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