Anonymous authorat Sep 19, 2022
Expert
0 vote665 runs0 comment

Find the normal form of the relation {a -> b; c -> a, d, e; f -> a}.

Data Scientist
database
normal form
Anonymous authorat Mar 28, 2022
Medium
0 vote665 runs0 comment

What does the bond 0..* mean in a database?

Data Scientist
database
cardinality
Anonymous authorat Mar 28, 2022
Easy
0 vote662 runs0 comment

How is a database managed with?

Data Scientist
database
management
Anonymous authorat Mar 28, 2022
Easy
0 vote662 runs0 comment

A relation must contain at least one key

Data Scientist
database
relation
Anonymous authorat Mar 28, 2022