<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def format_sql(self):
 """ Builds the sql in a format that is easy for humans to read and debug :return: The formatted sql for this query :rtype: str """

        # TODO: finish adding the other parts of the sql generation
        sql = ''

        # build SELECT
        select_segment = self.build_select_fields()
        select_segment = select_segment.replace('SELECT ', '', 1)
        fields = [field.strip() for field in select_segment.split(',')]
        sql += 'SELECT\n\t{0}\n'.format(',\n\t'.join(fields))

        # build FROM
        from_segment = self.build_from_table()
        from_segment = from_segment.replace('FROM ', '', 1)
        tables = [table.strip() for table in from_segment.split(',')]
        sql += 'FROM\n\t{0}\n'.format(',\n\t'.join(tables))

        # build ORDER BY
        order_by_segment = self.build_order_by()
        if len(order_by_segment):
            order_by_segment = order_by_segment.replace('ORDER BY ', '', 1)
            sorters = [sorter.strip() for sorter in order_by_segment.split(',')]
            sql += 'ORDER BY\n\t{0}\n'.format(',\n\t'.join(sorters))

        # build LIMIT
        limit_segment = self.build_limit()
        if len(limit_segment):
            if 'LIMIT' in limit_segment:
                limit_segment = limit_segment.replace('LIMIT ', 'LIMIT\n\t', 1)
                if 'OFFSET' in limit_segment:
                    limit_segment = limit_segment.replace('OFFSET ', '\nOFFSET\n\t', 1)
            elif 'OFFSET' in limit_segment:
                limit_segment = limit_segment.replace('OFFSET ', 'OFFSET\n\t', 1)
            sql += limit_segment

        return sql