# su - postgres
-bash-4.2$ psql
psql (9.6.17)
Type "help" for help.

postgres=# \l 
                                    List of databases
    Name    |    Owner     | Encoding |   Collate   |    Ctype    |   Access privileges   
------------+--------------+----------+-------------+-------------+-----------------------
 dbpostgres | betapostgres | UTF8     | UTF-8 | UTF-8 | 
 pb_storage | pb_storage   | UTF8     | UTF-8 | UTF-8 | 
 postgres   | postgres     | UTF8     | UTF-8 | UTF-8 | 
 template0  | postgres     | UTF8     | UTF-8 | UTF-8 | =c/postgres          +
            |              |          |       |       | postgres=CTc/postgres
 template1  | postgres     | UTF8     | UTF-8 | UTF-8 | =c/postgres          +
            |              |          |             |             | postgres=CTc/postgres
(5 rows)

postgres=# \c dbpostgres 
You are now connected to database "dbpostgres" as user "postgres".
dbpostgres=# \dt
        List of relations
 Schema | Name | Type  |  Owner   
--------+------+-------+----------
 public | pgqs | table | postgres
(1 row)

dbpostgres=# SELECT pg_tables.tablename, pgqs.created_at
dbpostgres-#       FROM pg_tables
dbpostgres-# INNER JOIN pgqs
dbpostgres-#         ON pg_tables.tablename = pgqs.tablename;
ERROR:  column pgqs.tablename does not exist
LINE 4:         ON pg_tables.tablename = pgqs.tablename;