How do you determine the size of a table in mb

Hi,
I have a table which holds a number of pdf docs - I need to find out how large the table is in mb
How do you do it - is there an sql command ?
Thanks in anticicpation
SD.

Many thanks ............
select sum(bytes)/1024/1024
from user_segments
where segment_name in (select segment_name from user_lobs
where table_name = 'SUPPORTING_DOCUMENT')
or segment_name = 'SUPPORTING_DOCUMENT'
This sql does the trick and tallies with some rather manual calcuations I have done in sql sum(doc_size) on the docs table.
As a newbie please could you explain segments ?
Thanks in anticpation
SD.

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