SQL SELF JOIN: Examples

Examples
Sample Database

#1

SELECT 
    e.first_name || ' ' || e.last_name AS employee,
    m.first_name || ' ' || m.last_name AS manager
FROM
    employees e
        INNER JOIN
    employees m ON m.employee_id = e.manager_id
ORDER BY manager;

#2

SELECT 
    e.first_name || ' ' || e.last_name AS employee,
    m.first_name || ' ' || m.last_name AS manager
FROM
    employees e
        LEFT JOIN
    employees m ON m.employee_id = e.manager_id
ORDER BY manager;

Table List