Portal subpages with existing base page

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

Portal subpages (with at least one non-deleted revision) whose base page exists.

For [[Wikipedia talk:WikiProject Portals#Identifying old-style portals]] circa 11 April 2019.

SQL

SELECT
    CONCAT('[[Portal:', basepage.page_title, ']]') AS 'basepage',
    CONCAT('[[Portal:', subpage.page_title, ']]') AS 'subpage'
FROM page subpage
JOIN page basepage
    ON basepage.page_namespace = 100
    AND basepage.page_title = REGEXP_REPLACE(subpage.page_title, '/.*', '')
WHERE subpage.page_namespace = 100
    AND subpage.page_title LIKE '%/%';

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SQL

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