Can't convert time to mm:ss - sql-server

Question

I have a table with 7 columns:
Start_hour | Start_minute | Start_second | End_hour | End_minute | end_second | date
My task is to sum the differences between start and end times on current day. And my query already does that. Sadly I need the output to be in minutes:seconds only. For Example the total sum of time differences is 2 hour 26 minutes and 52 seconds.
I need my output to like this:
126:52
My query right now looks like this:
SELECT
RIGHT(CONVERT(CHAR(8),
DATEADD(SECOND,
SUM(DATEDIFF(SECOND,
Timefromparts(start_hour, start_minute, start_second, 0, 0),
Timefromparts(end_hour, end_minute, end_second, 0, 0))
), 0), 108), 5)
FROM
opoznienia
WHERE
YEAR(data) = YEAR(GETDATE())
AND MONTH(data) = MONTH(GETDATE())
AND DAY(data) = DAY(GETDATE())
Sample data:
Start_hour | Start_minute | Start_second | End_hour | End_minute | end_second | date
10 15 0 10 30 30 2018-11-27 14:40:53.680
10 15 0 10 30 30 2018-11-30 10:16:20.610
6 10 30 6 23 45 2018-12-02 01:00:27.243
8 10 0 8 53 45 2018-12-02 14:42:48.663
10 5 13 10 55 23 2018-12-02 14:53:03.560
Output of the query above:
47:13 (without RIGHT command it would be 01:47:13)
The wanted output:
107:13

Answer 1

You need to calculate the number of seconds and then format it as you want. From number of seconds you can calculate the minutes as division by 60, where the remainder are the seconds:
declare #NumberOfSeconds int = 7612
-- Returns 126:52
select concat(#NumberOfSeconds / 60, ':', FORMAT(#NumberOfSeconds % 60, 'D2'))

Answer 2

Here is one option:
SELECT
numSeconds,
CASE WHEN numSeconds / 60 <= 100
THEN RIGHT('00' + CONVERT(VARCHAR(20), numSeconds / 60), 2)
ELSE CONVERT(VARCHAR(20), numSeconds / 60) END
+ ':' +
CASE WHEN numSeconds / 60 <= 100
THEN RIGHT('00' + CONVERT(VARCHAR(20), numSeconds % 60), 2)
ELSE CONVERT(VARCHAR(20), numSeconds % 60) END AS output
FROM yourTable;
Demo
The ugliness in the code has to do with that you expect a minimum of two digits for the minute and second components. So, we have to pad each component with zeroes in the case where minutes or seconds happens to be just a single digit.

Answer 3

The other answers are better, but to understand what may be missing in what you're trying to do - you can look at following where DatePart is used.
-->"
..(without RIGHT command it would be 01:47:13)
" This is your clue that you that you need to work with the parts and not the whole...
SELECT Cast
(
Datepart
(
hour,
DATEADD(second,sum(datediff(second,
TIMEFROMPARTS ( Start_hour, Start_minute, Start_second, 0, 0),
TIMEFROMPARTS ( End_hour, End_minute, End_second, 0, 0))),0)
) * 60
+
Datepart
(
minute,
DATEADD(second,sum(datediff(second,
TIMEFROMPARTS ( Start_hour, Start_minute, Start_second, 0, 0),
TIMEFROMPARTS ( End_hour, End_minute, End_second, 0, 0))),0)
) As varchar)
+
':'
+
Cast
(
Datepart
(
second,
DATEADD(second,sum(datediff(second,
TIMEFROMPARTS ( Start_hour, Start_minute, Start_second, 0, 0),
TIMEFROMPARTS ( End_hour, End_minute, End_second, 0, 0))),0)
) As varchar) as result
from minsec

Answer 4

Try the following
CREATE TABLE T(
StartHour INT,
StartMinute INT,
StartSecond INT,
EndHour INT,
EndMinute INT,
EndSecond INT,
[Date] DATE
);
INSERT INTO T VALUES
(10, 15, 0 , 10, 30, 30, '2018-11-27'),
(10, 15, 0 , 10, 30, 30, '2018-11-30'),
(6 , 10, 30, 6 , 23, 45, '2018-12-02'),
(8 , 10, 0 , 8 , 53, 45, '2018-12-02'),
(10, 5 , 13, 10, 55, 23, '2018-12-02');
SELECT *,
CAST( (DATEDIFF(Hour, StartTime, EndTime) * 60) +
(DATEDIFF(Minute, StartTime, EndTime) % 60) AS VARCHAR
) + ':' +
CAST(DATEDIFF(Second, StartTime, EndTime) % 60 AS VARCHAR)
FROM
(
SELECT [Date],
TIMEFROMPARTS(StartHour, StartMinute, StartSecond, 0, 0) StartTime,
TIMEFROMPARTS(EndHour, EndMinute, EndSecond, 0, 0) EndTime
FROM T
) TT
You can also SUM() and GROUP BY [Date] if you want to.
SELECT [Date],
CAST( SUM( (DATEDIFF(Hour, StartTime, EndTime) * 60) +
(DATEDIFF(Minute, StartTime, EndTime) % 60)
) AS VARCHAR
) + ':' +
CAST(SUM(DATEDIFF(Second, StartTime, EndTime) % 60) AS VARCHAR)
FROM
(
SELECT [Date],
TIMEFROMPARTS(StartHour, StartMinute, StartSecond, 0, 0) StartTime,
TIMEFROMPARTS(EndHour, EndMinute, EndSecond, 0, 0) EndTime
FROM T
) TT
GROUP BY [Date]
Demo
UPDATE
It seems like you are looking for
SELECT [Date],
CAST(SUM(DATEDIFF(Second, StartTime, EndTime)) / 60 AS VARCHAR) + ':' +
CAST(SUM(DATEDIFF(Second, StartTime, EndTime)) % 60 AS VARCHAR) [MM:SS]
FROM
(
SELECT [Date],
TIMEFROMPARTS(StartHour, StartMinute, StartSecond, 0, 0) StartTime,
TIMEFROMPARTS(EndHour, EndMinute, EndSecond, 0, 0) EndTime
FROM T
) TT
GROUP BY [Date];
Returns:
+---------------------+--------+
| Date | MM:SS |
+---------------------+--------+
| 27/11/2018 00:00:00 | 15:30 |
| 30/11/2018 00:00:00 | 15:30 |
| 02/12/2018 00:00:00 | 107:10 |
+---------------------+--------+
Demo