各单位计算机数量的统计,该如何处理

各单位计算机数量的统计
declare   @dw   nvarchar(50)
select   distinct   @dw=department   from   computers
select   @dw   as   单位,count(*)   as   计算机（台）   from   computers   where   department=@dw

应该如何写循环呢？谢谢。

[解决办法]
select department as 单位,count(*) as [计算机（台）] from computers group by department
[解决办法]
select department as 单位,count(*) as 计算机（台） from computers group by department