Main-namespace redirects

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

How many redirects in the English Wikipedia point to pages in the main namespace? How many of them point to a redirect?

SQL

USE enwiki_p;

SELECT count(*) AS total_main_redirects
FROM page
JOIN redirect
ON page_id=rd_from
WHERE rd_namespace=0
AND page_namespace=0;

SELECT count(*) AS num_target_redirects
FROM page ps
JOIN redirect
ON page_id=rd_from
JOIN page pt
ON (rd_namespace=pt.page_namespace
    AND rd_title=pt.page_title)
WHERE ps.page_namespace=0
AND rd_namespace=0
AND pt.page_is_redirect=1;

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