Untitled query #78622

This query is marked as a draft This query has been published by لوقا.

SQL

SELECT YEAR(creation_date) AS creation_year, COUNT(*) AS category_count
FROM (
    SELECT page_id, MIN(rev_timestamp) AS creation_date
    FROM page
    JOIN revision ON page_id = rev_page
    WHERE page_namespace = 14 -- Category namespace
    GROUP BY page_id
) AS first_revisions
GROUP BY creation_year
ORDER BY creation_year;

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