how to create an admin user postgresql 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: psql create user

# https://www.postgresql.org/docs/8.0/sql-createuser.html
CREATE USER <username> WITH PASSWORD '<password>' VALID UNTIL '<date here>';