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Question 1

What is a primary key?

Options :

A :

An attribute that can have multiple values

B :

A reserved word in SQL

C :

A unique identifier for a data entity

D :

A foreign key in a related table

Answer: C

Question 2

Which SQL keyword is used to delete data from a table?

Options :

A :

REMOVE

B :

DROP

C :

DELETE

D :

ERASE

Answer: C

Question 3

What is a primary key in a database?

Options :

A :

A unique identifier for a specific record in a table

B :

A way to encrypt sensitive data in a database

C :

A data type used to store numerical values

D :

A secondary index used for optimizing query performance

Answer: A

Question 4

Which of the following data modeling techniques allows for the creation of relationships between entities?

Options :

A :

Document modeling

B :

Hierarchical modeling

C :

Entity-Attribute-Value (EAV) modeling

D :

Relational modeling

Answer: D

Question 5

Which keyword is used to filter results based on a specific condition in a SELECT statement?

Options :

A :

ORDER BY

B :

HAVING

C :

GROUP BY

D :

WHERE

Answer: D