层次查询sql server 2008

【问题标题】：hierarchy query sql server 2008层次查询sql server 2008
【发布时间】：2012-10-13 16:37:13
【问题描述】：

EmployeeId, Name, ManagerId
1,Mac Manager, null
2,Sue Supervisor, 1
3,Earl Employee, 2
4,Sam Supervisor, 1
5,Ella Employee, 4

Given: Employee Id = 3

你能帮我用 sql 让员工和经理上链吗？

在这个例子中，结果是

Earl
Sue
Mac

【问题讨论】：

标签： sql-server-2008

【解决方案1】：

看看Recursive Queries Using Common Table Expressions

declare @EmpID int = 3;

with C as
(
  select E.EmployeeId,
         E.Name,
         E.ManagerId
  from YourTable as E
  where E.EmployeeId = @EmpID
  union all
  select E.EmployeeId,
         E.Name,
         E.ManagerId
  from YourTable as E
    inner join C  
      on E.EmployeeId = C.ManagerId
)
select C.Name
from C

SE-Data

【讨论】：

【解决方案2】：

declare @current int 
set @current = @empid
while @current is not null begin

   -- do something with it
   print @current

   set @current = (select ManagerId from table where EmployeeId = @current)
end

【讨论】：