SQL & PL/SQL

Hello guys,
I was wondering how can I count the rows in a table that is being retrieved from dba_segments.

-- I am getting the table name from dba_segment
-- Is it possible to count the number of rows in that table at the same time?
-- If not, is there an alternative step without analyzing the table or schema, then getting the result from num_rows in all_tables?

I want the count code to add to the select statement..

SELECT owner, segment_name , segment_type, partition_name, bytes
FROM   dba_segments
WHERE  owner = UPPER( v_schema )
ORDER BY segment_name;

I try to add this to the select statement. count(segment_name), but that did not work.

Any direction(s)?