SQL
x
USE fawiki_p;
# child and parent category in an article
SELECT page_title title, chld.cl_to child_category, prnt.cl_to parent_category
FROM categorylinks AS chld JOIN page ON chld.cl_from = page_id AND page_namespace = 0 AND page_is_redirect = 0
JOIN categorylinks AS prnt ON prnt.cl_from = page_id
# none is hidden
WHERE NOT EXISTS (
SELECT NULL
FROM page JOIN page_props ON page_id = pp_page
WHERE page_namespace = 14
AND page_is_redirect = 0
AND (
page_title = chld.cl_to
OR page_title = prnt.cl_to
)
AND pp_propname = 'hiddencat'
)
# prnt is parent of chld
AND prnt.cl_to IN (
SELECT cl_to
FROM categorylinks JOIN page ON cl_from = page_id
WHERE page_title = chld.cl_to
AND page_namespace = 14
AND page_is_redirect = 0
)
AND prnt.cl_to <> 'صفحه•های_ابهام•زدایی'
ORDER BY prnt.cl_to
LIMIT 100;
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