Лесно е, просто вижте примера.
-моите бази данни
postgres=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+---------+-------+---------------------------
francs | postgres | UTF8 | C | C | =Tc/postgres +
| | | | | postgres=CTc/postgres +
| | | | | francs=C*T*c*/postgres +
| | | | | select_only=c/francs
postgres | postgres | UTF8 | C | C |
source_db | postgres | UTF8 | C | C | =Tc/postgres +
| | | | | postgres=CTc/postgres +
| | | | | source_db=C*T*c*/postgres
template0 | postgres | UTF8 | C | C | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | C | C | =c/postgres +
| | | | | postgres=CTc/postgres
(5 rows)
--преминете към db франкове като ролеви франкове
postgres=# \c francs francs
You are now connected to database "francs" as user "francs".
--преминаване към db postgres като роля postgres
francs=> \c postgres postgres
You are now connected to database "postgres" as user "postgres".
postgres=#
--прекъснете връзката с db
postgres=# \q