Show Used/Free Space Datafile wise in Oracle DB

This script will list datafile wise Allocated size, Used Size and Free Size. For running this query you must have SELECT privileges to V$DATAFILE and DBA_FREE_SPACE views.
SELECT   SUBSTR (df.NAME, 1, 40) file_name, df.bytes / 1024 / 1024 "Allocated Size(MB)",
         ((df.bytes / 1024 / 1024) - NVL (SUM (dfs.bytes) / 1024 / 1024, 0)) "Used Size (MB)",
         NVL (SUM (dfs.bytes) / 1024 / 1024, 0) "Free Size(MB)"
    FROM v$datafile df, dba_free_space dfs
   WHERE df.file# = dfs.file_id(+)
GROUP BY dfs.file_id, df.NAME, df.file#, df.bytes
ORDER BY file_name;

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