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Oracle Database 23ai SQL Associate Sample Questions:

1. 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) Returns only employees with duplicate employee IDs in both tables
D) Combines the salaries and bonuses for employees, removing duplicates

2. Which data dictionary view lists all indexes created by the current user?

A) USER_INDEXES
B) INDEX_LIST
C) DBA_INDEXES
D) ALL_INDEXES

3. Which component of an ERD (Entity-Relationship Diagram) represents the attributes of an entity?

A) Diamonds
B) Ovals
C) Rectangles
D) Arrows

4. What is a subquery in SQL?

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

5. What will the following query do?
DELETE FROM employees
WHERE department_id = 20;

A) Raise an error because DELETE cannot use a WHERE clause
B) Delete the department_id column in the employees table
C) Delete all rows in the employees table
D) Delete all rows where department_id is 20

Solutions: