How to query user's table space in oracle

In Oracle, you can use "default_tablespace" to query the user's table space. The syntax is "select default_tablespace from dba_users where username='username'", where the user name must be in uppercase letters.

The operating environment of this tutorial: Windows 10 system, Oracle 11g version, Dell G3 computer.

How oracle queries the user’s table space

1) Query the current user table space

 select default_tablespace from dba_users where username='TMS21';

2) Query all table spaces

   -- 1 ）方式1：dba_tablespaces --
   select * from dba_tablespaces;
    --2 ）方式2：v$tablespace --
   select * from v$tablespace;

3) Query all tables under a user

  /* 查看用户下面的所有的表 */ 
  -- 1 ）方式1：user_tables --
   select * from user_tables;
   --2 ）方式2: dba_tables --
   select * from dba_tables where owner='TMS21';

4) Query users under a table space

  /*查看表空间下有多少用户，tablespace_name表空间 的名字一定要大写 */
   select distinct s.owner from dba_segments s where s.tablespace_name ='TMS21';

Recommended tutorial: " Oracle Tutorial》

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