SQL query for finding difference of two time and sum - sql-server

Question

I have this table in SQL Server:
UserId Date Start Time End Time
------------------------------------------------------------------------------------
20 2012-04-02 00:00:00.000 NULL 2012-04-02 09:17:57.000
20 2012-04-02 00:00:00.000 2012-04-02 09:17:57.000 2012-04-02 09:57:55.000
20 2012-04-02 00:00:00.000 2012-04-02 09:57:55.000 2012-04-02 10:04:58.000
20 2012-04-02 00:00:00.000 2012-04-02 10:04:58.000 2012-04-02 10:21:40.000
20 2012-04-02 00:00:00.000 2012-04-02 10:22:15.000 2012-04-02 10:22:20.000
20 2012-04-02 00:00:00.000 2012-04-02 10:22:56.000 2012-04-02 10:23:33.000
I want to find the difference between start time and end time and sum up the difference hours based on date
Output required is:
UserID Time_Duration
-----------------------
20 1:20:20 (this is example not actuals)
Can anyone help me write a SQL query..
I have tried with the below query,
select sum(sub1.TotalSeconds / 3600) as [Hours], sum((sub1.TotalSeconds % 3600) / 60)
as [Minutes],
sum((sub1.TotalSeconds % 3600) % 60) as [Seconds],sub1.Date
from
(
SELECT
sub.UserID,
sub.Date,
sum(datepart(hour, sub.end_time-sub.start_time) * 3600) + sum(datepart(minute, sub.end_time-sub.start_time) * 60) +
sum(datepart(second, sub.end_time-sub.start_time)) as TotalSeconds
from.......
) AS sub
group by sub.UserID,sub.Date,sub.start_time,sub.end_time)
as sub1 group by sub1.Date;
I get the following result
Hours Minutes Seconds Date
3 347 515 2012-04-02 00:00:00.000
But i want to add the minutes if greater then 60 it has to hours as 3+1 hr and so on. Can any 1 help me where Im making mistake

Answer 1

Hi take a look at this:
SQLFIDDLE
It is NOT the most efficient and I believe it's ugly for a code. However put it across for you to see the steps. You may get an idea out of it. Mainly using arimethic operators to get the reusults. There are extra fields as I was using it mainly to show you the data flow. I am sure other approaches are much much efficient in terms of performance. You can try.
Query:
select q.userid, t.date,
q.h + round((q.m + (q.s/60))/60,0) as hh,
round((q.m + (q.s/60)) mod 60,0) as mm,
q.s mod 60 as ss
from
(select t.userid,t.date,
sum(t.hours) as h,
sum(t.minutes) as m,
sum(t.seconds) as s
from (select userid,date,
TIMEDIFF(EndTime, StartTime) as duration,
TIMESTAMPDIFF(hour,starttime,endtime) as hours,
TIMESTAMPDIFF(minute,starttime,endtime) mod 60 as minutes,
TIMESTAMPDIFF(second,starttime,endtime) mod 60 seconds
from datestimes) as t
) as q
;
Resutls
USERID DATE HH MM SS
20 April, 02 2012 00:00:00+0000 13 4 25
Updated Query only with one nested query
Infact you may achieve this with one nested query. Apology as this whole answer is MYSQL based. So hopefully you may take the logic out to implement that using SQL Server syntax :)
select t.userid, t.date,
(sum(t.hours) + round((sum(t.minutes) +
sum(t.seconds)/60)/60,0)) as h,
(round((sum(t.minutes) +
sum(t.seconds)/60) mod 60,0)) as m,
sum(t.seconds) mod 60 as s
from
(select userid, date,
TIMEDIFF(EndTime, StartTime) as duration,
TIMESTAMPDIFF(hour,starttime,endtime) as hours,
TIMESTAMPDIFF(minute,starttime,endtime) mod 60 as minutes,
TIMESTAMPDIFF(second,starttime,endtime) mod 60 seconds
from datestimes) as t
;

Answer 2

You can do this matematically:
Select
CAST(DATEDIFF(SECOND, StartDate, EndDate) / 3600 as VARCHAR) + ':' +
CAST((DATEDIFF(SECOND, StartDate, EndDate) % 3600) / 60 as VARCHAR) + ':' +
CAST(DATEDIFF(SECOND, StartDate, EndDate) % 60 as VARCHAR) as DateDifference
From YourTable
DATEDIFF function gives you difference in seconds between start and end time as integer value. Simple dividing that value with 3600, or 60, you've got hours, or minutes, and with % you've got remain values.

Answer 3

Declare #test table(start datetime,ende datetime)
insert into #test Values ('20120101 10:00','20120101 18:00')
insert into #test Values ('20120101 10:00','20120101 18:13')
insert into #test Values ('20120101 10:00','20120102 18:25')
insert into #test Values ('20120101 10:00','20120101 18:00')
insert into #test Values ('20120101 10:00','20120101 18:00')
Select
FLOOR(Cast(Dummy as Float)) as Days
,DATEPART(Hour,dummy) as Hours
,DATEPART(MINUTE,dummy) as Minutes
,DATEPART(Second,dummy) as Seconds
from
(
Select
DateAdd(second, SUM(DATEDIFF(SECOND,start,ende)),Cast(0 as Datetime)) as Dummy
from #test
) a