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Himachal Pradesh Computer - Practice Mock Test Set 53

1. If you run SELECT COUNT(salary) FROM employees and some salary values are NULL, what does the query return?

Computer 📄 JOA IT (2026)

A. It returns the total number of rows including those with NULL B. It returns zero if any value is NULL C. It produces an error because of NULL values D. It returns the count of rows with non-NULL salary values

2. If you run SELECT COUNT(salary) FROM employees and some salary values are NULL, what does the query return?

Computer 📄 JOA IT (2026)

A. It returns the total number of rows including those with NULL B. It returns zero if any value is NULL C. It produces an error because of NULL values D. It returns the count of rows with non-NULL salary values

3. If you run SELECT COUNT(salary) FROM employees and some salary values are NULL, what does the query return?

Computer 📄 JOA IT (2026)

A. It returns the total number of rows including those with NULL B. It returns zero if any value is NULL C. It produces an error because of NULL values D. It returns the count of rows with non-NULL salary values

4. If you run SELECT COUNT(salary) FROM employees and some salary values are NULL, what does the query return?

Computer 📄 JOA IT (2026)

A. It returns the total number of rows including those with NULL B. It returns zero if any value is NULL C. It produces an error because of NULL values D. It returns the count of rows with non-NULL salary values

5. If you run SELECT COUNT(salary) FROM employees and some salary values are NULL, what does the query return?

Computer 📄 JOA IT (2026)

A. It returns the total number of rows including those with NULL B. It returns zero if any value is NULL C. It produces an error because of NULL values D. It returns the count of rows with non-NULL salary values

6. If you run SELECT COUNT(salary) FROM employees and some salary values are NULL, what does the query return?

Computer 📄 JOA IT (2026)

A. It returns the total number of rows including those with NULL B. It returns zero if any value is NULL C. It produces an error because of NULL values D. It returns the count of rows with non-NULL salary values

7. A database administrator is working in MySQL and needs to view all available databases present on the server. Understanding the correct command is essential for managing database environments. Which SQL statement correctly displays all databases in MySQL?

Computer 📄 JOA IT (2026)

A. LIST DATABASES; B. DISPLAY DATABASES; C. SHOW DATABASES; D. VIEW ALL DATABASES;

8. A database administrator is working in MySQL and needs to view all available databases present on the server. Understanding the correct command is essential for managing database environments. Which SQL statement correctly displays all databases in MySQL?

Computer 📄 JOA IT (2026)

A. LIST DATABASES; B. DISPLAY DATABASES; C. SHOW DATABASES; D. VIEW ALL DATABASES;

9. A database administrator is working in MySQL and needs to view all available databases present on the server. Understanding the correct command is essential for managing database environments. Which SQL statement correctly displays all databases in MySQL?

Computer 📄 JOA IT (2026)

A. LIST DATABASES; B. DISPLAY DATABASES; C. SHOW DATABASES; D. VIEW ALL DATABASES;

10. A database administrator is working in MySQL and needs to view all available databases present on the server. Understanding the correct command is essential for managing database environments. Which SQL statement correctly displays all databases in MySQL?

Computer 📄 JOA IT (2026)

A. LIST DATABASES; B. DISPLAY DATABASES; C. SHOW DATABASES; D. VIEW ALL DATABASES;

11. A database administrator is working in MySQL and needs to view all available databases present on the server. Understanding the correct command is essential for managing database environments. Which SQL statement correctly displays all databases in MySQL?

Computer 📄 JOA IT (2026)

A. LIST DATABASES; B. DISPLAY DATABASES; C. SHOW DATABASES; D. VIEW ALL DATABASES;

12. A database administrator is working in MySQL and needs to view all available databases present on the server. Understanding the correct command is essential for managing database environments. Which SQL statement correctly displays all databases in MySQL?

Computer 📄 JOA IT (2026)

A. LIST DATABASES; B. DISPLAY DATABASES; C. SHOW DATABASES; D. VIEW ALL DATABASES;

13. A database administrator is working in MySQL and needs to view all available databases present on the server. Understanding the correct command is essential for managing database environments. Which SQL statement correctly displays all databases in MySQL?

Computer 📄 JOA IT (2026)

A. LIST DATABASES; B. DISPLAY DATABASES; C. SHOW DATABASES; D. VIEW ALL DATABASES;

14. A database administrator is working in MySQL and needs to view all available databases present on the server. Understanding the correct command is essential for managing database environments. Which SQL statement correctly displays all databases in MySQL?

Computer 📄 JOA IT (2026)

A. LIST DATABASES; B. DISPLAY DATABASES; C. SHOW DATABASES; D. VIEW ALL DATABASES;

15. Which SQL command is used to permanently delete a database in MySQL?

Computer 📄 JOA IT (2026)

A. DROP DATABASE B. REMOVE DATABASE C. ERASE DATABASE D. DELETE DATABASE

16. Which SQL command is used to permanently delete a database in MySQL?

Computer 📄 JOA IT (2026)

A. DROP DATABASE B. REMOVE DATABASE C. ERASE DATABASE D. DELETE DATABASE

17. Which SQL command is used to permanently delete a database in MySQL?

Computer 📄 JOA IT (2026)

A. DROP DATABASE B. REMOVE DATABASE C. ERASE DATABASE D. DELETE DATABASE

18. Which SQL command is used to permanently delete a database in MySQL?

Computer 📄 JOA IT (2026)

A. DROP DATABASE B. REMOVE DATABASE C. ERASE DATABASE D. DELETE DATABASE

19. Which SQL command is used to permanently delete a database in MySQL?

Computer 📄 JOA IT (2026)

A. DROP DATABASE B. REMOVE DATABASE C. ERASE DATABASE D. DELETE DATABASE

20. Which SQL command is used to permanently delete a database in MySQL?

Computer 📄 JOA IT (2026)

A. DROP DATABASE B. REMOVE DATABASE C. ERASE DATABASE D. DELETE DATABASE

21. Which SQL command is used to permanently delete a database in MySQL?

Computer 📄 JOA IT (2026)

A. DROP DATABASE B. REMOVE DATABASE C. ERASE DATABASE D. DELETE DATABASE

22. Which SQL command is used to permanently delete a database in MySQL?

Computer 📄 JOA IT (2026)

A. DROP DATABASE B. REMOVE DATABASE C. ERASE DATABASE D. DELETE DATABASE

23. In which situation would the DBMS disadvantage of system failure have the most severe consequences for an organization?

Computer 📄 JOA IT (2026)

A. When daily backups are scheduled and maintained B. When daily operations rely on DBMS without adequate backups C. When partial data is stored outside DBMS D. When DBMS is only used for non-essential reports

24. In which situation would the DBMS disadvantage of system failure have the most severe consequences for an organization?

Computer 📄 JOA IT (2026)

A. When daily backups are scheduled and maintained B. When daily operations rely on DBMS without adequate backups C. When partial data is stored outside DBMS D. When DBMS is only used for non-essential reports

25. In which situation would the DBMS disadvantage of system failure have the most severe consequences for an organization?

Computer 📄 JOA IT (2026)

A. When daily backups are scheduled and maintained B. When daily operations rely on DBMS without adequate backups C. When partial data is stored outside DBMS D. When DBMS is only used for non-essential reports

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