SELECT

    #source.page_title AS title_source,

    #cl.cl_to AS prio_source

    target.page_title AS title_target,

    SUM(CASE WHEN cl.cl_to = 'Top-priority_mathematics_articles' THEN 1 ELSE 0 END) AS count_top,

    SUM(CASE WHEN cl.cl_to = 'High-priority_mathematics_articles' THEN 1 ELSE 0 END) AS count_high,

    SUM(CASE WHEN cl.cl_to = 'Mid-priority_mathematics_articles' THEN 1 ELSE 0 END) AS count_mid,

    SUM(CASE WHEN cl.cl_to = 'Low-priority_mathematics_articles' THEN 1 ELSE 0 END) AS count_low,

    SUM(CASE WHEN cl.cl_to = 'NA-priority_mathematics_articles'

               OR cl.cl_to = 'Unknown-priority_mathematics_articles' THEN 1 ELSE 0 END) AS count_na

FROM

    # hubungan antar artikel

    page AS source

    INNER JOIN pagelinks AS pl ON source.page_title = pl.pl_from

    INNER JOIN linktarget AS lt ON pl.pl_target_id = lt.lt_id

    INNER JOIN page AS target ON lt.lt_title = target.page_title

​

    # source harus punya talk page dengan category ...

    INNER JOIN page AS talk ON source.page_title = talk.page_title

    INNER JOIN categorylinks AS cl ON talk.page_id = cl.cl_from

​

    # target harus punya talk page dengan category ...    

    INNER JOIN page AS talk2 ON target.page_title = talk2.page_title

    INNER JOIN categorylinks AS cl2 ON talk2.page_id = cl2.cl_from

​

WHERE

    # source ada di main dan bukan redirect

    source.page_namespace = 0

    AND source.page_is_redirect = 0

    # target ada di main dan bukan redirect

    AND target.page_namespace = 0

    AND target.page_is_redirect = 0

    # talk ada di talk :D

    AND talk.page_namespace = 1

    AND talk2.page_namespace = 1

    # source dan target harus bertopik matematika

    AND cl.cl_to IN (

      'Top-priority_mathematics_articles',

      'High-priority_mathematics_articles',

      'Mid-priority_mathematics_articles',

      'Low-priority_mathematics_articles',

      'NA-priority_mathematics_articles',

      'Unknown-priority_mathematics_articles')

    AND cl2.cl_to IN (

      'Top-priority_mathematics_articles',

      'High-priority_mathematics_articles',

      'Mid-priority_mathematics_articles',

      'Low-priority_mathematics_articles',

      'NA-priority_mathematics_articles',

      'Unknown-priority_mathematics_articles')

   GROUP BY title_target