SQL Help

I want to find the free space and used space from a database. I wrote the following sql but does not work:

select sum(a.bytes) free, sum(b.bytes) used from dba_free_space a, dba_segments b
where a. tablespace_name=b.tablespace_name group by a.tablespace_name
/

What am I doing wrong? Received on Mon Aug 12 2002 - 11:05:47 CDT