Counting rows sql server

Question

I have a problem with counting rows. This is my procedure :

DECLARE @result table(id int,latitude float, longitude float)
Declare @z int = 1
while (@z <5) 
BEGIN
INSERT INTO
@result
SELECT 
id,
loc.STPointN(@z).Lat as lat,
loc.STPointN(@z).Long as long
FROM test6
SET @z = @z+1
END
Select * from @result
ORDER BY id

Results:

ID  lat         long
1   16,71175    52,689702
1   17,008381   52,247983
2   17,228107   52,689702
2   17,008381   42,247983
2   16,71175    42,689702

I want to count rows with same ID, somthing like :

ID  lat         long       count
1   16,71175    52,689702  1
1   17,008381   52,247983  2
2   17,228107   52,689702  1
2   17,008381   42,247983  2
2   16,71175    42,689702  3

Any advice ? (Sorry for english)

Answer 1

You need to apply RowNumber window function like below

select
id,
lat,
long,
row_number() over(partition by id order by id) as countt
from 
yourtable

In the above code countt per id you get is not deterministic,if you want specific id column to have same countt,you need to order by unique value like

 row_number() over(partition by id order by lat) as countt