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Oracle Database 23ai SQL Associate Sample Questions:

1. Which SQL clause is used to specify the source table in a query?

A) FROM
B) SELECT
C) WHERE
D) GROUP BY

2. Which command revokes a user's privilege to update a table?

A) DELETE UPDATE ON table_name FROM user_name;
B) REVOKE UPDATE ON table_name FROM user_name;
C) DENY UPDATE ON table_name FROM user_name;
D) REMOVE UPDATE ON table_name FROM user_name;

3. Which command grants a user the ability to query data from a specific table?

A) ENABLE SELECT ON table_name TO user_name;
B) GRANT ALL ON table_name TO user_name;
C) ALLOW SELECT ON table_name TO user_name;
D) GRANT SELECT ON table_name TO user_name;

4. How are NULL values treated in relational databases?

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

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

Solutions: