SQL
AخA
USE enwiki_p;
SELECT year_created, COUNT(*) FROM (
SELECT MIN(rev_timestamp), SUBSTR(rev_timestamp, 1, 4) AS year_created
FROM page
INNER JOIN revision ON rev_page = page_id
WHERE
page_namespace = 10
AND page_title LIKE "%/meta/color"
GROUP BY page_id
) AS subtable1
GROUP BY year_created
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