OpenCart 🇺🇦

$sql = "SELECT ch.coupon_id, c.name, c.code, COUNT(DISTINCT ch.order_id) AS `orders`, SUM(ch.amount) AS total FROM `" . DB_PREFIX . "coupon_history` ch LEFT JOIN `" . DB_PREFIX . "coupon` c ON (ch.coupon_id = c.coupon_id)"; 

$implode = array();

if (!empty($data['filter_date_start'])) {
	$implode[] = "DATE(ch.date_added) >= '" . $this->db->escape($data['filter_date_start']) . "'";
}

if (!empty($data['filter_date_end'])) {
	$implode[] = "DATE(ch.date_added) <= '" . $this->db->escape($data['filter_date_end']) . "'";
}

if ($implode) {
	$sql .= " WHERE " . implode(" AND ", $implode);
}
		
$sql .= " GROUP BY ch.coupon_id ORDER BY total DESC";

if (isset($data['start']) || isset($data['limit'])) {
	if ($data['start'] < 0) {
		$data['start'] = 0;
	}			

	if ($data['limit'] < 1) {
		$data['limit'] = 20;
	}	
	
	$sql .= " LIMIT " . (int)$data['start'] . "," . (int)$data['limit'];
}	

$query = $this->db->query($sql);

return $query->rows;