传递SQL查询

Question

我想传递一个查询，该查询从tblEmplyee给出如下所示的输出。 我怎么能这样做？

tblEmployee
 empID   empName   manId
  1        A        
  2        B        1
  3        C        2

Output
 name  Manager
  A       -
  B       A
  C       B

Answer 1

这是完美的

利用Right和self加入

  select t2.empName, t1.empName as Manager from tblEmployee t1 
  right Join tblEmployee t2 on t1.empID = t2.manID
  order by empName

Answer 2

您可以执行LEFT JOIN：

SELECT 
      A.empName AS name, 
      B.empName AS Manager 
FROM tblEmployee A
LEFT JOIN tblEmployee B on A.empID=B.manID