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Oracle 1Z0-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

1. What is the primary purpose of an index in SQL?

A) To ensure uniqueness of values in a column
B) To enforce data integrity constraints
C) To improve the performance of data retrieval queries
D) To store metadata about a table

2. What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);

A) Return employees with a salary above the average salary
B) Return all employees and their salaries
C) Return employees with a salary equal to the average salary
D) Return employees with a salary below the average salary

3. What will the following query return?
SELECT EXTRACT(YEAR FROM CURRENT_DATE) AS year FROM dual;

A) An error due to incorrect syntax
B) The current year in the database time zone
C) The full date in the session time zone

4. How can a synonym benefit database design?

A) It allows the renaming of columns in a table.
B) It enforces constraints on table columns.
C) It improves query execution time.
D) It provides a consistent reference to database objects, even if their underlying names change.

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

Solutions: