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Q&A for experienced flyers, pilots, and builders of drones and model aircraft

WITH YearlyTagCounts AS (
    SELECT TOP 5
        t.TagName
    FROM Posts pl,
         PostTags pt,
         Tags t
    WHERE pl.id = pt.PostId
    AND pt.TagId = t.Id
    AND pl.CreationDate >= DATEADD(YEAR, DATEDIFF(YEAR, 0, GETDATE()), 0)
    AND pl.CreationDate < DATEADD(YEAR, DATEDIFF(YEAR, 0, GETDATE()) + 1, 0)
    and pl.Id >= 77734096
    GROUP BY t.TagName
    ORDER BY COUNT(pl.id) DESC
),
DailyTagPosts AS (
    SELECT
        CAST(pl.CreationDate AS DATE) AS CDate,
        t.TagName,
        COUNT(pl.id) AS DailyPostCount
    FROM Posts pl,
         PostTags pt,
         Tags t,
         YearlyTagCounts ytc
    WHERE pl.id = pt.PostId
    AND pt.TagId = t.Id
    AND t.TagName = ytc.TagName
    AND pl.CreationDate >= DATEADD(YEAR, DATEDIFF(YEAR, 0, GETDATE()), 0)
    AND pl.CreationDate < DATEADD(YEAR, DATEDIFF(YEAR, 0, GETDATE()) + 1, 0)
    and pl.Id >= 77734096
    GROUP BY CAST(pl.CreationDate AS DATE), t.TagName
),
CumulativeTagPosts AS (
    SELECT
        CDate,
        TagName,
        SUM(DailyPostCount) OVER (PARTITION BY TagName ORDER BY CDate ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS CumulativePosts
    FROM DailyTagPosts
)
SELECT
    CDate,
    TagName AS Theme,
    CumulativePosts AS CumulativeNumberOfPosts
FROM CumulativeTagPosts
ORDER BY TagName, CDate;

view current version

edited nov 8

created nov 8 Janis123