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Oracle Database 23ai SQL Associate Sample Questions:

1. What happens when the maximum value of a sequence is reached?

A) The sequence starts decrementing values.
B) The sequence resets to the starting value if the CYCLE option is specified.
C) An error is raised, and the sequence must be recreated.
D) The sequence stops generating values.

2. What does the following SQL statement do?
SELECT e.employee_id, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id;

A) Retrieves all employees and their departments
B) Retrieves employees and departments with matching department_id
C) Retrieves only departments with no employees
D) Retrieves only employees without departments

3. What is the primary purpose of a primary key in a relational database?

A) To uniquely identify each record in a table
B) To sort data in ascending order
C) To establish relationships between tables
D) To store duplicate data in a table

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

5. Which Oracle SQL function returns the current date and time, including time zone information?

A) SYSDATE
B) CURRENT_TIMESTAMP
C) CURRENT_DATE
D) NOW

Solutions: