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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the following query return?
SELECT employee_id
FROM employees
WHERE department_id IN (SELECT department_id FROM departments WHERE location_id = 1000);

A) Employees with salaries greater than 1000
B) Employees with no department
C) Departments located in location ID 1000
D) Employees working in location ID 1000

2. What is a SELF JOIN in SQL?

A) A join used for Cartesian products
B) A join of a table with itself
C) A join between tables with identical structures
D) A join that does not require a WHERE clause

3. Which SQL keyword is used to define a substitution variable in a SQL statement?

A) SET
B) VAR
C) SUBSTITUTION
D) DEFINE

4. 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 below 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 above the average salary

5. Which type of subquery returns exactly one value?

A) Correlated subquery
B) Multiple-row subquery
C) Inline view
D) Scalar subquery

Solutions: