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Oracle Database 23ai SQL Associate Sample Questions:

1. How are NULL values treated in relational databases?

A) NULL values are not allowed in relational databases.
B) NULL values are treated as zero.
C) NULL values represent missing or unknown data.
D) NULL values are treated as empty strings.

2. Which statement can be used to undo changes made in a transaction?

A) COMMIT
B) MERGE
C) SAVEPOINT
D) ROLLBACK

3. What does the following query return?
SELECT employee_id
FROM employees
WHERE department_id IN (SELECT department_id FROM departments WHERE location_id = 1000);

A) Employees with no department
B) Employees working in location ID 1000
C) Departments located in location ID 1000
D) Employees with salaries greater than 1000

4. What is the result of the following SQL query?
SELECT COALESCE(NULL, 100, 200) AS result FROM dual;

A) NULL
B) 300
C) 100
D) 200

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

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

Solutions: