SQL 服务器 : get max value between a range of values with additional data

Question

大多数人都想要最大值，但我需要范围内的最大值加上额外的数据。例如，我有一个团队及其经理及其经理 ID 的列表。我查看了 google/stackoverflow，但大多数人只想要最大值，但我也需要额外的列，这就是我问这个问题的原因。

表 1:

team  mgr_level mgr_id
-----------------------
aa     1          111
aa     2          222 
aa     3          333
bb     1          111
bb     2          222
cc     1          111
cc     2          222
cc     3          444 
cc     4          888 

表2:

employee       emp_id   team
------------------------------
smith, mary      23     aa
jones, john      34     bb 
ramjet, roger    98     cc
james, adam      111    mgr_team
green, rachel    222    mgr_team
bruin, breezly   333    mgr_team
runner, road     444    mgr_team
potter, harry    888    mgr_team

我需要选择 222 到 444 之间的最大值 (mgr_id) 以及其他数据(团队和 mgr_id)。

需要如下所示的结果。有没有一种方法可以一步完成，而不是分两步完成？

name           team   primary_mgr_id  manager_name
-----------------------------------------------
smith, mary     aa      333           bruin, breezly
jones, john     bb      222           green, rachel  
ramjet, roger   cc      444           runner, road

我试过了，SQL Server 不断为每个名称返回多行:我做错了什么？

select max(mgr_id) as [primary_mgr_id], t2.employee, t1.mgr_id
from table2 t2
inner join table1 t1 on t2.team = t2.team
group by t2.employee, t1.mgr_id

感谢您的帮助。斯文

Answer 1

One Option is with the help of a Row_Number()

Select Name = A.Employee
      ,A.Team
      ,primary_mgr_id = B.Mgr_ID
      ,manager_name   = B.manager_name
From  Table2 A
Join (
        Select A.*
              ,manager_name = employee
              ,RN = Row_Number() over (Partition By A.Team Order by A.mgr_level desc)
         From Table1 A
         Join Table2 B on (A.Mgr_ID=B.Emp_ID)
         Where mgr_id between 222 and 444
     ) B on A.Team=B.Team and B.RN=1 

返回

Name            Team    primary_mgr_id  manager_name
smith, mary     aa      333             bruin, breezly
jones, john     bb      222             green, rachel
ramjet, roger   cc      444             runner, road

Another Option is to use a CROSS APPLY

Select Name = A.Employee
      ,A.Team
      ,primary_mgr_id = B.Mgr_ID
      ,manager_name   = B.employee
From  Table2 A
Cross Apply (
        Select Top 1 C.*,D.employee 
         From  Table1 C
         Join  Table2 D on (emp_id = mgr_id)
         where C.Team=A.Team and mgr_id between 222 and 444 Order by mgr_level desc
      ) B