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

SQL

AخA
 
use fawiki_p;
select rev_user_text, rev_year, sum(rev_id)
from
(
select
  new.rev_id,
  substr(rev_timestamp, 1, 4) rev_year,
  new.rev_user_text,
  case
    when new.rev_len > old.rev_len then new.rev_len - old.rev_len
    else null
  end expansion
from revision new
join revision old
  on old.rev_id = new.rev_parent_id
join page
  on new.rev_page = page_id
where
  page_namespace = 0
  and new.rev_user_text = 'Huji'
) exp
group by rev_user_text, rev_year
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