Merge two rows with condition SQL View - sql

Question

I have a View which has a SQL Script as:
Select
a.iAssetId,
ac.eEventCode,
vm.dtUTCDateTime,
g.iGeofenceId,
g.sGeofenceName,
c.sCategoryName,
c.iCategoryId,
s.sSiteName,
s.iSiteId,
CASE WHEN ac.eEventCode = 6 THEN vm.dtUTCDateTime ELSE NULL END as EnterTime,
CASE WHEN ac.eEventCode = 7 THEN vm.dtUTCDateTime ELSE NULL END as ExitTime,
CASE WHEN
a.iAssetId = Lead(a.iAssetId) OVER (ORDER BY a.iAssetId)
AND g.iGeofenceId = Lead(g.iGeofenceId) OVER (ORDER BY a.iAssetId)
AND ac.eEventCode != Lead(ac.eEventCode) OVER (ORDER BY a.iAssetId)
THEN DATEDIFF(minute, vm.dtUTCDateTime, Lead(vm.dtUTCDateTime) OVER (ORDER BY a.iAssetId)) ELSE NULL END as Test
From AssetCommunicationSummary ac
Inner join VehicleMonitoringLog vm on vm.iVehicleMonitoringId = ac.iVehicleMonitoringId
Inner Join Geofences g on g.iGeofenceId = vm.iGeofenceId
Inner Join Assets a on a.iAssetId = ac.iAssetId
Inner Join Categories c on c.iCategoryId = a.iCategoryId
Inner Join Sites s on s.iSiteId = c.iSiteId
Where ac.eEventCode = 6 OR ac.eEventCode = 7
Group by
a.iAssetId,
ac.eEventCode,
vm.dtUTCDateTime,
g.iGeofenceId,
g.sGeofenceName,
c.sCategoryName,
c.iCategoryId,
s.sSiteName,
s.iSiteId
I have used Lead to calculate the Time differenc in minutes for leading rows based on conditions.
I need to now merge the leading Row and the Current Row based on Condition.
Is there a possible way to do this?
The goal is to get the EnterTime and ExitTime in the Same Row with Time Difference in the Column Next to it.
My result is like this:

Answer 1

If your eventcode is always going to be 6 and 7, then you can just join to that table twice using that clause in the join itself. I think I've got the rest of your schema joined up properly below, but if not, you can adjust it around to fit.
Select
a.iAssetId,
vmEnter.dtUTCDateTime,
g.iGeofenceId,
g.sGeofenceName,
c.sCategoryName,
c.iCategoryId,
s.sSiteName,
s.iSiteId,
vmEnter.dtUTCDateTime as EnterTime,
vmExit.dtUTCDateTime as ExitTime,
DATEDIFF(minute, vmEnter.dtUTCDateTime, vmExit.dtUTCDateTime) as ExitTime,
From Sites s
Inner Join Categories c on s.iSiteId = c.iSiteId
Inner Join Assets a on c.iCategoryId = a.iCategoryId
Inner Join AssetCommunicationSummary acEnter on a.iAssetId = acEnter.iAssetId and acEnter.eEventCode = 6
Inner Join VehicleMonitoringLog vmEnter on vmEnter.iVehicleMonitoringId = acEnter.iVehicleMonitoringId
Inner Join AssetCommunicationSummary acExit on a.iAssetId = acExit.iAssetId and acExit.eEventCode = 7
Inner Join VehicleMonitoringLog vmExit on vmExit.iVehicleMonitoringId = acExit.iVehicleMonitoringId
Inner Join Geofences g on g.iGeofenceId = vmEnter.iGeofenceId

Answer 2

You can use this ddl to test and see the idea of what is going on. It's copy and paste ready, if you want to see a difference in times, make sure you wait before you insert each record.
Create table testing
(
Id int ,
Enter DateTime,
Exitt DateTime,
Eventt int,
GeoCode int
)
insert into testing values (1, GETDATE(),null,6,10)
insert into testing values (1, null,GETDATE(),7,10)
insert into testing values (1, GETDATE(),null,6,11)
insert into testing values (1, null,GETDATE(),7,11)
insert into testing values (2, GETDATE(),null,6,10)
insert into testing values (2, null,GETDATE(),7,10)
create table #temp1
(
Id int, EnterTime datetime, GeoCode int
)
create table #temp2
(
Id int, ExitTime datetime, GeoCode int
)
insert into #temp1
Select Id, MAX(Enter), GeoCode from testing where Eventt = 6 group by Id,GeoCode
insert into #temp2
Select Id, MAX(Exitt),GeoCode from testing where Eventt = 7 group by Id,GeoCode
Select t1.Id, t1.EnterTime,t2.ExitTime, t1.GeoCode, DATEDIFF(ss,t1.EnterTime,t2.ExitTime)
from #temp1 t1
inner join #temp2 t2 on t2.Id = t1.Id
and t1.GeoCode = t2.GeoCode
This is basically pseudo code so your going to need to modify, but everything you need is here.

Answer 3

Im gonna guess that eventcode = 6 means thats the intake time
if so two of your data paris dont make much sense as the exit time is before the intake time,
The Query below only accounts for when amd if eventcode 6 = intake time
and the fact that exit time should be before entertime.
query is based on the output you provided and not the view query.
if doing a select * on your view table gives you that output then replace vw_table with yourviewstablename
There are Nulls in the timedif of sqlfiddle because
there was only one instance of assetid 2
assetid 4 and 6 have exit time that happened before entertimes
SQLFIDDLE
select
v1.iAssetid,
v1.EnterTime,
v2.ExitTime,
datediff(minute, v1.Entertime, v2.Exittime) timedif
from vw_table v1
left join vw_table v2 on
v1.iAssetid= v2.iAssetid
and v1.sCategoryNamea = v2.sCategoryNamea
and v2.eEventcode = 7
and v2.dtUTCDatetime >= v1.dtUTCDatetime
where
v1.eEventcode = 6

Answer 4

You can merge two result sets by adding Row_Number to them and then join on that. Like
SELECT DISTINCT tbl1.col1, tbl2.col2
FROM
(SELECT FirstName AS col1, ROW_NUMBER() OVER (ORDER BY FirstName) Number FROM dbo.UBUser) tbl1
INNER JOIN
(SELECT LastName AS col2, ROW_NUMBER() OVER (ORDER BY LastName) Number FROM dbo.UBUser) tbl2
ON tbl1.Number = tbl2.Number
This way you will be able to have EnterTime and ExitTime in the Same Row with Time Difference in the Column Next to it.

Answer 5

Try this
SELECT iAssetid,
iGeoFenceId,
iGeoFenceName,
sCategoryNamea,
iCategoryid,
sSiteName,
Max(EnterTime) As EnterTime,
Min(ExitTime) As ExitTime,
Datediff(minute, Max(EnterTime), Min(ExitTime)) As Timediff
FROM #vw_Table
GROUP BY iAssetid,
iGeoFenceId,
iGeoFenceName,
sCategoryNamea,
iCategoryid,
sSiteName