查询某个表空间下所有的表的空间占用情况

select OWNER, t.segment_name, t.segment_type, sum(t.bytes / 1024 / 1024) mmm
from dba_segments t
where t.owner = 'STRONG_OCEAN_DUTY_PRO'
and t.segment_type='TABLE'
group by OWNER, t.segment_name, t.segment_type
order by mmm desc;