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

    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

FROM pagelinks

LEFT JOIN page ON page_id = pl_from

WHERE

  pl_namespace = 0

  AND pl_from_namespace = 0

  AND pl_title RLIKE '[0-9]{4}\_in\_video\_games'

  -- AND pl_title RLIKE '[0-9]{4}_in_video_games'

-- GROUP BY pl_from

-- ORDER BY page_title

-- LIMIT 10