Average, maximum, minimum edit size (not page creation) per user

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SQL

select
	actor_name as user,
    avg(diff) as average,
    max(diff) as maximum,
    min(diff) as minimum,
    count(*) as count
from (select
        cast(after.rev_len as signed) - cast(before.rev_len as signed) as diff,
        actor_name
      from revision as after
      join revision as `before`
      on before.rev_id = after.rev_parent_id
      join actor on actor_id = after.rev_actor
      order by after.rev_timestamp desc
      limit 1000000) as diffs
group by actor_name
having count >= 300 -- edit count
order by average desc;

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