There are two different kind of roles: groups and users. For most kinds of obj ... To allow other roles or users to use it, privileges or permission must be granted. Roles PostgreSQL uses roles for authentication. You need to login as database super user under postgresql server. The folder C:\Users\postgres will be the profile folder for a user named "postgres". Adding an existing user to a database. For example: Username Roles user1 role1_rw, role2_ro, rol3_rw user2 role2_rw I cannnot use psql meta-commands as this result set will be merged with some other queries to do analysis of the grants. I have an audit requirement to query all roles granted to users; listed by user. Following are the most commonly used PostgreSQL user-related meta commands: The \du command will show all of the existing PostgreSQL users. The \du __user_name__ command will list a specific username, if it exists. By running psql postgres in your terminal, you’ll automatically login with your macOS username to PostgreSQL, therefore accessing the role created. When first installing PostgreSQL on macOS, the script created a role with your macOS username, with a list of permissions granted. For example if the privilege is =Tc/postgres then all roles may connect and create temporary tables in that particular database and it is the postgres user who granted the privilege. PostgreSQL Permission Concepts. Again the simplest way to connect as the postgres user is to change to the postgres unix user on the database server using su command as follows: # su - postgres. If a user is created with the INHERIT property set, it will inherit permissions from the groups it belongs to. But Postgres is a large database management package. PostgreSQL users that have permission to create databases can do so from their own accounts by typing the following command, where dbname is the name of the database to create: createdb dbname . user = privileges / granted by Omitting user means that PUBLIC is granted the privilege, ie all roles. PostgreSQL establishes the capacity for roles to assign privileges to database objects they own, enabling access and actions to those objects. Step #3: Now connect to database server. Permissions for database access within PostgreSQL are handled with the concept of a role, which is akin to a user. PostgreSQL (or simply "postgres") manages permissions through the concept of "roles". Query below returns list of users in current database. Roles can own database objects (for example, tables) and can assign privileges on those objects to other roles to control who has access to which objects. Roles can represent groups of users in the PostgreSQL ecosystem as well. PostgreSQL - PRIVILEGES - Whenever an object is created in a database, an owner is assigned to it. There are no users in PostgreSQL, just roles. To grant an existing user privileges to a database, follow these steps: user_id - id of the user; usename - user name Roles are different from traditional Unix-style permissions in that there is no distinction between users and groups. Users and groups can belong to groups; The only difference is that users can be used to log-in to a database. Query select usesysid as user_id, usename as username, usesuper as is_superuser, passwd as password_md5, valuntil as password_expiration from pg_shadow order by usename; Columns. Common PostgreSQL User Commands. PostgreSQL manages database access permissions using the concept of roles.A role can be thought of as either a database user, or a group of database users, depending on how the role is set up. The create role __rolename__ meta command will create a role against an existing PostgreSQL username. 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