SELECT tbs  表空间名,
sum(totalM) 总共大小M,
sum(usedM) 已使用空间M,
sum(remainedM) 剩余空间M,
sum(usedM)/sum(totalM)*100 已使用百分比,
sum(remainedM)/sum(totalM)*100 剩余百分比
FROM (
   SELECT b.file_id　　ID,
   b.Tablespace_name　　tbs,
   b.file_name　　　　　name,
   b.bytes/1024/1024　　　　　　　totalM,
   (b.bytes-sum(nvl(a.bytes,0)))/1024/1024　　　usedM,
   sum(nvl(a.bytes,0))/1024/1024　　　　　　　　remainedM,
   sum(nvl(a.bytes,0))/(b.bytes)*100　剩余百分比 ,
   (100 - (sum(nvl(a.bytes,0))/(b.bytes)*100))　已使用百分比
   FROM dba_free_space a,dba_data_files b
   WHERE a.file_id=b.file_id
   GROUP BY b.Tablespace_name,b.file_name,b.file_id,b.bytes
   ORDER BY b.Tablespace_name
)
GROUP BY tbs;