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 posts.OwnerUserId DESC) AS IndexColumn,
    posts.OwnerUserId,
    FORMAT(posts.CreationDate, 'yyyy-MM-dd') AS CreationDate,
    avg(len(body)) AS  length
FROM posts 
INNER JOIN TempTable ON posts.OwnerUserId = TempTable.OwnerUserId
WHERE PostTypeId=1 AND posts.CreationDate BETWEEN '2020-09-06' AND '2021-02-28'
GROUP BY posts.OwnerUserId, FORMAT(posts.CreationDate, 'yyyy-MM-dd'),len(body)
)
Select *
From FINAL
where IndexColumn > 249999 
order by IndexColumn

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