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

2. Which type of subquery returns exactly one value?

A) Multiple-row subquery
B) Inline view
C) Correlated subquery
D) Scalar subquery

3. Which of the following SQL commands retrieves data from a relational database?

A) UPDATE
B) DELETE
C) SELECT
D) INSERT

4. How are NULL values treated in relational databases?

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

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

Solutions: