Query Help for Running Count

Question

hi i have table with data like below
CREATE TABLE Table1
ID int
,GroupID int
insert into Table1 values(1,1)
insert into Table1 values(2,2)
insert into Table1 values(3,2)
insert into Table1 values(4,1)
insert into Table1 values(5,1)
insert into Table1 values(6,3)
insert into Table1 values(7,3)
insert into Table1 values(7,3)
insert into Table1 values(8,2)
insert into Table1 values(9,4)
insert into Table1 values(10,5)
Here i need the out put with GroupID and the count. The expected output like below
GroupID
Count
1
1
2
2
1
1
3
3
2
1
4
1
             5              1  
I think you got my scenario. For each groupID i need to put the count but with adjusents same GroupID

Answer 1

Hi Akhil,
It looks like your expected is wrong, Try the below:
CREATE TABLE Table1
ID int
,GroupID int
insert into Table1 values(1,1)
insert into Table1 values(2,2)
insert into Table1 values(3,2)
insert into Table1 values(4,1)
insert into Table1 values(5,1)
insert into Table1 values(6,3)
insert into Table1 values(7,3)
insert into Table1 values(7,3)
insert into Table1 values(8,2)
insert into Table1 values(9,4)
insert into Table1 values(10,5)
;WITH FirstCte AS (
SELECT GroupID,id,
ROW_NUMBER() OVER(ORDER BY id) AS rnComplete,
ROW_NUMBER() OVER(PARTITION BY GroupID ORDER BY id) AS rnGroupID
FROM Table1)
, SecondCte AS (
SELECT id,GroupID, count(GroupID) Over(partition by GroupID, rnComplete - rnGroupID) as GroupCnt
FROM FirstCte )
SELECT m.GroupID, GroupCnt
FROM SecondCte AS m
GROUP BY m.GroupID, GroupCnt
Order by MAX(m.ID)
Drop table Table1
GroupID
Count
1
1
2
2
1
2
3
3
2
1
4
1
             5              1