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Oracle Database 23ai SQL Associate Sample Questions:

1. Which SQL JOIN keyword retrieves all rows from both tables, including those without matches?

A) CROSS
B) LEFT
C) FULL OUTER JOIN
D) RIGHT

2. Which SET operator returns rows from the first query that are not present in the second query?

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

3. What does the EXISTS operator check in a subquery?

A) If the subquery contains only unique values
B) If the subquery returns a specific number of rows
C) If the subquery references the outer query
D) If the subquery returns any rows

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

5. Which clause is used to ensure that only specific rows are deleted in a DELETE statement?

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

Solutions: