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Oracle Database 23ai SQL Associate Sample Questions:

1. What will the following query return?
SELECT TO_CHAR(SYSDATE, 'DD-MM-YYYY') AS formatted_date FROM dual;

A) An error
B) The current date in the default system format
C) The time part of the current date
D) The current date in the format 'DD-MM-YYYY'

2. What does the following SQL statement do?
SELECT e.employee_id, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id;

A) Retrieves employees and departments with matching department_id
B) Retrieves only employees without departments
C) Retrieves all employees and their departments
D) Retrieves only departments with no employees

3. Which clause in an UPDATE statement typically uses a subquery to assign values to columns?

A) HAVING
B) FROM
C) WHERE
D) SET

4. What does the following SQL query do?
SELECT *
FROM employees e
JOIN employees m ON e.manager_id = m.employee_id;

A) Lists employees who are not managers
B) Lists employees who are managers
C) Lists employees and their corresponding managers
D) Lists employees without departments

5. What does the UNION ALL operation do when selecting matching columns from different tables?
SELECT employee_id, salary FROM employees
UNION ALL
SELECT employee_id, bonus FROM bonuses;

A) Combines all employee IDs, salaries, and bonuses, including duplicates
B) Returns only the employees with salaries and bonuses
C) Returns only employees with duplicate employee IDs in both tables
D) Combines the salaries and bonuses for employees, removing duplicates

Solutions: