Average, minimum, maximum edit size per user (failure)

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

SQL

use enwiktionary_p;

select
	actor_name as user,
    avg(rev_len - (select rev_len from revision where rev_id = revision_userindex.parent_rev_id)) as 'average revision length',
    max(rev_len - (select rev_len from revision where rev_id = revision_userindex.parent_rev_id)) as 'maximum revision length'
from revision_userindex
join actor on actor_id = rev_actor
group by rev_actor
order by avg(rev_len)
limit 200;

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