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        SELECT<br />
          COUNT(id_article) AS total, id_category<br />
        FROM<br />
          eshop_articles_categorys<br />
          WHERE<br />
          id_article IN (SELECT id FROM eshop_articles WHERE sold<1) GROUP BY id_category<br />
        <br />
          <br />
          <br />
          <br />
        ;<br />