zhwiki: broken redirect (CSD G15) - Quarry

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SQL

SELECT rd_from, page_namespace, page_title, rd_namespace, rd_title
FROM (
  SELECT rd_from, rd_namespace, rd_title
  FROM redirect
  LEFT JOIN page ON rd_namespace = page_namespace AND rd_title = page_title
  #WHERE page_namespace IS NULL
) AS r
LEFT JOIN page ON rd_from = page_id
WHERE page_namespace NOT IN (2, 3)

AخA
 
SELECT rd_from, page_namespace, page_title, rd_namespace, rd_titleFROM (  SELECT rd_from, rd_namespace, rd_title  FROM redirect  LEFT JOIN page ON rd_namespace = page_namespace AND rd_title = page_title  #WHERE page_namespace IS NULL) AS rLEFT JOIN page ON rd_from = page_idWHERE page_namespace NOT IN (2, 3)

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