\l - Display database
\c - Connect to database
\dn - List schemas
\dt - List tables inside public schemas
\dt schema1. - List tables inside particular schemas. For eg: 'schema1'.

如果在docker exec中使用PSQL，它是这样的:

docker exec -e "PGOPTIONS=--search_path=<your_schema>" -it docker_pg psql -U user db_name

要更改数据库吗?

\l - to display databases
\c - connect to new database

更新。

我又看了一遍你的问题。 显示模式

\dn - list of schemas

要改变模式，您可以尝试

SET search_path TO

这是旧的，但我把导出放在我的别名连接到db:

alias schema_one.con="PGOPTIONS='--search_path=schema_one' psql -h host -U user -d database etc"

对于另一个schema:

alias schema_two.con="PGOPTIONS='--search_path=schema_two' psql -h host -U user -d database etc"

PostgreSQL 14 Debian

    postgres@ovhswift:~$ psql
psql (14.0 (Debian 14.0-1.pgdg100+1))
Type "help" for help.

postgres=# create database test;
CREATE DATABASE
postgres=# \c test
You are now connected to database "test" as user "postgres".
test=# create schema tests;
CREATE SCHEMA
test=# \dt
Did not find any relations.
test=# create table pubtable (id integer);
CREATE TABLE
test=# create table tests.schematable (id integer);
CREATE TABLE
test=# \dt
          List of relations
 Schema |   Name   | Type  |  Owner
--------+----------+-------+----------
 public | pubtable | table | postgres
(1 row)

test=# \dt tests.
Did not find any relation named "tests.".
test=# \dt tests
Did not find any relation named "tests".
test=# \dt 'tests.'
Did not find any relation named "tests.".
test=# \dt 'tests.*'
            List of relations
 Schema |    Name     | Type  |  Owner
--------+-------------+-------+----------
 tests  | schematable | table | postgres
(1 row)

test=# \dt 'tests*'
Did not find any relation named "tests*".
test=# \dt 'tests.*'
            List of relations
 Schema |    Name     | Type  |  Owner
--------+-------------+-------+----------
 tests  | schematable | table | postgres
(1 row)

对于\dv等，同样可以查看模式中的视图

快速解决方案可以是:

SELECT your_db_column_name from "your_db_schema_name"."your_db_tabel_name";