获取每条日志消息的主机数量

Question

我的表结构是：

[Event Time]
[Log Message] 
[Hostname] 
[Client]

我是否可以获得每条日志消息的唯一主机数量？

我可以使用下面的方法获取每个客户端的每条日志消息的总计数，但我试图获取每条日志消息的唯一主机数

Select sub.* 
From (SELECT Count([Event Time]) AS test
             ,[Log Message]
             ,[Client]
      FROM   [Severe_logs].[dbo].[Severe_logs]
      Group BY [Client], [Log Message]
     )sub
WHERE sub.test > 25
ORDER BY test DESC

我想要的输出是

Count - Log Message - Client
5        log x         Client1
6        log x         Client 2

我该怎么做？

由于

Answer 1

您可以使用不同的计数

Select sub.* 
From (SELECT Count(distinct hostname) AS test
             ,[Log Message]
             ,[Client]
      FROM   [Severe_logs].[dbo].[Severe_logs]
      Group BY [Client], [Log Message]
     )sub
WHERE sub.test > 25
ORDER BY test DESC