\dx Postgres 查看EXTENSION

#创建

postgres=> \c testdb1

You are now connected to database "testdb1" as user "user1".

testdb1=> create extension postgres_fdw;

CREATE EXTENSION

#查看

testdb1=> \dx

List of installed extensions

Name | Version | Schema | Description

--------------+---------+------------+----------------------------------------------------

plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language

postgres_fdw | 1.1 | public | foreign-data wrapper for remote PostgreSQL servers

(2 rows)