Non-dead people on Czech Wikipedia since year 1500

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

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SELECT cat_title, @count_all := (SELECT COUNT(DISTINCT cl_from) FROM categorylinks WHERE cl_to = cat_title) AS count_all, @count_dead := (SELECT COUNT(DISTINCT cl_from) FROM categorylinks WHERE cl_from IN (SELECT cl_from FROM categorylinks WHERE cl_to = cat_title) AND cl_to REGEXP '^Úmrtí_[0-9][0-9][0-9][0-9]$') AS count_dead, (@count_dead / @count_all) AS ratio FROM category WHERE cat_title REGEXP '^Narození_(1[5-9]..|20..)$' ORDER BY cat_title

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