Mastering Database Concepts

Mastering Database Concepts

University

10 Qs

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Mastering Database Concepts

Mastering Database Concepts

Assessment

Quiz

Other

University

Practice Problem

Hard

Created by

youssef hamdy

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a primary key in a database?

A primary key is a type of foreign key in a database.

A primary key is used to store large amounts of data in a database.

A primary key can have duplicate values in a database.

A primary key is a unique identifier for a record in a database.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Explain the difference between SQL and NoSQL databases.

SQL databases are relational with a fixed schema; NoSQL databases are non-relational with flexible schemas.

SQL databases are designed for unstructured data.

NoSQL databases require a predefined schema.

SQL databases are non-relational with a fixed schema.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is normalization in database design?

A method to increase data redundancy

A way to merge multiple databases into one

Normalization in database design is the process of organizing data to minimize redundancy and dependency.

A technique for data encryption

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Define a foreign key and its purpose.

A foreign key is a field that links two tables by referencing the primary key of another table, ensuring data integrity.

A foreign key is a field that stores data without any relationship to other tables.

A foreign key is a type of primary key used in the same table.

A foreign key is a unique identifier for a single table.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a database index and why is it used?

A database index is a data structure that improves the speed of data retrieval operations.

A database index is a method for encrypting data.

A database index is a type of database backup.

A database index is used to store data permanently.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the ACID properties in database transactions?

Atomicity, Clarity, Isolation, Reliability

Atomicity, Consistency, Isolation, Accessibility

Accuracy, Clarity, Integrity, Timeliness

ACID properties: Atomicity, Consistency, Isolation, Durability.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Explain the concept of a join in SQL.

A join in SQL combines rows from two or more tables based on a related column.

A join in SQL is a method to sort data within a single table.

A join in SQL is used to create new tables from existing ones.

A join in SQL deletes rows from one table based on another.

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