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Oracle 1Z0-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

1. Which type of join includes rows that do not have matching values in the joined table?

A) OUTER JOIN
B) SELF JOIN
C) CROSS JOIN
D) INNER JOIN

2. Which of the following statements is true about constraints in Oracle Database?

A) Constraints are automatically dropped when rows are deleted.
B) Constraints can be added or modified using the ALTER TABLE statement.
C) Constraints can only be added when creating a table.
D) Constraints cannot reference other tables.

3. What is a subquery in SQL?

A) A query inside another query
B) A query used for joining two or more tables
C) A query used to create a table
D) A query that combines data from multiple tables

4. Which SQL function can be used to replace NULL values with a specified value?

A) COALESCE
B) REPLACE
C) ISNULL
D) NVL

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 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

Solutions: