關於SQL查詢？

Question

可能重複：
Employee Manager Report - Sql Server

我有一個Employee表是這樣的：

Eno Ename Mangerid 
1 X  Null 
2 Y  1 
3 Z  2 

但我想結果如下圖所示

Ename Managername 
X  Null 
Y  X 
Z  y 

任何人都可以給我這個答案嗎？

在此先感謝

Answer 1

這應該工作：

select 
    e.Ename, 
    m.Ename as ManagerName 
from employee e 
left join employee m on e.ManagerId = m.Eno 

Answer 2

select e1.Ename employee, e2.Ename manager 
from employee e1 
join employee e2 on e1.ManagerId = e2.Eno 

Answer 3

使用自助加入對員工表

SELECT EMPLOYEE.ENAME as EmployeeName, EMPLOYEE.ENO as ManagerName 
FROM EMPLOYEE 
INNER JOIN EMPLOYEE AS EMPLOYEE_1 
ON EMPLOYEE.ENO = EMPLOYEE_1.MANEGERID 

---

Answer 4

你應該使用遞歸CTE

Recursive Queries Using Common Table Expressions

這樣，您可以根據需要在層次結構中深入瞭解。

Answer 5

Select e.Name, (select m.name from Employee M where M.Eno =e.Mangerid) as Manager 
from Employee e