SQL: Group By on Consecutive Records Part 2 - sql

Question

Problem 1
I have the following table which shows the location of a person at 1 hour intervals
Id EntityID EntityName LocationID Timex delta
1 1 Mickey Club house 0300 1
2 1 Mickey Club house 0400 1
3 1 Mickey Park 0500 2
4 1 Mickey Minnies Boutique 0600 3
5 1 Mickey Minnies Boutique 0700 3
6 1 Mickey Club house 0800 4
7 1 Mickey Club house 0900 4
8 1 Mickey Park 1000 5
9 1 Mickey Club house 1100 6
The delta increments by +1 every time the location changes.
I would like to return an aggregate grouped by delta as per example below.
EntityName LocationID StartTime EndTime
Mickey Club house 0300 0500
Mickey Park 0500 0600
Mickey Minnies Boutique 0600 0800
Mickey Club house 0800 1000
Mickey Park 1000 1100
Mickey Club house 1100 1200
I am using the following query which was taken and adapted from here
SQL: Group By on Consecutive Records
(which works fine):
select
min(timex) as start_date
,end_date
,entityid
,entityname
,locationid
,delta
from
(
select
s1.timex
,(
select
max(timex)
from
[locationreport2] s2
where
s2.entityid = s1.entityid
and s2.delta = s1.delta
and not exists
(
select
null
from
[dbo].[locationreport2] s3
where
s3.timex < s2.timex
and s3.timex > s1.timex
and s3.entityid <> s1.entityid
and s3.entityname <> s1.entityname
and s3.delta <> s1.delta
)
) as end_date
, s1.entityid
, s1.entityname
, s1.locationid
, s1.delta
from
[dbo].[locationreport2] s1
) Result
group by
end_date
, entityid
, entityname
, locationid
, delta
order by
1 asc
However I would like to not use the delta (it takes effort to calculate and populate it); instead I am wondering if there is any way to calculate it as part / whilst running the query.
I wouldn’t mind using a view either.
 
Problem 2
I have the following table which shows the location of different people at 1 hour intervals
Id EntityID EntityName LocationID Timex Delta
1 1 Mickey Club house 0900 1
2 1 Mickey Club house 1000 1
3 1 Mickey Park 1100 2
4 2 Donald Club house 0900 1
5 2 Donald Park 1000 2
6 2 Donald Park 1100 2
7 3 Goofy Park 0900 1
8 3 Goofy Club house 1000 2
9 3 Goofy Park 1100 3
I would like to return an aggregate grouped by person and location.
For example
EntityID EntityName LocationID StartTime EndTime
1 Mickey Club house 0900 1100
1 Mickey Park 1100 1200
2 Donald Club house 0900 1000
2 Donald Park 1000 1200
3 Goofy Park 0900 1000
3 Goofy Club house 1000 1100
3 Goofy Park 1100 1200
What modifications do I need to the above query (Problem 1)?

Answer 1

Sounds like a case for analytic functions. You would need to add 1 hour to the EndTime, but that will be dependent on the data type.
SELECT EntityName, LocationID, StartTime, EndTime
FROM ( SELECT EntityName, LocationID
,MIN(Timex) OVER (PARTITION BY EntityID, delta ORDER BY delta) AS StartTime
,MAX(Timex) OVER (PARTITION BY EntityID, delta ORDER BY delta) AS EndTime
FROM locationreport2
) x
GROUP BY EntityName, LocationID, StartTime, EndTime
ORDER BY EntityName, StartTime