Sql server 计算select查询返回的行数

我需要计算以下查询返回的行数

select m.Company_id
from Monitor as m
    inner join Monitor_Request as mr on mr.Company_ID=m.Company_id
    group by m.Company_id
    having COUNT(m.Monitor_id)>=5

我试过以下方法

select COUNT(*) from
(
select m.Company_id
from Monitor as m
    inner join Monitor_Request as mr on mr.Company_ID=m.Company_id
    group by m.Company_id
    having COUNT(m.Monitor_id)>=5)  

它在查询分析器中给出了一条错误消息，其中显示以下内容：

Msg 102，第15级，状态1，第7行“'）附近的语法不正确

---

SQL Server要求从

或
加入
中选择的子查询具有别名

将别名添加到子查询（在本例中为
x
）：

尝试将整个select包装在括号中，然后对其运行计数（*）

语法错误只是由于缺少子查询的别名：

select COUNT(*) from
(
select m.Company_id
from Monitor as m
    inner join Monitor_Request as mr on mr.Company_ID=m.Company_id
    group by m.Company_id
    having COUNT(m.Monitor_id)>=5)  mySubQuery  /* Alias */

这将为他提供一组分组的
计数的行，而不是返回的总行数。实际上，我没有得到结果的计数。这只是一个madeup名称，你可以随意调用它。我想一个更好的名字应该是[MonitorRequestsWith5OrMoreMonitors]，确切地说，如果你喜欢简洁的话：-）有没有考虑过行数？
这对我很有帮助..thnx
select COUNT(*) from
(
select m.Company_id
from Monitor as m
    inner join Monitor_Request as mr on mr.Company_ID=m.Company_id
    group by m.Company_id
    having COUNT(m.Monitor_id)>=5)  x

select count(*)
from
(
   select m.id
   from Monitor as m 
    inner join Monitor_Request as mr 
       on mr.Company_ID=m.Company_id   group by m.Company_id
    having COUNT(m.Monitor_id)>=5
) myNewTable

select COUNT(*) from
(
select m.Company_id
from Monitor as m
    inner join Monitor_Request as mr on mr.Company_ID=m.Company_id
    group by m.Company_id
    having COUNT(m.Monitor_id)>=5)  mySubQuery  /* Alias */