Статті Haida з сумою дифів інших

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SELECT p.page_id, p.page_title,
(select 
 sum(case when rr.rev_actor = r.rev_actor then 0 else abs(rr.rev_len - (select rrr.rev_len from revision rrr where rrr.rev_id = rr.rev_parent_id)) end) as haidaless_sum
 from revision rr where rr.rev_page = r.rev_page group by rev_page) as haidaless_sum
FROM page p
JOIN revision r ON p.page_id = r.rev_page
JOIN actor a ON r.rev_actor = a.actor_id
WHERE p.page_namespace = 0 AND a.actor_name = "Haida" AND r.rev_parent_id = 0 AND p.page_is_redirect = 0;

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