private function getSqlGroupBy() { $zoneColumnName = Gpf_Common_DateUtils::getSqlTimeZoneColumn('t.'.Pap_Stats_Table::DATEINSERTED); switch($this->timeGroupBy) { case Gpf_Common_DateUtils::DAY: return "TO_DAYS($zoneColumnName)"; case Gpf_Common_DateUtils::WEEK: return "YEAR($zoneColumnName), WEEK($zoneColumnName)"; case Gpf_Common_DateUtils::MONTH: return "YEAR($zoneColumnName), MONTH($zoneColumnName)"; case Gpf_Common_DateUtils::YEAR: return "YEAR($zoneColumnName)"; } }