从同一个表中获取员工姓名和经理姓名的 SQL 查询

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

您可以自行加入表格，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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