pg_user
The view pg_user provides access to information about database users. This is simply a publicly readable view of pg_shadow that blanks out the password field.
Table pg_user Columns
| Column Type Description | 
|---|
 User name  | 
 ID of this user  | 
 User can create databases  | 
 User is a superuser  | 
 User can initiate streaming replication and put the system in and out of backup mode.  | 
 User bypasses every row-level security policy.  | 
 Not the password (always reads as   | 
 Password expiry time (only used for password authentication)  | 
 Session defaults for run-time configuration variables  |