PostgreSQL - How to grant access to users?

Here are some common statement to grant access to a PostgreSQL user:

1. Grant CONNECT to the database:

GRANT CONNECT ON DATABASE database_name TO username;

2. Grant USAGE on schema:

GRANT USAGE ON SCHEMA schema_name TO username;

3. 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;

4. Grant all privileges on all tables in the schema:

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

5. Grant all privileges on all sequences in the schema:

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

6. Grant all privileges on the database:

GRANT ALL PRIVILEGES ON DATABASE database_name TO username;

7. Grant permission to create database:

ALTER USER username CREATEDB;

8. Make a user superuser:

ALTER USER myuser WITH SUPERUSER;

9. 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;

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