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

2. Which type of join includes rows that do not have matching values in the joined table?

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

3. What happens if a DELETE statement is executed without a WHERE clause?

A) No rows are deleted.
B) All rows in the table are deleted.
C) An error is raised.
D) Only the first row is deleted.

4. What does the following query return?
SELECT department_id FROM departments
INTERSECT
SELECT department_id FROM employees;

A) Department IDs that exist only in the employees table
B) Department IDs that exist in both the departments and employees tables
C) All department IDs from the employees table
D) All department IDs from the departments table

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

Solutions: