SQL INNER JOIN: Examples

Examples
Sample Database

#1

SELECT
	department_id,
	department_name
FROM
	departments
WHERE
	department_id IN (1, 2, 3);

#2

SELECT
	first_name,
	last_name,
	department_id
FROM
	employees
WHERE
	department_id IN (1, 2, 3)
ORDER BY
	department_id;

#3

SELECT 
    first_name,
    last_name,
    employees.department_id,
    departments.department_id,
    department_name
FROM
    employees
        INNER JOIN
    departments ON departments.department_id = employees.department_id
WHERE
    employees.department_id IN (1 , 2, 3);

#4

SELECT
	first_name,
	last_name,
	job_title,
	department_name
FROM
	employees e
INNER JOIN departments d ON d.department_id = e.department_id
INNER JOIN jobs j ON j.job_id = e.job_id
WHERE
	e.department_id IN (1, 2, 3);

Table List