对多个子查询表使用count（*）函数

Question

我的任务是查找以下内容：“就安装在计算机上的软件包的总成本而言，有多少员工使用最昂贵的计算机？”

我能够使用以下方法找到与最昂贵的计算机关联的员工的主键：

With table3 as  
(select comp from PC where tagnum in
(select tagnum from 
(select tagnum, sum(softcost)'Totalcost' from software
group by tagnum) as Table1
where Totalcost = 
(select max(Totalcost)'MaxTotal' 
from
(select tagnum, sum(softcost)'Totalcost' 
from software
group by tagnum
) as Table2
)))
select empnum from PC 
where PC.comp in
 (select comp from table3 where PC.comp = table3.comp)

但是，根据这些结果，我无法找到该员工的人数。知道我该怎么做吗？

我在下面附加了我的数据...

Answer 1

如前所述，如果查询运行良好。那么您可以使用不同的计数来获取正在使用该计算机的员工人数。

With table3 as  
(select comp from PC where tagnum in
(select tagnum from 
(select tagnum, sum(softcost)'Totalcost' from software
group by tagnum) as Table1
where Totalcost = 
(select max(Totalcost)'MaxTotal' 
from
(select tagnum, sum(softcost)'Totalcost' 
from software
group by tagnum
) as Table2
)))
select COUNT( Distinct empnum) from PC 
where PC.comp in
 (select comp from table3 where PC.comp = table3.comp)