nlwiki File uploads and deletions by year

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

Combines *new* uploads from `image` and `filearchive` and shows next to deletions in `filearchive`.
Table `logging` doesn't have any info from before 2006.
Deletions before 2006 were not recorded anywhere it seems.

SQL

(SELECT LEFT(log_timestamp, 4) AS `year`, COUNT(*) AS `uploads`, NULL AS `deletions`
FROM logging
WHERE log_namespace=6 AND log_type='upload' AND log_action='upload'
GROUP BY `year`
UNION
SELECT LEFT(log_timestamp, 4) AS `year`,  NULL AS `uploads`, COUNT(*) AS `deletions`
FROM logging
WHERE log_namespace=6 AND log_type='delete' AND log_action='delete'
GROUP BY `year`)
GROUP BY `year`

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