Non-existant categories only used in one non-article page

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SQL

use fawiki_p;
select cl_to, count(cl_from) as cnt
from categorylinks
left join page pto
on pto.page_title = cl_to
and pto.page_namespace=14
join page pfrom
on pfrom.page_id = cl_from
where pto.page_id is null
and pfrom.page_namespace <> 0
group by cl_to
having cnt = 1;

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SQL

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