def _make_col_qual_name(col_name, parent_table_name):
    """
    Generate a standardized qualified name for column entities.

    :param str col_name: The column name.
    :param str parent_table_name: The parent table name.

    :return: The qualified name for the column.
    :rtype: str
    """
    return f"{parent_table_name}#{col_name}"