Fork of LRN year counts by AntiCompositeNumber
This query is marked as a draft This query has been published by Bawolff.

SQL

AخA
 
USE commonswiki_p;
SELECT
  LEFT(
    ifnull(
      (
        SELECT
          MIN(oi_timestamp)
        from
          oldimage
        where
          oi_name = page_title
      ),
      img_timestamp
    ),
    4
  ) AS `year`,
  COUNT(*)
FROM
  `page`
  JOIN `image` on `page_title` = `img_name`
WHERE
  `page_id` IN (
    SELECT
      `cl_from`
    FROM
      `categorylinks`
    WHERE
      `cl_to` = "License_review_needed"
  )
GROUP BY
  1
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