Computer Basic Concepts and Terminology of Databases Test Online

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Question 1

1. What is the difference between DELETE and TRUNCATE in SQL?

Answer

TRUNCATE allows WHERE clause

Answer

DELETE removes records one by one, TRUNCATE removes all instantly

Answer

DELETE is faster

Answer

DELETE removes structure, TRUNCATE removes records

Question 2

2. Which of the following is a NoSQL database?

Answer

PostgreSQL

Question 3

3. What is a composite key?

Answer

A single key used across tables

Answer

A key made of multiple columns

Answer

A duplicated primary key

Answer

A foreign key

Question 4

4. Which of the following is a popular database management system (DBMS)?

Answer

Microsoft Excel

Answer

Adobe Reader

Question 5

5. What is data integrity in databases?

Answer

Encrypting the data

Answer

Sorting tables

Answer

Ensuring data remains accurate and consistent

Answer

Combining data

Question 6

6. In relational databases, a table is also called a:

Question 7

7. What is the default sort order in SQL?

Answer

Alphabetical

Answer

Descending

Question 8

8. What is a primary key?

Answer

A field used only for sorting

Answer

A duplicated field

Answer

A field that uniquely identifies a record

Answer

A field that allows null values

Question 9

9. Which constraint ensures that a column cannot have NULL values?

Question 10

10. Which of these is a relational database?

Question 11

11. Which SQL clause groups rows with the same values?

Question 12

12. What is the full form of RDBMS?

Answer

Real Data Backup and Management System

Answer

Relational Database Management System

Answer

Registered Data-Based Model Software

Answer

Random Data Management Software

Question 13

13. What does DBMS stand for?

Answer

Data Business Modeling Software

Answer

Database Managing Software

Answer

Data Backup Management System

Answer

Database Management System

Question 14

14. Which of the following defines rules for data in a table?

Answer

Constraint

Question 15

15. What is data redundancy?

Answer

Compressing data

Answer

Losing data

Answer

Repeating the same data unnecessarily

Answer

Encrypting data

Question 16

16. Which operator is used in SQL for pattern matching?

Question 17

17. What is the result of a JOIN operation?

Answer

Deletion of a record

Answer

Encrypting values

Answer

Insertion of a row

Answer

Combining rows from multiple tables based on a related column

Question 18

18. Which command is used to modify the structure of a table?

Question 19

19. Which is the correct order of SQL execution?

Answer

SELECT → WHERE → FROM

Answer

FROM → SELECT → WHERE

Answer

SELECT → FROM → WHERE

Answer

FROM → WHERE → SELECT

Question 20

20. What is a field in a database?

Answer

A group of records

Answer

A data file

Answer

A collection of tables

Answer

A single piece of data in a record

Question 21

21. What does ERD stand for?

Answer

Entry Record Document

Answer

Extended Relational Data

Answer

Entity Relationship Diagram

Answer

Entity Relational Design

Question 22

22. Which command is used to remove records from a table?

Question 23

23. What is a database index used for?

Answer

Backing up data

Answer

Encrypting data

Answer

Increasing search speed

Answer

Storing records

Question 24

24. Which of the following is not a type of DBMS?

Answer

Relational

Answer

Spreadsheet

Answer

Hierarchical

Question 25

25. Which key ensures uniqueness for each record in a table?

Answer

Primary key

Answer

Composite key

Answer

Foreign key

Answer

Secondary key

Question 26

26. Which SQL statement is used to create a new database?

Answer

MAKE DATABASE

Answer

CREATE DATABASE

Answer

NEW DATABASE

Answer

BUILD DATABASE

Question 27

27. Which one is not an SQL data type?

Question 28

28. What does the term schema refer to in databases?

Answer

A structure of tables and relationships

Answer

A report format

Answer

A backup of data

Answer

A data entry form

Question 29

29. What is a foreign key?

Answer

A duplicate of a primary key

Answer

A key used in multiple databases

Answer

A field that stores user passwords

Answer

A field that links one table to another

Question 30

30. Which clause is used with GROUP BY to filter groups?

Question 31

31. Which clause is used to filter records in SQL?

Question 32

32. Which SQL clause is used to rename a column or table?

Question 33

33. Which SQL keyword is used to sort the result set?

Question 34

34. Which SQL command is used to remove duplicate rows from results?

Question 35

35. Which SQL command is used to change existing records?

Question 36

36. Which SQL keyword is used to combine results from two queries?

Question 37

37. Which command is used to grant user permissions in SQL?

Question 38

38. Which SQL statement is used to add new records?

Question 39

39. What is a record in a database?

Answer

A column of data

Answer

A table of values

Answer

A file format

Answer

A row representing one entry

Question 40

40. Which command is used to retrieve data from a database?

Question 41

41. What does NULL represent in a database?

Answer

An empty space

Answer

A false value

Answer

A zero value

Answer

A missing or unknown value

Question 42

42. Which of the following is used to store and manage data in a structured format?

Answer

Operating system

Answer

Spreadsheet

Question 43

43. Which SQL clause is used to limit the number of records returned?

Question 44

44. What is an attribute in a database?

Answer

A set of tables

Answer

A unique row

Answer

A data field or column

Answer

A duplicate record

Question 45

45. Which SQL command is used to remove a table completely?

Question 46

46. Which function returns the number of rows in a table?

Question 47

47. What is a view in SQL?

Answer

A primary key

Answer

A physical table

Answer

A virtual table created from a SELECT query

Answer

A stored procedure

Question 48

48. What does SQL stand for?

Answer

Server Query Language

Answer

Structured Query Language

Answer

Simplified Query Language

Answer

Structured Quick Language

Question 49

49. What is the purpose of normalization?

Answer

To slow down database queries

Answer

To reduce redundancy and improve data integrity

Answer

To convert data to audio format

Answer

To duplicate data

Question 50

50. Which keyword is used to define a new table in SQL?

Answer

MAKE TABLE

Answer

BUILD TABLE

Answer

CREATE TABLE

Question 51

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Total Questions:	50
Time Allowed:	25 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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