Free space in Tablespaces

SELECT dts.tablespace_name,NVL(ddf.bytes / 1024 / 1024, 0) avail,
NVL(ddf.bytes - NVL(dfs.bytes, 0), 0)/1024/1024 used,
NVL(dfs.bytes / 1024 / 1024, 0) free,
TO_CHAR(NVL((ddf.bytes - NVL(dfs.bytes, 0)) / ddf.bytes * 100, 0), '990.00') "Used %",
dts.contents,dts.extent_management,dts.status FROM sys.dba_tablespaces dts,
(select tablespace_name, sum(bytes) bytes
from dba_data_files group by tablespace_name) ddf,
(select tablespace_name, sum(bytes) bytes
from dba_free_space group by tablespace_name) dfs
WHERE dts.tablespace_name = ddf.tablespace_name(+)
AND dts.tablespace_name = dfs.tablespace_name(+)
AND NOT (dts.extent_management like 'LOCAL'
AND dts.contents like 'TEMPORARY')
UNION ALL
SELECT dts.tablespace_name,NVL(dtf.bytes / 1024 / 1024, 0) avail,
NVL(t.bytes, 0)/1024/1024 used,NVL(dtf.bytes - NVL(t.bytes, 0), 0)/1024/1024 free,
TO_CHAR(NVL(t.bytes / dtf.bytes * 100, 0), '990.00') "Used %",dts.contents,
dts.extent_management,dts.status
FROM sys.dba_tablespaces dts,
(select tablespace_name, sum(bytes) bytes
from dba_temp_files group by tablespace_name) dtf,
(select tablespace_name, sum(bytes_used) bytes
from v$temp_space_header group by tablespace_name) t
WHERE dts.tablespace_name = dtf.tablespace_name(+)
AND dts.tablespace_name = t.tablespace_name(+)
AND dts.extent_management like 'LOCAL'
AND dts.contents like 'TEMPORARY';