关于SQL查询？

Question

可能重复：
Employee Manager Report - Sql Server

我有一个Employee表是这样的：

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

但我想结果如下图所示

Ename Managername 
X  Null 
Y  X 
Z  y 

任何人都可以给我这个答案吗？

在此先感谢

Answer 1

这应该工作：

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

使用自助加入对员工表

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

你应该使用递归CTE

Recursive Queries Using Common Table Expressions

这样，您可以根据需要在层次结构中深入了解。

Answer 5

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