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Oracle Database 23ai SQL Associate Sample Questions:

1. Which type of join retrieves only the rows with matching values in both tables?

A) INNER JOIN
B) CROSS JOIN
C) NATURAL JOIN
D) OUTER JOIN

2. What will the following query do?
DELETE FROM employees
WHERE department_id = 20;

A) Raise an error because DELETE cannot use a WHERE clause
B) Delete the department_id column in the employees table
C) Delete all rows where department_id is 20
D) Delete all rows in the employees table

3. Which SQL function can be used to replace NULL values with a specified value?

A) ISNULL
B) COALESCE
C) REPLACE
D) NVL

4. What is the result of the following query?
SELECT employee_id
FROM employees
WHERE EXISTS (SELECT 1 FROM departments WHERE department_id = 10);

A) Employees with salaries greater than 10
B) Employee IDs from department 10
C) All employee IDs
D) Employee IDs from departments with no employees

5. What does the following SQL query do?
SELECT * FROM employees WHERE salary > 5000 ORDER BY department_id;

A) Retrieves all employees with a salary greater than 5000, sorted by department ID in ascending order
B) Retrieves employees with salary less than 5000, sorted by department ID
C) Retrieves all employees with a salary greater than 5000, sorted by salary in ascending order
D) Retrieves all employees, sorted by department ID

Solutions: