def select_column(self, key, column, **kwargs):
return self.get_storer(key).read_column(column=column, **kwargs)<EOL>
return a single column from the table. This is generally only useful to
select an indexable

Parameters
----------
key : object
column: the column of interest

Exceptions
----------
raises KeyError if the column is not found (or key is not a valid
    store)
raises ValueError if the column can not be extracted individually (it
    is part of a data block)