How to calculate time duration in sql server 2014? [duplicate] - sql-server

Question

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I want to calculate time diff between starttime=23:30 and endtime=00:15 the time diff is coming -23.25
(1 answer)
Closed 5 years ago.
This is My First Condition. suppose CheckIn Time is Greater Than Check Out Time so How Can I calculate Time Duration
StaffName | attendDate| staffid| firmId| Shiftname | AttendId| CheckIn| CheckOut | Total Duration
---------------------------------------------------------------------------------------------
Kiran A Veri | 2017-03-28 |5146 |1 | Night | 34584 |18:00:00| 03:00:00 | 09:00:00
This is my second condition. If check in time is less than checkout time so how to manage both condition in this Query?
StaffName | attendDate| staffid| firmId| Shiftname | AttendId| CheckIn| CheckOut | Total Duration
---------------------------------------------------------------------------------------------
Ritesh B Patel | 2017-03-28 |5146 |1 | General | 34584 |10:06:06| 19:35:46 | 09:29:00

Answer 1

For the first part:
Use a CASE WHEN CheckIn > CheckOut in conjunction with DATEDIFF.
For the second part:
Build a datetime or time field and convert it using Style=108 (hh.mm.ss)
CREATE TABLE TEST(ID int, CheckIn time, CheckOut time);
INSERT INTO TEST VALUES(1, '03:00:00', '10:00:00'),(2, '10:26:13', '03:12:15'),(3, '18:00:00', '03:00:00');
-- Below SQL-Server 2012
SELECT CASE WHEN CheckIn > CheckOut
THEN CONVERT(VARCHAR(20), 86400 - DATEADD(SECOND, DATEDIFF(SECOND, CheckOut, CheckIn), '00:00:00'), 108)
ELSE CONVERT(VARCHAR(20),DATEADD(SECOND, DATEDIFF(SECOND, CheckIn, CheckOut), '00:00:00'), 108)
END Elapsed_Time
FROM TEST
-- SQL-Server 2012 or above
SELECT CASE WHEN CheckIn > CheckOut
THEN FORMAT(86400 - DATEADD(SECOND, DATEDIFF(SECOND, CheckOut, CheckIn), '00:00:00'), 'hh\:mm\:ss')
ELSE FORMAT(DATEADD(SECOND, DATEDIFF(SECOND, CheckIn, CheckOut), '00:00:00'), 'hh\:mm\:ss')
END Elapsed_Time
FROM TEST
GO
| Elapsed_Time |
| :----------- |
| 07:00:00 |
| 16:46:02 |
| 09:00:00 |
| Elapsed_Time |
| :----------- |
| 07:00:00 |
| 04:46:02 |
| 09:00:00 |
dbfiddle here