Ruwiki articles with non-existing or redirected categories

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

SQL

use ruwiki_p;
select count(*) from categorylinks
where exists
(select * from page
 where page_id = cl_from
 and page_namespace = 0)
and not exists
(select * from page
 where page_title = cl_to
 and page_namespace = 14
 and not page_is_redirect)

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SQL

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