Oracle views the data size of a table

Example ：

select t.segment_name,bytes/1024/1024  as MB from user_segments t  where t.segment_name=' Table name should be capitalized ';

select t.segment_name,bytes/1024/1024 as MB from dba_segments  t where t.segment_name=' Table name should be capitalized ';

explain

user_segments You can only view the table data under the current user

dba_segments You can only view the table data under all users