Czech Wikipedians by total bytes added - Quarry

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SQL

SELECT actor_name, SUM(GREATEST(0, CAST(r1.rev_len AS SIGNED)-COALESCE(CAST(r2.rev_len AS SIGNED), 0))) AS bytes FROM revision AS r1 JOIN page ON rev_page = page_id AND page_namespace = 0 LEFT JOIN revision AS r2 ON r1.rev_parent_id = r2.rev_id JOIN actor ON r1.rev_actor = actor_id GROUP BY actor_name ORDER BY bytes DESC

AخA
 
SELECT actor_name, SUM(GREATEST(0, CAST(r1.rev_len AS SIGNED)-COALESCE(CAST(r2.rev_len AS SIGNED), 0))) AS bytes FROM revision AS r1 JOIN page ON rev_page = page_id AND page_namespace = 0 LEFT JOIN revision AS r2 ON r1.rev_parent_id = r2.rev_id JOIN actor ON r1.rev_actor = actor_id GROUP BY actor_name ORDER BY bytes DESC

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