How to autoextend just one file from existing tablespace?

Hi,
I discover some of the tablespaces did not have autoexent feature, i.e. none of the datafiles have been autoextend features
so I need to autoextend it, hopefully the data file which has the most free space. So it would be good if I can come up with a query to find out which datafile belonging to a tablespace which currently has the highest free space could be selected for extend features,
To get me on the right track,
which dynamic views/data dictionary do I need to look up?
v$datafile/v_$datafile
dba_free_space
v$tablespace
when should I use v$datafile? when should I use v_$datafile.
thanks a lot!

There seems to be some basic confusion.
AUTOEXTEND is not going to reuse the space within a data file; it is going acquire more space for the same file on the disk.
You can lookup dba_data_files.autoextensible column to check if your file is autoextensible or not.
when should I use v$datafile? when should I use v_$datafile.v$datafile is just a synonym for v_$datafile.

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How to autoextend just one file from existing tablespace?

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