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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