Update column with 4 consecutive purchases - sql-server

Question

I need to update my Result column values for the entire user to yes if the user did make 4 consecutive purchases without receiving a bonus in between. How can this be done. Please see my code below.....
-- drop table #Test
CREATE TABLE #Test (UserID int, TheType VARCHAR(10), TheDate DATETIME, Result VARCHAR(10))
INSERT INTO #Test
SELECT 1234, 'Bonus', GETDATE(), NULL
UNION
SELECT 1234, 'Purchase', GETDATE()-1, NULL
UNION
SELECT 1234, 'Purchase', GETDATE()-2, NULL
UNION
SELECT 1234, 'Purchase', GETDATE()-3, NULL
UNION
SELECT 1234, 'Purchase', GETDATE()-4, NULL
UNION
SELECT 1234, 'Bonus', GETDATE()-5, NULL
UNION
SELECT 1234, 'Purchase', GETDATE()-6, NULL
UNION
SELECT 1234, 'Bonus', GETDATE()-7, NULL
SELECT * FROM #Test ORDER BY TheDate
Again, please note that the purchases need to be consecutive (By TheDate)

Answer 1

You can as the below:
;WITH CTE1
AS
(
SELECT
ROW_NUMBER() OVER (ORDER BY TheDate) RowId,
ROW_NUMBER() OVER (PARTITION BY UserID,TheType ORDER BY TheDate) PurchaseRowId,
*
FROM #Test
), CTE2
AS
(
SELECT
MIN(A.RowId) MinId,
MAX(A.RowId) MaxId
FROM
CTE1 A
GROUP BY
A.TheType,
A.RowId - A.PurchaseRowId
)
SELECT
A.UserID ,
A.TheType ,
A.TheDate ,
CASE WHEN B.MinId IS NULL THEN NULL ELSE 'YES' END Result
FROM
CTE1 A LEFT JOIN
CTE2 B ON A.RowId >= B.MinId AND A.RowId <= B.MaxId AND (B.MaxId - B.MinId) > 2
--AND A.TheType = 'Purchase'
ORDER BY A.TheDate
Result:
UserID TheType TheDate Result
----------- ---------- ----------------------- - ------
1234 Bonus 2017-06-06 11:06:03.130 NULL
1234 Purchase 2017-06-07 11:06:03.130 NULL
1234 Bonus 2017-06-08 11:06:03.130 NULL
1234 Purchase 2017-06-09 11:06:03.130 YES
1234 Purchase 2017-06-10 11:06:03.130 YES
1234 Purchase 2017-06-11 11:06:03.130 YES
1234 Purchase 2017-06-12 11:06:03.130 YES
1234 Bonus 2017-06-13 11:06:03.130 NULL

Answer 2

First you have to derive the column group and then group by that (having = 4) and inner join with the original table.
drop table if exists #Test;
create table #Test
(
UserID int
, TheType varchar(10)
, TheDate date
, Result varchar(10)
);
insert into #Test
select 1234, 'Bonus', getdate(), null
union
select 1234, 'Purchase', getdate() - 1, null
union
select 1234, 'Purchase', getdate() - 2, null
union
select 1234, 'Purchase', getdate() - 3, null
union
select 1234, 'Purchase', getdate() - 4, null
union
select 1234, 'Bonus', getdate() - 5, null
union
select 1234, 'Purchase', getdate() - 6, null
union
select 1234, 'Bonus', getdate() - 7, null;
drop table if exists #temp;
select
*
, lag(t.TheDate, 1) over ( order by t.TheDate ) as Lag01
, lag(t.TheType, 1) over ( order by t.TheDate ) as LagType
into
#temp
from #Test t;
with cteHierarchy
as
(
select
UserID
, TheType
, TheDate
, Result
, Lag01
, t.TheDate as Root
from #temp t
where t.LagType <> t.TheType
union all
select
t.UserID
, t.TheType
, t.TheDate
, t.Result
, t.Lag01
, cte.Root as Root
from #temp t
inner join cteHierarchy cte on t.Lag01 = cte.TheDate
and t.TheType = cte.TheType
)
update test
set
Result = 4
from (
select
t.Root
, count(t.UserID) as Cnt
, t.UserID
from cteHierarchy t
group by t.UserID, t.Root
having count(t.UserID) = 4
) tt
inner join #Test test on tt.UserID = test.UserID
select * from #Test t
order by t.TheDate;