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How to aggregate hours based on service type and date?

Last Modified: 2015-02-26

I would like to modify the query below so that it aggregates the DailyHours based on service type and Entry Day.  I would like the results for 1/21 to be one row and looks like:

Ruben       De Luna      01/21/2015      150.00      2      14970            0      2015-01-21 13:15:00.000

My current MS SQL server query is below:

            (U.FirstName + ISNULL(U.MiddleName, ' ')) AS FirstName,  
            CONVERT(VARCHAR(15), N.StartTime, 101) AS EntryDay,
            SUM(N.Duration) AS DailyHours,
            N.UserId AS StudentId,
            FROM [Notes_Student] AS N WITH (NOLOCK)
            INNER JOIN [User] AS U WITH (NOLOCK) ON N.UserId = U.Id AND U.Id <> 725
            WHERE  (N.LocationId = 379 AND N.[Attendance] = 1 AND N.UserId = 14970 AND N.StartTime BETWEEN '1/1/2015' AND '1/31/2015')
            GROUP BY U.LastName, U.FirstName, U.MiddleName, N.ServiceType, N.Subject, CONVERT(VARCHAR(15), N.StartTime, 101), N.StartTime, N.UserId;
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