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Oracle Database 23ai SQL Associate Sample Questions:

1. 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

2. Which type of join includes rows that do not have matching values in the joined table?

A) OUTER JOIN
B) SELF JOIN
C) CROSS JOIN
D) INNER JOIN

3. Which of the following can be achieved using a correlated subquery?

A) Inserting data into a table
B) Joining two tables without a common column
C) Comparing each employee's salary to the average salary of their department
D) Retrieving duplicate records from a single table

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

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

5. What will the following query result in?
SELECT e.employee_id, e.manager_id
FROM employees e
WHERE e.manager_id IS NOT NULL;

A) All employees and their IDs
B) Employees who have managers
C) Employees who do not have managers
D) Employees and their managers' IDs

Solutions: