/**
	 * Builds the WHERE part
	 * 
	 * @return string
	 */
	protected function _buildWherePart()
	{
		$sql = '';
		
		$where = $this->_query->getConditionString();
		if (!empty($where)) {
			$sql = ' WHERE ' . $where;
		}
		
		return $sql;
	}