SQL> drop view vstablespace;
SQL> create view vstablespace as
(
select
a.tablespace_name "TABLESPACE",
sum(a.bytes) SUM ,
sum(b.bytes) FREE ,
sum(b.bytes)/sum(a.bytes)*100 PRECENTFREE
from
dba_data_files
a,dba_free_space b
where
a.file_id=b.file_id
group by a.tablespace_name
)