Commons file pages linked from a page - fast again

Fork of Commons file pages linked from a page - very slow with extra join by Jheald

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

Joining the page table requires page-namespace as well as page-title to be specified, for join to be fast using multi-column index

SQL

use commonswiki_p;

SELECT DISTINCT fp.page_title #, GROUP_CONCAT(cl.cl_to SEPARATOR ' / ') AS cats

FROM page AS p0
JOIN pagelinks AS pl ON pl.pl_from=p0.page_id AND pl.pl_from_namespace=p0.page_namespace AND pl.pl_namespace=6
JOIN page AS fp ON fp.page_namespace = pl.pl_namespace AND fp.page_title = pl.pl_title
# JOIN categorylinks AS cl ON cl.cl_from = fp.page_id

WHERE p0.page_title='British_Library/MC_maps_batch_01_(GB_counties)' AND p0.page_namespace=4

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