Userspace links in articles

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

SELECT pl_from, NS, page_title/*, L_NS*/, L_titles, num_L as '#L', SB, IU, CSD, SR
FROM (
SELECT
  pl_from,
  -- pl_from_namespace does not appear to be consistently reliable;
  -- it might be better to select from the page table and join the pagelinks table to it.
  CASE
    -- This fails on pages missing from the page table (presumably because they were deleted).
    WHEN pl_from_namespace != page_namespace THEN CONCAT(pl_from_namespace, ' vs. ', page_namespace)
    ELSE pl_from_namespace
  END AS NS,
  page_title,
  pl_namespace AS L_NS,
  GROUP_CONCAT(pl_title SEPARATOR ' ') AS L_titles,
  COUNT(pl_title) AS num_L,
  CASE
    WHEN MAX(CASE WHEN pl_title LIKE '%/sandbox' THEN 1 END) = 1 THEN '(SB)'
    ELSE ''
  END AS SB,
  CASE
    WHEN EXISTS (
      SELECT 1
      FROM templatelinks
      WHERE
        tl_from = pl_from
        AND tl_title = 'Under_construction'
    ) THEN '(UC)'
    WHEN EXISTS (
      SELECT 1
      FROM templatelinks
      WHERE
        tl_from = pl_from
        AND tl_title = 'In_use'
    ) THEN '(IU)'
    WHEN EXISTS (
      SELECT 1
      FROM templatelinks
      WHERE
        tl_from = pl_from
        AND tl_title = 'GOCEinuse'
    ) THEN '(CE)'
    WHEN EXISTS (
      SELECT 1
      FROM templatelinks
      WHERE
        tl_from = pl_from
        AND tl_title = 'In_creation'
    ) THEN '(IC)'
    WHEN EXISTS (
      SELECT 1
      FROM templatelinks
      WHERE
        tl_from = pl_from
        AND tl_title = 'Copyvio-revdel'
    ) THEN '(RD1)'
    WHEN EXISTS (
      SELECT 1
      FROM templatelinks
      WHERE
        tl_from = pl_from
        AND tl_title = 'History_merge'
    ) THEN '(HM)'
  END AS IU,
  CASE
    WHEN EXISTS (
      SELECT 1
      FROM templatelinks
      WHERE
        tl_from = pl_from
        AND tl_title = 'Wikipedia_person_user_link'
    )
    OR page_title LIKE '%Wiki%'
    OR page_title = 'The_Signpost' THEN '(WP)'
    ELSE ''
  END AS WP,
  CASE
    WHEN EXISTS (
      SELECT 1
      FROM templatelinks
      WHERE
        tl_from = pl_from
        AND tl_title = 'Self-reference_link'
    ) THEN '(SR)'
    ELSE ''
  END AS SR,
  CASE
    WHEN EXISTS (
      SELECT 1
      FROM categorylinks
      WHERE
        cl_from = pl_from
        AND cl_to = 'Candidates_for_speedy_deletion'
    ) THEN '(CSD)'
    WHEN EXISTS (
      SELECT 1
      FROM templatelinks
      WHERE
        tl_from = pl_from
        AND tl_title IN ('AFC_submission', 'Afc_comment')
    ) THEN '(AfC)'
    WHEN EXISTS (
      SELECT 1
      FROM categorylinks
      WHERE
        cl_from = pl_from
        AND cl_to = 'All_articles_proposed_for_deletion'
    ) THEN '(PROD)'
    ELSE ''
  END AS CSD
  -- Could handle PROD through the category 'All_articles_proposed_for_deletion'
  -- But that template doesn't list the last edit; maybe it should.
FROM pagelinks
LEFT JOIN page ON page_id = pl_from
WHERE
  pl_from_namespace = 0
  AND pl_namespace = 2
  -- In the future: AND pl_namespace != 0
GROUP BY pl_from
ORDER BY SB, page_title
) AS t1
WHERE
  (CSD = '' OR CSD='(AfC)' OR CSD='(PROD)') -- There's no need for me to review every CSD. Or any CSD.
  -- AND (IU = '' OR IU = '(IC)') -- I don't need to see every article that's being copy-edited.
  -- AND (C_PB = '' OR num_L > 2) - Now accomplished by IU - was using 'Pages_using_Under_construction_with_the_placedby_parameter'
  AND (
    (WP = '')
    OR num_L > 1 
  )
  AND page_title != 'Main_Page' -- Is a special mainspace page: it shouldn't be treated like others and isn't useful to report on.
  AND WP != '(WP)' -- I will handle these separately; they usually require more attention to all types of cross-namespace links.
  AND page_title NOT IN (
    'Collapse_(medical)',
    'David_Ferriero',
    'Dirty_Politics',
    'Fermi_paradox',
    'The_hand_of_God'
  ) -- I'll deal with these later; I'm not currently sure of the best way to handle them.
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