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

2. What is the purpose of a correlated subquery?

A) A subquery that combines data from multiple tables
B) A subquery that depends on the result of another subquery
C) A subquery that can be used only with aggregate functions
D) A subquery that references columns from the outer query

3. Which operator can be used in a multiple-row subquery to match a single value to a list of values?

A) EXISTS
B) IN
C) =
D) NOT NULL

4. Which of the following ensures that a relational database enforces data integrity?

A) Redundant data storage
B) Hierarchical data organization
C) Indexes on all columns
D) Constraints such as primary keys, foreign keys, and unique constraints

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: