Explaining that page_id changes depending on the namspace

Fork of Retrieve all articles in WikiProject_COVID-19_articles by Mjhbest

This query is marked as a draft This query has been published by Diego (WMF).

SQL

SELECT  article.page_title, article.page_id as page_id_namespace_0, page.page_id as page_id_namespace_1
FROM page
INNER JOIN page article
ON page.page_title=article.page_title
INNER JOIN categorylinks  ON   cl_from = page.page_id
AND   categorylinks.cl_to = "WikiProject_COVID-19_articles"
WHERE page.page_namespace = 1 
AND article.page_namespace = 0

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