select datediff(hour, 0, cast(CallTime as time)), DATEADD(ms, SUM(DATEDIFF(ms, '00:00:00.000', convert(varchar(10), dateadd(second, Duration, 0), 108))), '00:00:00.000') as time from NT_API_CallLogs WHERE Duration <> 0 AND cast(CallTime as date) = '2017-3-08' GROUP BY datediff(hour, 0, cast(CallTime as time) ) ORDER BY datediff(hour, 0, cast(CallTime as time) )
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