private function getWhereClause()
	{
		if (empty($this->where)) {
			return '';
		}

		$result = [];

		foreach ($this->where as $key => $value) {
			$result[] = $this->getWhereCondition($value[0], $value[1], $value[2]);
		}

		return sprintf('WHERE %s', implode(' AND ', $result));
	}