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Oracle Database 23ai SQL Associate Sample Questions:

1. What is the default order of evaluation when multiple SET operators are used in a query?

A) INTERSECT, UNION, MINUS
B) INTERSECT, MINUS, UNION
C) UNION, INTERSECT, MINUS
D) UNION, MINUS, INTERSECT

2. Which INTERVAL data type would you use to store a period of time in years and months?

A) INTERVAL DAY TO SECOND
B) INTERVAL YEAR TO MONTH
C) INTERVAL MINUTE TO HOUR
D) INTERVAL MONTH TO DAY

3. What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);

A) Return employees with a salary above the average salary
B) Return all employees and their salaries
C) Return employees with a salary equal to the average salary
D) Return employees with a salary below the average salary

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

5. Which of the following can be achieved using a correlated subquery?

A) Comparing each employee's salary to the average salary of their department
B) Inserting data into a table
C) Joining two tables without a common column
D) Retrieving duplicate records from a single table

Solutions: