SELECT DISTINCT(piv),COUNT(piv) AS kolikrat
FROM
  (SELECT CEIL(SUM(pullitr + 0.6 * tretinka + 0.8 * ctyrka + 0.5 * ctvrtka)) AS piv
  FROM zaznamy
  WHERE uid=17 AND YEAR(datum)=2015
  GROUP BY datum
  ORDER BY piv) AS dotaz
GROUP BY piv