Question

嘿，我发现很多人都在问类似我的问题，但不完全一样。

我有一个存储IP的数据库。有一个服务器字段和一个客户端字段。我想查看这两个字段并为它们提取所有不同的IP，然后找出每个IP作为客户端和服务器的出现次数。

http://forums.devx.com/showthread.php?t=19168＆lt; - 这有点相似但不完全。

这就是我现在所拥有的：

use mydb   
select y.client_ip as "IP",  
(select count(*)  
from t_Events x  
where start_time BETWEEN '10/7/2010 08:00:00 AM' AND '10/7/2010 04:00:00 PM' AND     x.client_ip = y.client_ip) as "Count of client IP",  
(select count(*)  
from t_Events x  
where start_time BETWEEN '10/7/2010 08:00:00 AM' AND '10/7/2010 04:00:00 PM' AND   x.client_ip = y.server_ip) as "Count of Server IP"  
from t_Events y  
Group By y.client_ip, y.server_ip

这不起作用，因为我意识到我只是在查看client_ip字段中的IP。

那么，我怎样才能算出每个IP在服务器和客户端字段中显示的时间？我是否需要先制作临时表？

Answer 1

尝试这样的事情：

select IP, sum(ClientCount) as ClientCount, sum(ServerCount) as ServerCount
from (
    select client_ip as IP, count(*) as ClientCount, null
    from t_Events
    where start_time BETWEEN '10/7/2010 08:00:00 AM' AND '10/7/2010 04:00:00 PM'
    group by client_ip 
    union all
    select server_ip as IP, null, count(*) as ServerCount
    from t_Events
    where start_time BETWEEN '10/7/2010 08:00:00 AM' AND '10/7/2010 04:00:00 PM'
    group by server_ip 
) a
group by IP

如何计算sql中的多个字段

1 个答案: