SQL查询以从同一张表中获取员工姓名及其经理姓名

问题描述

员工表

Employee_id  Employee_name   Manager_id
-------------------------------------
Emp00001     Ram             Emp00005
Emp00002     Sharath         Emp00003
Emp00003     Nivas           Emp00005
Emp00004     Praveen         Emp00002
Emp00005     Maharaj         Emp00002

输出

Employee Name    Manager Name
------------------------------
Ram              Maharaj
Sharath          Nivas
Nivas            Maharaj
Praveen          Sharath
Maharaj          Sharath

在employee表中，有三列Employee_id，employee_name和manager_id.从表中，如何获取员工姓名和他们的经理姓名?

In the employee table, there are three columns Employee_id, employee_name and manager_id. From the table, how to fetch the employee name and their manager name?

推荐答案

您可以自联接表以从经理的ID中获取经理的姓名:

You can self-join the table to get the manager's name from his ID:

SELECT e.employee_name, m.employee_name AS manager_name
FROM   employee e
JOIN   employee m on e.manager_id = m.employee_id

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