How to count the affected rows in complex sql queries?

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I have to display a number of entries on my c# Form application. I have a sql query that gives me the result. However this sql query is joining two other tables. Here is the query:

SQL

SELECT  
People.FirstName, 
People.MiddleName,      
People.LastName, 
People.Class, 
LogonStats.DateTime, 
LogonStats.IP

FROM         
LogonStats INNER JOIN People ON LogonStats.Logon = People.ID

WHERE DateTime >= DATEADD(day,-7, GETDATE())

ORDER BY DateTime DESC

So what basically does this query is that gives me the people who visit the website in last 1 week. I'd like to know how many people visited. I can user Count() for one table however I couldn't make it work on this query. Is there anyway to make it work?

Posted 16-May-14 8:43am

fatihkaratay

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Jörgen Andersson · Accepted Answer · 2014-05-16T09:57:00

This will add the number of unique users to your query

SQL

WITH stats AS (
    SELECT  
            LogonStats.DateTime, 
            LogonStats.IP
            LogonStats.Logon
    FROM    LogonStats
    WHERE   DateTime >= DATEADD(day,-7, GETDATE())
    )
,cnt AS (
    SELECT  Count(DISTINCT LogonStats.Logon) Unique_users
    FROM    stats
    )
SELECT  
        People.FirstName, 
        People.MiddleName,      
        People.LastName, 
        People.Class, 
        Stats.DateTime, 
        Stats.IP,
        Unique_users
FROM    Stats
JOIN    People ON LogonStats.Logon = People.ID
JOIN    cnt
ORDER BY DateTime DESC