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Oracle 1Z0-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. What does the EXISTS operator check in a subquery?

A) If the subquery returns any rows
B) If the subquery returns a specific number of rows
C) If the subquery references the outer query
D) If the subquery contains only unique values

3. Which command is used to add a new column to an existing table?

A) ADD COLUMN
B) ALTER COLUMN
C) MODIFY COLUMN
D) ALTER TABLE

4. What is the result of the following query?
SELECT employee_id
FROM employees
WHERE EXISTS (SELECT 1 FROM departments WHERE department_id = 10);

A) All employee IDs
B) Employees with salaries greater than 10
C) Employee IDs from department 10
D) Employee IDs from departments with no employees

5. What is the difference between UNION and UNION ALL?

A) UNION works with subqueries, while UNION ALL does not.
B) UNION removes duplicates, while UNION ALL includes all rows, including duplicates.
C) UNION combines columns, while UNION ALL combines rows.
D) UNION includes all rows, while UNION ALL removes duplicates.

Solutions: