Userspace links in articles

SQL

-- See [[Special:Diff/904016069]]
SELECT *
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,
  COUNT(pl_title) AS num_L,
  pl_namespace AS 'L NS',
  GROUP_CONCAT(pl_title SEPARATOR ' ') AS 'L titles',
  CASE
    WHEN EXISTS(
      SELECT 1
      FROM templatelinks
      WHERE
        tl_from = pl_from
        AND tl_title = 'Under_construction'
    ) THEN '(C)'
  END AS C
FROM pagelinks
LEFT JOIN page ON page_id = pl_from
WHERE
  pl_from_namespace = 0
  AND pl_namespace = 2
  -- AND pl_namespace != 0
GROUP BY pl_from -- An unfortunate necessity to avoid excessive templatelinks rows
ORDER BY page_title
) AS t1
WHERE NOT (num_L = 1 AND C = '(C)')
SQL

Checking query status...
