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 
p1.page_title,
p1.page_id,
p1.page_namespace,
c1.cl_from,
c1.cl_to,
# As soon as I include one of the following fields,
# the query does not finish within 5 minutes,
# reason unclear.
#p2.page_title,
#p2.page_id,
#p2.page_namespace,
#c2.cl_from,
#c2.cl_to,
'Dummy'
FROM page p1
JOIN categorylinks c1
ON  c1.cl_from = p1.page_id
and c1.cl_to = 'Grundformeintrag_(Deutsch)'
join page p2
on  p2.page_namespace = 0
and p2.page_is_redirect = 0
#The following will make the query very slow (about 600 seconds):
#and p2.page_title in(concat(lower(left(p1.page_title,1)), mid(p1.page_title, 2, length(p1.page_title)-2)),
#                     concat(upper(left(p1.page_title,1)), mid(p1.page_title, 2, length(p1.page_title)-2)))
and p2.page_title = left(p1.page_title, length(p1.page_title)-1)
JOIN categorylinks c2
ON  c2.cl_from = p2.page_id
and c2.cl_to = 'Grundformeintrag_(Deutsch)'
where p1.page_namespace = 0
AND p1.page_is_redirect = 0
and length(p1.page_title) >= 3
#AND p1.page_title REGEXP '^[[:alpha:]]{3,}f$'
;
*/

/*
SELECT 
p1.page_title,
p1.page_id,
p1.page_namespace,
c1.cl_from,
c1.cl_to,
# As soon as I include one of the following fields,
# the query does not finish within 5 minutes,
# reason unclear.
#p2.page_title,
#p2.page_id,
#p2.page_namespace,
#c2.cl_from,
#c2.cl_to,
'Dummy'
FROM page p1
JOIN categorylinks c1
ON  c1.cl_from = p1.page_id
and c1.cl_to = 'Grundformeintrag_(Deutsch)'
and c1.cl_to not like 'Partizip_II_(Deutsch)%'
join page p2
on  p2.page_namespace = 0
and p2.page_is_redirect = 0
#The following will make the query very slow (about 600 seconds):
#and p2.page_title in(concat(lower(left(p1.page_title,1)), mid(p1.page_title, 2, length(p1.page_title)-2)),
#                     concat(upper(left(p1.page_title,1)), mid(p1.page_title, 2, length(p1.page_title)-2)))
and p2.page_title = concat(lower(left(p1.page_title, length(p1.page_title)-1)),"en")
JOIN categorylinks c2
ON  c2.cl_from = p2.page_id
and c2.cl_to = 'Verb_(Deutsch)'
where p1.page_namespace = 0
AND p1.page_is_redirect = 0
and p1.page_title not like '%.'
and p1.page_title not like '%-'
and p1.page_title not regexp '[aeiouäöüy]+[b-df-hj-np-tvwxz]+[aeiouäöüy]+' # einsilbig
#AND p1.page_title REGEXP '^[[:alpha:]]{3,}f$'
;
*/

SELECT 
p1.page_title,
p1.page_id,
p1.page_namespace,
c1.cl_from,
c1.cl_to,
# As soon as I include one of the following fields,
# the query does not finish within 5 minutes,
# reason unclear.
#p2.page_title,
#p2.page_id,
#p2.page_namespace,
#c2.cl_from,
#c2.cl_to,
'Dummy'
FROM page p1
JOIN categorylinks c1
ON  c1.cl_from = p1.page_id
and c1.cl_to = 'Grundformeintrag_(Deutsch)'
and c1.cl_to not like 'Partizip_II_(Deutsch)%'
join page p2
on  p2.page_namespace = 0
and p2.page_is_redirect = 0
#The following will make the query very slow (about 600 seconds):
#and p2.page_title in(concat(lower(left(p1.page_title,1)), mid(p1.page_title, 2, length(p1.page_title)-2)),
#                     concat(upper(left(p1.page_title,1)), mid(p1.page_title, 2, length(p1.page_title)-2)))
and p2.page_title = concat(lower(left(p1.page_title, length(p1.page_title)-1)),"n")
JOIN categorylinks c2
ON  c2.cl_from = p2.page_id
and c2.cl_to = 'Verb_(Deutsch)'
where p1.page_namespace = 0
AND p1.page_is_redirect = 0
and p1.page_title not like '%.'
and p1.page_title not like '%-'
and p1.page_title not like '%n'
and p1.page_title not like '%t'
#and p1.page_title not regexp '[aeiouäöüy]+[b-df-hj-np-tvwxz]+[aeiouäöüy]+' # einsilbig
#AND p1.page_title REGEXP '^[[:alpha:]]{3,}f$'
;

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