writing a query and giving a score - sql-server

Question

I am trying to write a query for the following:
Count the number of transactions in the previous 90 days. Note: This needs to
be averaged out for new members = (No of transactions / Days being a
member) x 90
New members are the one whose DateCreated is between 0 and 90 days from todays date.
Table structure:
Column Name Datatype
---------------------------------
Member_No nvarchar(255)
Order_No int
Transaction_Date datetime
Net money
Date_Created datetime
Also, the final step is after counting the transactions, I need to give a score. So if a member has count more than 8 then give a score of 5.
Following are the ranges:`
Transaction count Score
>8 5
6-8 4
4-6 3
2-4 2
0-2 1
Let me know if any queries

Answer 1

Hope the below code works for you (Not tested because not having Schema.)
;WITH RANKS AS
(
SELECT 0 AS FROM_TR, 2 AS TO_TR, 1 AS SCORE
UNION ALL
SELECT 3 AS FROM_TR, 4 AS TO_TR, 2 AS SCORE
UNION ALL
SELECT 5 AS FROM_TR, 6 AS TO_TR, 3 AS SCORE
UNION ALL
SELECT 7 AS FROM_TR, 8 AS TO_TR, 4 AS SCORE
UNION ALL
SELECT 9 AS FROM_TR, NULL AS TO_TR, 5 AS SCORE
)
, MEMBER_TRANS AS (
SELECT Member_No AS MEMBER_NO
,Date_Created AS DATE_CREATED
,COUNT(DISTINCT Order_No) ACTUAL_TRANSACT_COUNT
,CASE
WHEN Date_Created BETWEEN DATEADD(DD, - 90, GETDATE())
AND GETDATE()
THEN CAST(
COUNT(DISTINCT Order_No) / DATEDIFF(DD, Date_Created, GETDATE()) * 90
AS INT)
ELSE COUNT(DISTINCT Order_No)
END AS TRANSACT_COUNT
FROM TABLE1
WHERE Transaction_Date BETWEEN DATEADD(DD, - 90, GETDATE())
AND GETDATE()
GROUP BY Member_No
,Date_Created
)
SELECT MT.Member_No,MT.TRANSACT_COUNT, R.SCORE FROM MEMBER_TRANS MT
INNER JOIN RANKS R ON MT.TRANSACT_COUNT BETWEEN R.FROM_TR
AND isnull(R.TO_TR,MT.TRANSACT_COUNT)
--Added Extra below code from your comments
UNION ALL
SELECT Member_No,COUNT(DISTINCT Order_No), 1 AS SCORE FROM TABLE1
WHERE Transaction_Date < DATEADD(DD, - 90, GETDATE())
AND Transaction_Date NOT BETWEEN DATEADD(DD, - 90, GETDATE())
AND GETDATE()
GROUP BY Member_No

Answer 2

The code will return the desired result as per your requirement.Please find the snapshot of output for below query.
WITH Mycte
AS
(
Select Member_No,Case when DateDiff(dd,Date_Created,Getdate())>90 then 0 else 1 END AS New_Member
, DateDiff(dd,Date_Created,Getdate()) AS DaysAsMember
,Count(Order_No) TransactionCount from #Sample1
group by Member_No,Date_Created
)
Select Member_No,Case when TransactionCount > 8 THEN 5
WHEN TransactionCount BETWEEN 6 AND 8 THEN 4
WHEN TransactionCount BETWEEN 4 AND 5 THEN 3
WHEN TransactionCount BETWEEN 3 AND 4 THEN 2
WHEN TransactionCount BETWEEN 0 AND 2 THEN 1
END
AS Score
From Mycte