calculate car parking hours in sql server - sql-server

Question

I have one doubt in sql server. How to calculate car login and logout time details?
table: cardetails
Here need to calculate each car how many hours spend in parking area.
creatE TABLE [dbo].[CarDetails](
[carid] [int] NULL,
[DateTimeDetail] [datetime] NULL,
[Flag] [varchar](50) NULL
)
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (1, CAST(N'2019-01-20T19:05:00.000' AS DateTime), N'in')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (1, CAST(N'2019-01-20T22:30:00.000' AS DateTime), N'out')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (2, CAST(N'2019-01-20T20:30:10.000' AS DateTime), N'in')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (2, CAST(N'2019-01-21T02:10:10.000' AS DateTime), N'out')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (3, CAST(N'2019-01-23T07:07:40.000' AS DateTime), N'in')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (3, CAST(N'2019-01-23T10:50:40.000' AS DateTime), N'out')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (3, CAST(N'2019-01-23T11:00:10.000' AS DateTime), N'in')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (3, CAST(N'2019-01-23T14:15:30.000' AS DateTime), N'out')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (2, CAST(N'2019-01-21T08:20:10.000' AS DateTime), N'in')
GO
INSERT [dbo].[CarDetails] ([carid], [DateTimeDetail], [Flag]) VALUES (2, CAST(N'2019-01-21T10:20:10.000' AS DateTime), N'out')
GO
These are the records:
carid DateTimeDetail Flag
1 2019-01-20 19:05:00.000 in
1 2019-01-20 22:30:00.000 out
2 2019-01-20 20:30:10.000 in
2 2019-01-21 02:10:10.000 out
3 2019-01-23 07:07:40.000 in
3 2019-01-23 10:50:40.000 out
3 2019-01-23 11:00:10.000 in
3 2019-01-23 14:15:30.000 out
2 2019-01-21 08:20:10.000 in
2 2019-01-21 10:20:10.000 out
Based on above data I want output like below :
carid | DateTimeDetails | Totaltime(hh:mm:ss)
1 |2019-01-20 | 03:25:00
2 |2019-01-20 | 05 :49:40
2 |2019-01-21 | 02:00:00
3 |2019-01-23 | 06:58:20
I tried like below
select a.carid , sum(datediff(mm,b.datetimedetail,a.datetimedetail))as totalmm from CarDetails a join CarDetails b
on a.carid=b.carid
where a.datetimedetail<=(select max(c.[DateTimeDetail]) from CarDetails c join CarDetails a on a.carid=c.carid
)
group by a.carid
please tell me how to write query to achive this task in sql server

Answer 1

This doesn't quite give you the expected results in your post, however, I have good reason for it not to be, and I suspect your expected results are wrong:
--Because, from experience, people can somehow enter things twice before exiting...
WITH Grp AS(
SELECT CD.carid,
CD.DateTimeDetail,
CD.Flag,
COUNT(CASE Flag WHEN 'Out' THEN 1 END) OVER (PARTITION BY carid ORDER BY CD.DateTimeDetail ASC
ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING) AS Grp
FROM dbo.CarDetails CD),
InOut AS(
SELECT carid,
MIN(CASE Flag WHEN 'In' THEN Grp.DateTimeDetail END) AS TimeIn,
MAX(CASE Flag WHEN 'Out' THEN Grp.DateTimeDetail END) AS [TimeOut]
FROM Grp
GROUP BY carid, grp)
SELECT carid,
CONVERT(date,TimeIn) AS DateTimeDetails,
CONVERT(time(0),DATEADD(SECOND,SUM(DATEDIFF(SECOND,TimeIn, [TimeOut])),'00:00:00')) AS TotalTime
FROM InOut
GROUP BY carid,
CONVERT(date,TimeIn)
ORDER BY carid ASC;
This gives the results below:
carid DateTimeDetails TotalTime
----------- --------------- ----------------
1 2019-01-20 03:25:00
2 2019-01-20 05:40:00
2 2019-01-21 02:00:00
3 2019-01-23 06:58:20
Notice I have a 05:40:00 for car 2 on 2019-01-20. Car 2 enters at 20:30:10 and leaves at 02:10:10, which is 5 hours, and 40 minutes later; not 05 hours 49 minutes and 40 seconds later. if you have that time in your expected results for a reason, you need to explain why.
Note: This will not work if a car stays more than 24 hours! You didn't respond to my question, so I have assumed not. If they can, SQL Server does not support times great than 24 hours, therefore you will be better returning the number of seconds, and having your application display a 24+ hour time.

Answer 2

you can try this
select carid,dateIn, cast(DATEADD(ms, SUM(DATEDIFF(ms, '00:00:00.000', timeout)), '00:00:00.000') as time) timeOut
from (
select carid,cast([DateTimeDetail]as DATE) DateIn ,
(select top 1 [DateTimeDetail]
from [CarDetails] b
where b.carid=a.carid and b.[DateTimeDetail]>a.[DateTimeDetail] and flag='out' )
-[DateTimeDetail] timeOut
from [CarDetails] a
where Flag='in') c
group by carid,dateIn
This gives the results below:
carid dateIn timeOut
1 2019-01-20 03:25:00.0000000
2 2019-01-20 05:40:00.0000000
2 2019-01-21 02:00:00.0000000
3 2019-01-23 06:58:20.0000000