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Oracle Database 23ai SQL Associate Sample Questions:

1. What will the following SQL query do?
UPDATE employees
SET salary = salary * 1.1
WHERE department_id = 10;

A) Increase the salary of employees in department 10 by 10%
B) Set the salary to 1.1 for employees in department 10
C) Increase the salary of all employees by 10%
D) Decrease the salary of employees in department 10 by 10%

2. What will the following SQL query return?
SELECT TRUNC(15.678, 2) AS truncated_value FROM dual;

A) 15.67
B) 15.678
C) 15.6
D) 15.68

3. 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

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

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

5. What does the following SQL statement do?
SELECT e.employee_id, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id;

A) Retrieves only departments with no employees
B) Retrieves employees and departments with matching department_id
C) Retrieves only employees without departments
D) Retrieves all employees and their departments

Solutions: