Cut Final Character

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

Grundformeintrag even when cutting final character (f in this case)
Why is this query slow when I include fields from p2 or c2?

SQL

USE dewiktionary_p;
SELECT CONCAT('# [[',p1.page_title,']]') AS page_title,
p1.page_id,
cl.cl_from,
cl.cl_to,
p2.page_title,
p2.page_namespace
FROM page p1
JOIN categorylinks cl
ON cl.cl_from = p1.page_id
LEFT JOIN page p2
ON cl.cl_to = p2.page_title 
# AND p2.page_namespace = 14
#LEFT JOIN page_props
#ON p2.page_id = pp_page AND pp_propname = 'hiddencat'
WHERE p1.page_namespace = '(main)'
AND p1.page_is_redirect = 0
AND p1.page_title REGEXP '^Haus$';

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