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
 ;