Revert statistics in Czech Wikipedia

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

SQL

USE cswiki_p;
SELECT LEFT(rev_timestamp, 6), COUNT(*)
FROM tag_summary
JOIN revision ON rev_id = ts_rev_id
WHERE ts_rev_id IS NOT NULL
AND (ts_tags LIKE '%mw-rollback%' OR ts_tags LIKE '%mw-undo%')
WHERE rev_timestamp >= 20180000000000
GROUP BY LEFT(rev_timestamp, 6);

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