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GregorB
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use enwiki_p; # 20200101: 15245/325.0 # 20210101: 15736/291.0 # 20200110: 15745/285.3 # 20200120: 15756/277.8 # 20200128: 15764/273.3 select count(*), round(avg(age), 1) as avg_age from ( select pa.page_id, str_to_date(max(r.rev_timestamp), '%Y%m%d') as ts, datediff(date '20200101', str_to_date(max(r.rev_timestamp), '%Y%m%d')) - 1 as age from page pa inner join revision r on r.rev_page = pa.page_id where pa.page_namespace = 0 and pa.page_is_redirect = 0 and pa.page_title in ( select pt.page_title from page pt inner join categorylinks cl on cl.cl_from = pt.page_id where pt.page_namespace = 1 and cl.cl_to = "WikiProject_Croatia_articles" ) and r.rev_timestamp < '20200101' group by pa.page_id ) t
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