How to convert minutes into HH:MM:SS in SQL?

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I want to calculate sum of working hours of employee into HH:MM:SS and total numbers of days in decimal..

This is my Query...But I'm not getting the actual sum of total hours:minutes:seconds

I want the output like this.

sum of working hours ="52:02:04" and total days=6.5 days (per day 8 hours)

What I have tried:

select isnull(CONVERT(char(8), DATEADD(HH,SUM(DATEDIFF(MINUTE,FROMTIME,TOTIME)), ''), 114),'00:00:00') as 'TotalHours',isnull((sum(DATEDIFF(HH,FROMTIME,TOTIME))/8),'0') as 'TotalDay' FROM TRNSWRKPROGRESS

Posted 16-May-17 18:27pm

Developer29

Updated 16-May-17 20:07pm

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Developer29 · Accepted Answer · 2017-05-16T19:50:00

Finally I got solution..It's working good...

select 
cast(sum(datediff(second,FROMTIME,TOTIME))/3600 as varchar(12)) + ':' + 
        right('0' + cast(sum(datediff(second,FROMTIME,TOTIME))/60%60 as varchar(2)),2) +
        ':' + right('0' + cast(sum(datediff(second,FROMTIME,TOTIME))%60 as varchar(2)),2) as 'Total Hours',
        CAST(sum(DATEDIFF(SECOND, FROMTIME, TOTIME)/28800.0) AS DECIMAL(5,2)) as 'Totaldays'
         from  TRNSWRKPROGRESS