OpenCart 🇺🇦

$sql = "SELECT ct.customer_id, CONCAT(c.firstname, ' ', c.lastname) AS customer, c.email, cgd.name AS customer_group, c.status, SUM(ct.amount) AS total FROM " . DB_PREFIX . "customer_transaction ct LEFT JOIN `" . DB_PREFIX . "customer` c ON (ct.customer_id = c.customer_id) LEFT JOIN " . DB_PREFIX . "customer_group_description cgd ON (c.customer_group_id = cgd.customer_group_id) WHERE cgd.language_id = '" . (int)$this->config->get('config_language_id') . "'";

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

if (!empty($data['filter_date_end'])) {
	$sql .= "DATE(ct.date_added) <= '" . $this->db->escape($data['filter_date_end']) . "'";
}
		
$sql .= " GROUP BY ct.customer_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;