Find size of a table and Associated segments ( index , lob )

COLUMN TABLE_NAME FORMAT A32
COLUMN OBJECT_NAME FORMAT A32
COLUMN OWNER FORMAT A10

SELECT
   owner, table_name,segment_type, TRUNC(sum(bytes)/1024/1024/1024) Size_GB
    FROM
      (SELECT segment_name table_name, owner, bytes ,segment_type
       FROM dba_segments  WHERE segment_type = 'TABLE'
UNION ALL
     SELECT i.table_name, i.owner, s.bytes ,segment_type FROM dba_indexes i, dba_segments s
      WHERE s.segment_name = i.index_name AND   s.owner = i.owner
     AND   s.segment_type = 'INDEX'
UNION ALL
    SELECT l.table_name, l.owner, s.bytes ,segment_type
    FROM dba_lobs l, dba_segments s
    WHERE s.segment_name = l.segment_name
    AND   s.owner = l.owner
    AND   s.segment_type = 'LOBSEGMENT'
  UNION ALL
 SELECT l.table_name, l.owner, s.bytes ,segment_type
    FROM dba_lobs l, dba_segments s
    WHERE s.segment_name = l.index_name
    AND   s.owner = l.owner
    AND   s.segment_type = 'LOBINDEX')
WHERE owner ='&owner'
   and table_name='&table'
   GROUP BY owner,table_name,segment_type
   ORDER BY SUM(bytes) desc
  /


OWNER      TABLE_NAME          SEGMENT_TYPE          SIZE_GB
---------- -------------------------------- ------------------ -------------------------
SUMIT     TABLE_BIG                   LOBSEGMENT                3196
SUMIT     TABLE_BIG                   TABLE                               121
SUMIT     TABLE_BIG                   INDEX                                111
SUMIT     TABLE_BIG                   LOBINDEX                         51