Write a SQL query to return each employee name along with their manager name from a table with columns emp_id, emp_name, and manager_id where manager_id can be NULL.
Use the employees table. Include every employee, represent missing managers with NULL, and sort the results by emp_id.
employee_name, manager_name| Column | Type | Description |
|---|---|---|
| emp_idPK | INT | Unique employee identifier |
| emp_name | VARCHAR(100) | Employee full name |
| manager_id | INT | Identifier of the employee's manager |