SQL View Query need time interval calculation between 2 dates - sql

Question

I have below View Query. While calculating time interval it only display time interval if check Out is for same date. For example if i check in on 11/12/2017 then it i have to check out with same date 11/12/201 n order to calculate time Interval.
But i want to modify it like if i checkout on next day (after 12:00 AM midnight) it should also calculate the time interval.can some help me to modify query to get the desired results?
Query:
ALTER VIEW [dbo].[TimeAttendanceQuery]
AS
SELECT TOP (100) PERCENT
dbo.AxPerson.Name,
dbo.AxPerson.IdNumber AS EmployeeID,
dbo.TimeAttendance.Badge,
dbo.AxPerson.Id,
MIN(dbo.TimeAttendance.EventTime) AS EntryTime,
MAX(dbo.TimeAttendance.EventTime) AS ExitTime,
CAST(DATEDIFF(second, MIN(dbo.TimeAttendance.EventTime), MAX(dbo.TimeAttendance.EventTime)) / 60 / 60 / 24 AS NVARCHAR(50)) +
':' + CAST(DATEDIFF(second, MIN(dbo.TimeAttendance.EventTime), MAX(dbo.TimeAttendance.EventTime)) / 60 / 60 % 24 AS NVARCHAR(50)) + ':' + CAST(DATEDIFF(second, MIN(dbo.TimeAttendance.EventTime), MAX(dbo.TimeAttendance.EventTime)) / 60 % 60 AS NVARCHAR(50))
AS TimeInterval,
dbo.TimeAttendance.Event,
dbo.AxPerson.Type AS ShitType,
dbo.AxPerson.ShiftDesc,
CONVERT(Varchar,dbo.TimeAttendance.EventTime, 101) AS EventTIME
FROM
dbo.AxPerson
INNER JOIN dbo.TimeAttendance ON dbo.AxPerson.Name = dbo.TimeAttendance.Name
GROUP BY dbo.AxPerson.Name, dbo.AxPerson.IdNumber, dbo.TimeAttendance.Badge, CONVERT(Varchar, dbo.TimeAttendance.EventTime, 101), dbo. AxPerson.ShiftDesc, dbo.AxPerson.Id, dbo.TimeAttendance.Event,dbo.AxPerson.Type
ORDER BY dbo.AxPerson.Name, EventTime DESC
GO

Answer 1

I'm not sure about the algorithm you posted, but if you want to get the time difference from two datetimes you can cast the subtraction as time. This works for less than 24 hours. If you also want the number of days (I think this is only good for less than a year), then you can do the datepart-day of the difference.
For example:
DECLARE #starttime datetime = '2017-11-12 010:20:00'
DECLARE #endtime datetime = '2017-11-13 08:00:00'
SELECT DATEPART(DAY, #endtime - #starttime) - 1 [Days Passed]
,CAST(#endtime - #starttime as time(0)) [Time Passed]
--WHERE the (0) in time(0) is for the milliseconds to return.
Gives output:
Days Passed Time Passed
0 21:40:00
If you don't care about the days, then your code could be modified like this:
ALTER VIEW [dbo].[TimeAttendanceQuery]
AS
SELECT Name, EmployeeID, Badge, Id, EntryTime,
CAST(ExitTime - EntryTime as time(0)) [TimeInterval],
Event, ShiftType, ShiftDesc
,CONVERT(Varchar, EventTime, 101) AS EventTIME
FROM (
SELECT
dbo.AxPerson.Name,
dbo.AxPerson.IdNumber AS EmployeeID,
dbo.TimeAttendance.Badge,
dbo.AxPerson.Id,
MIN(dbo.TimeAttendance.EventTime) AS EntryTime,
MAX(dbo.TimeAttendance.EventTime) AS ExitTime,
dbo.TimeAttendance.Event,
dbo.AxPerson.Type AS ShiftType,
dbo.AxPerson.ShiftDesc,
dbo.TimeAttendance.EventTime
FROM dbo.AxPerson INNER JOIN dbo.TimeAttendance
ON dbo.AxPerson.Name = dbo.TimeAttendance.Name
GROUP BY
dbo.AxPerson.Name,
dbo.AxPerson.IdNumber,
dbo.TimeAttendance.Badge,
dbo.AxPerson.Id,
dbo.TimeAttendance.Event,
dbo.AxPerson.Type
dbo.AxPerson.ShiftDesc,
dbo.TimeAttendance.EventTime,
) AS dT