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Oracle Database 23ai SQL Associate Sample Questions:

1. Which SQL clause can be used in Oracle to limit the number of rows returned?

A) GROUP BY
B) WHERE
C) DISTINCT
D) FETCH FIRST n ROWS ONLY

2. What happens when a unique index is created on a table column?

A) The column cannot contain duplicate values.
B) The column data type is converted to a primary key.
C) The column values are automatically encrypted.
D) The column can only contain NULL values.

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

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

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

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

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

Solutions: