WITH TempTable AS ( SELECT OwnerUserId, COUNT(CASE WHEN C...

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WITH TempTable AS (
    SELECT 
        OwnerUserId,
        COUNT(CASE WHEN CreationDate BETWEEN '2020-09-06' AND '2020-11-29' THEN Id ELSE NULL END) AS CountPeriodA,
        COUNT(CASE WHEN CreationDate BETWEEN '2020-12-06' AND '2021-02-28' THEN Id ELSE NULL END) AS CountPeriodB
    FROM posts
    WHERE PostTypeId = 1
    GROUP BY OwnerUserId
    HAVING 
        COUNT(CASE WHEN CreationDate BETWEEN '2020-09-06' AND '2020-11-29' THEN Id ELSE NULL END) >= 1
        AND 
        COUNT(CASE WHEN CreationDate BETWEEN '2020-12-06' AND '2021-02-28' THEN Id ELSE NULL END) >= 1
),
FINAL AS (
    SELECT 
        ROW_NUMBER() OVER (ORDER BY posthistory.UserId DESC) AS IndexColumn,
        posthistory.UserId,
        FORMAT(posthistory.CreationDate, 'yyyy-MM-dd') AS CreationDate,
        Count(posthistory.UserId) AS engagement       
    FROM Posthistory
    INNER JOIN TempTable ON posthistory.UserId = TempTable.OwnerUserId
    WHERE posthistory.CreationDate BETWEEN '2020-09-06' AND '2021-02-28'
    GROUP BY posthistory.UserId, FORMAT(posthistory.CreationDate, 'yyyy-MM-dd')
)
SELECT * FROM FINAL

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