SQL
x
use cswikisource_p;
select avg(length(rev_comment)) as avglen, count(rev_comment) as summaries, user_name from revision join user on rev_user = user_id where user_name in ('Blahma', 'Martin Urbanec', 'Limojoe', 'Frettie', 'Bazi', 'Muselsom', 'Martin Kotačka', 'Dominikmatus', 'Nesnera', 'Harold', 'Ben Skála', 'BíláVrána', 'Jirr', 'DavidSchuller', 'Horst', 'Mormegil', 'Zirland', 'Skim') group by rev_user order by avglen desc;
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