Select data from another database

Hi,
Is it possible to retrieve data from a table from another database?
For instance, I have two databases db_1 and db_2
I login to the database db_1 using
sqlplus username/psw@db1
and to the database db_2 using
sqlplus username/psw@db2
In SQL> db1 I would like to use select statement from a table in the db2. Is it possible?
Another question:
I have two tablespaces TP1 and TP2 in the database db1
The TP1 is my default tablespace.
Can I switch from TP1 to TP2 tablespace in the sqlplus?
If not, how can I select all tables obtained in the TP2? Or how can I select data from a table in the TP2?
Thanks

I don't know how to create a db link. 
SQL Reference Guide - CREATE DATABASE LINK 
There are some examples in the doc above. 
 
What about if db1 and db2 have the same table name? No problem, exactly like when you have two same table name accross two schemas on same database. The table suffixed by the dblink name come from the other schema of other database (schema which you use to connect through the dblink to the other database). 
 
Nicolas.

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> Page 48, Developing a Web Database Application . . .
speaks about making a
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Respect the forum rules and common sense, and you will be respected.
"how to select data from a database table when the field is blank" is very basic, and basic questions will be locked, because they have been asked many times and you can find the answer yourself with a little effort. There is nothing disrespectful about it.
Thread locked.
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