Comparing the tablespace growth

select ts.name "Tablespace", today.full,last_week.full "Full_LAST_WEEK"
from
( select tsu.tablespace_id, round(tsu.tablespace_usedsize/tsu.tablespace_maxsize
*100,0) as full
from
wrh$_tablespace_space_usage tsu
where to_char(to_date(substr(tsu.rtime,1,13),'MM/DD/YYYYHH24'),'MM/DD/YYYYHH24')
= to_char(sysdate,'MM/DD/YYYYHH24')
) today,
( select tsu.tablespace_id, round(tsu.tablespace_usedsize/tsu.tablespace_maxsize
*100,0) as full
from
wrh$_tablespace_space_usage tsu
where to_char(to_date(substr(tsu.rtime,1,13),'MM/DD/YYYYHH24'),'MM/DD/YYYYHH24'
)= to_char(sysdate-7,'MM/DD/YYYYHH24')
) last_week,
v$tablespace ts
where
ts.ts# = today.tablespace_id
and ts.ts# = last_week.tablespace_id
order by 1;