Empty dated categories

This query is marked as a draft This query has been published by DannyS712.

SQL

USE enwikinews_p;
SELECT cl3.* FROM categorylinks cl3
WHERE cl_to IN (
SELECT
  pg.page_title
FROM
  categorylinks cl
  JOIN page pg ON pg.page_id = cl.cl_from
WHERE
  cl.cl_to IN (
    SELECT
      pg2.page_title
    FROM
      categorylinks cl2
      JOIN page pg2 ON pg2.page_id = cl2.cl_from
    WHERE
      cl2.cl_to LIKE '2016'
      AND cl2.cl_type = 'subcat'
      AND cl2.cl_sortkey_prefix like '__'
  )
)
GROUP BY cl_to

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