how to create a user with database in psql code example

Example 1: create db user postgres

sudo -u postgres psql
postgres=# create database mydb;
postgres=# create user myuser with encrypted password 'mypass';
postgres=# grant all privileges on database mydb to myuser;

Example 2: create new user in postgres

CREATE USER visualscrapy WITH PASSWORD '123456';
# it will create the new user in postgres