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Oracle Database 23ai SQL Associate Sample Questions:

1. What is the output of the following query?
SELECT CURRENT_DATE FROM dual;

A) The current date and time in the database time zone
B) The current date in the session time zone
C) The current date and time in UTC
D) The current date in the database time zone

2. Which SQL function calculates the number of months between two dates?
Response:

A) DATE_DIFF
B) TIME_DIFF
C) MONTHS_BETWEEN
D) DATE_CALC

3. What is the purpose of using external tables in Oracle Database?

A) To create temporary tables for session-specific data
B) To improve the performance of complex queries
C) To store backup copies of database tables
D) To manage data stored in external files using SQL

4. What is the result of the following SQL query?
SELECT COALESCE(NULL, 100, 200) AS result FROM dual;

A) NULL
B) 300
C) 200
D) 100

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: