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MYSQL One to Many

Get the Employees Managed by a Single Manager

SELECT e.emp_id , e.first_name , e.last_name FROM employees e INNER JOIN managers m ON m.mgr_id =
e.mgr_id WHERE m.mgr_id = 'M01' ;

Results in:


E02 Erin Macklemore
E04 Ron Sonswan
Ultimately, for every manager we query for, we will see 1 or more employees returned.

Get the Manager for a Single Employee

Consult the above example tables when looking at this example.

SELECT m.mgr_id , m.first_name , m.last_name FROM managers m INNER JOIN employees e ON e.mgr_id =
m.mgr_id WHERE e.emp_id = 'E03' ;


M03 Barrel Jones

As this is the inverse of the above example, we know that for every employee we query for, we will only ever see one corresponding manager.


In this page (written and validated by ) you learned about MYSQL One to Many . What's Next? If you are interested in completing MYSQL tutorial, your next topic will be learning about: MYSQL Server Information.

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