misuse of user pages

SQL

USE enwiki_p;
SELECT CONCAT('# [[User:', page_title, ']]') AS page_title, page_len, rev_user_text, user_editcount
FROM page, revision, user
WHERE page.page_id = revision.rev_page
and page_title in (select pl_title from pagelinks where pl_from = 43401631)
#and page_len > 3000
and revision.rev_user = user.user_id
AND page_namespace = 2 #and page_title not like "%/%"
AND rev_parent_id = 0
and user_editcount < 51
#and page_id in (select el_from from externallinks)
and rev_user in (select ipb_user from ipblocks)
and page_id not in (select distinct cl_from from categorylinks where cl_to like "Wikipedia_sockpuppets%")
and REPLACE(page_title, '_', ' ') in (select user_name from user where user_editcount < 51)
ORDER BY page_len desc
SQL

Checking query status...
