Ratio of deleted images per month (huwiki)

Fork of Share of deleted images uploaded by non-autoconfirmed users per month (huwiki) by Tgr

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

SQL

use huwiki_p;

SELECT CONCAT(substr(kept.month, 1, 4), '-', substr(kept.month, 1, 4)) month, kept.count + deleted.count total, deleted.count / (kept.count + deleted.count) deleted_ratio FROM (
	SELECT
	  substr(img_timestamp, 1, 6) month,
	  COUNT(*) count
  	FROM image
  	GROUP BY month
) kept JOIN (
	SELECT
	  substr(fa_timestamp, 1, 6) month,
	  COUNT(*) count
  	FROM filearchive
  	GROUP BY month
) deleted ON kept.month = deleted.month
ORDER BY month
;

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