Average score of a first question (per day, between dates)

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Mathematics

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;with firstpostids_cte as (
SELECT MIN(Id) AS MinId, OwnerUserId
FROM Posts
WHERE PostTypeId=1
GROUP BY OwnerUserId, OwnerDisplayName
)
, firstpostsscore_cte as (
SELECT
p.Id, p.CreationDate AS cre, p.Score AS sco
FROM firstpostids_cte fp JOIN Posts p ON fp.MinId=p.Id
)

SELECT 
CAST(cre AS date), AVG(cast(sco as decimal))
FROM firstpostsscore_cte
WHERE cre >= '##Date1##' AND cre <= '##Date2##'
GROUP BY CAST(cre AS date)
ORDER BY CAST(cre AS date)

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