protected function setOperations(array $setOperations): string
	{
		if(empty($setOperations))
		{
			return '';
		}

		$sql = '';

		foreach($setOperations as $setOperation)
		{
			$sql .= $this->subquery($setOperation['query'], false) . ' ' . $setOperation['operation'] . ' ';
		}

		return $sql;
	}