Postgresql

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;

How to grant access to users in PostgreSQL? Here are some common statement to grant access to a PostgreSQL user:

Grant CONNECT to the database:

GRANT CONNECT ON DATABASE database_name TO username;

Grant USAGE on schema:

GRANT USAGE ON SCHEMA schema_name TO username;

Grant on all tables for DML statements: SELECT, INSERT, UPDATE, DELETE:

GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA schema_name TO username;

Grant all privileges on all tables in the schema:

GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA_name TO username;

Grant all privileges on all sequences in the schema:

GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA schema_name TO username;

Grant all privileges on the database:

GRANT ALL PRIVILEGES ON DATABASE database_name TO username;

Grant permission to create the database:

ALTER USER username CREATEDB;

Make a user superuser:

ALTER USER myuser WITH SUPERUSER;

Remove superuser status:

ALTER USER username WITH NOSUPERUSER;

Those statements above only affect the current existing tables.

To apply to newly created tables, you need to use alter default. For example:

ALTER DEFAULT PRIVILEGES FOR USER username IN SCHEMA schema_name GRANT SELECT, INSERT, UPDATE, DELETE ON TABLES TO username;