get drive period and stop period from gps Table - sql

Question

I have a table which contains gps data.
It saves a record every 30 Seconds
A record contains speed (float), CurrTime (datetime) and CarID (int)
How can I get (for each car and day) those values :
total drive period
total stop period
Stop means its speed must be <5 for continous 15 minutes
For example :
car1 on 7/7/2017
stopped for 10 Hours
drive for 14 hours
Table Definition
CREATE TABLE [dbo].[T_Tracking](
[id] [int] ,
[IMEI] [nvarchar](50) NULL,
[TrackTime] [datetime] NULL,
[CurrTime] [datetime] NULL CONSTRAINT [DF_T_Tracking_CurrTime] DEFAULT (getutcdate()),
[Longitude] [nvarchar](50) NULL,
[Lattitude] [nvarchar](50) NULL,
[speed] [float] NULL,
[SafeAreaID] [int] NULL,
[GeoFenceID] [int] NULL,
[CarID] [int] NULL,
[Country] [nvarchar](50) NULL,
[City] [nvarchar](50) NULL,
[Area] [nvarchar](50) NULL,
[Street] [nvarchar](50) NULL,
[FullAddress] [nvarchar](150) NULL,
[Distance] [float] NULL )
This SQLFiddle is auto-populated with table definition and some data examples
(Parking)
To ignore trafic stops
Data Examples
Expected Data
CarName Date DrivePeriod StopPeriod
Car1 7/7/2017 16 8
Car2 7/7/2017 14 10
car3 7/7/2017 12 12
car1 6/7/2017 15 9
My try
SELECT carid
,sum( LAG( TrackTime, 1, Null) OVER (PARTITION BY carid ORDER BY carid)- TrackTime)
FROM T_Tracking
group by carid
Error encountered
Msg 8120, Level 16, State 1, Line 2
Column 'T_Tracking.TrackTime' is
invalid in the select list because it is not contained in either an
aggregate function or the GROUP BY clause.
Msg 4109, Level 15, State 1, Line 2
Windowed functions cannot be used in the context of another
windowed function or aggregate.
Try 2
SELECT
carid
, TrackTime
, LAG( TrackTime, 1, Null) OVER (PARTITION BY carid ORDER BY carid) as trackold
, CONVERT(date, TrackTime) as TrackDay
, speed,DATEDIFF(minute, LAG( TrackTime, 1, Null) OVER (PARTITION BY carid ORDER BY carid),TrackTime)
FROM T_Tracking
result
the problem here when the lag record on another day it get wrong subtarction
i need to put a contition to be in the same day

Answer 1

Build a CTE that calculates for each column if it is considered as stopped or not
+ a GROUP BY YEAR(CurrTime), MONTH(CurrTime), DAY(CurrTime), CarId, Stopped will do the job.
Then you only have to SUM() the amount of time between a current record time
and its LAG() value and it's done.
WITH CTE "Common Table Expression" (starting with SQL Server 2008)
GROUP BY (starting with SQL Server 2008)
SUM Function (starting with SQL Server 2008)
LAG Function (starting with SQL Server 2012)
Easy to tell, that if you are under SQL Server 2008 this will be very tricky to achieve.
If you are under SQL Server 2012 you can replace the LAG function with a sub-select for example.
Example of query
WITH Stopped
AS
( CTE_query_definition )
SELECT
YEAR(CurrTime)
,MONTH(CurrTime)
,DAY(CurrTime)
,CarID
,Stopped
,SUM(CurrTime - LAG(CurrTime) OVER ( order_by_clause ))
FROM [dbo].[T_Tracking]
GROUP BY YEAR(CurrTime),MONTH(CurrTime),DAY(CurrTime),CarID,Stopped
Then you just have to replace ( CTE_query_definition) and order_by_clause to achieve your goal