は、私はあなたが選択CONCAT（m.first_name、 ''、m.last_name）の後に、ASキーワードを必要とする従業員

Question

select concat(m.first_name, ' ' , m.last_name) manager_id, 
    concat(e.first_name, ' ' , e.last_name) employee_id  

from employees e 
left join employees m on m.employee_id = e.manager_id 

order by manager_id; 

Answer 1

SELECT CONCAT(m.first_name, ' ' , m.last_name) AS mgr_Fullname, 
manager_id AS Supervisor, 
CONCAT(e.first_name, ' ' , e.last_name) AS emp_Fullname, 
employee_id AS Employee FROM employees e LEFT JOIN employees m 
ON m.employee_id = e.manager_id ORDER BY manager_id;