SQL group by days interval - mysql

Question

I have a sample table here with the following columns and sample records. I want to be able to sum my column cases using with a specific date range (the helper column).
I want to get my results this way:
Sum all cases WHERE date range is in between 2022-03-23 - 2022-04-01 and so on.
date range
Sum of Cases
2022-03-23-2022-04-01
5 (sample result only)
2022-03-24-2022-04-02
9 (sample result only)
The logic of the date range is always n - n9 days.
I 've tried this type of query but it does not work, it there a way for me to get this without have to use a query to create another column?
SELECT Date,
sum([QUERY 1]) as "Reports 7 days prev",
sum ([QUERY 2]) as "Reports 7 days after"
FROM REPORTS
GROUP BY Date
Data:
Date
BuyerID
Cases
Helper (Date Range)
4/1/2022
20001
2
2022-03-23-2022-04-01
4/1/2022
20001
1
2022-03-23-2022-04-01
4/2/2022
20002
3
2022-03-24-2022-04-02
4/5/2022
20003
5
2022-03-27-2022-04-05
4/7/2022
20004
6
2022-03-29-2022-04-07
4/7/2022
20005
9
2022-03-29-2022-04-07

Answer 1

Are you looking to get total cases for last X number of days? What does your initial data look like?
you can try something like:
Step 1: You aggregate all the cases for each date.
WITH CASES_AGG_BY_DATE AS
(
SELECT Date,
SUM(Cases) AS Total_Cases
FROM REPORTS
GROUP BY Date
),
Step 2: you aggregate the last 7 days rolling cases sum for each date
LAST_7_DAY_AGG AS
(
SELECT Date, SUM(Total_Cases) OVER(ORDER BY Date ASC ROWS BETWEEN 7 PRECEDING AND CURRENT ROW) AS sum_of_cases,
LAG(Date, 7) AS 7th_day
FROM CASES_AGG_BY_DATE
)
Step 3: create final output and concatenate date and 7th day before that
SELECT Date, CONCAT(Date, "-", 7th_day), sum_of_cases
FROM LAST_7_DAY_AGG;