How does oracle view the tablespace name of the current user

How to query the tablespace name of the current user? Because oracle builds an index, you need to know the tablespace of the current user, and look up the data

   --Query syntax-- 
    select default_tablespace from dba_users where username = ' login user '
   

For example, my login user is TMS21, then the query syntax is

    /* View the tablespace the user belongs to */ 
   select default_tablespace from dba_users where username = ' TMS21 ' ;

The usage of related queries is also recorded by the way

1) Query the current user tablespace

 /* View the tablespace the user belongs to */ 
 select default_tablespace from dba_users where username = ' TMS21 ' ;

2) Query all tablespaces

  /* View all tablespaces */ 
   -- 1) Mode 1: dba_tablespaces -- 
   select  *  from dba_tablespaces;
     -- 2) Mode 2: v$tablespace -- 
   select  *  from v$tablespace;   

3) Query all tables under the user

  /* View all the tables under the user */  
  -- 1) Mode 1: user_tables -- 
   select  *  from user_tables;
    -- 2) Mode 2: dba_tables -- 
   select  *  from dba_tables where owner = ' TMS21 ' ;

4) Query the users under the tablespace

  /* Check how many users there are in the tablespace, the name of tablespace_name must be capitalized */ 
   select  distinct s.owner from dba_segments s where s.tablespace_name = ' TMS21 ' ;  

Source: https://blog.csdn.net/qq_26941173/article/details/77155421