[英]how to count multiple fields in sql
嘿,我發現很多人問的問題與我的相似,但不完全相同。
我有一個存儲IP的數據庫。 有一個服務器字段和一個客戶端字段。 我想瀏覽這兩個字段,並為它們提取所有不同的IP,然后找出每個IP作為客戶端和服務器出現了多少次。
http://forums.devx.com/showthread.php?t=19168 <-這有點相似,但不太完全。
這就是我現在所擁有的:
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
這沒有用,因為我意識到我只查看client_ip字段中的IP。
那么,如何計算每個IP在服務器和客戶端字段中顯示的時間? 我需要先制作一個臨時表嗎?
嘗試這樣的事情:
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
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