52.9. pg_auth_members
 The catalog pg_auth_members shows the membership relations between roles. Any non-circular set of relationships is allowed. 
 Because user identities are cluster-wide, pg_auth_members is shared across all databases of a cluster: there is only one copy of pg_auth_members per cluster, not one per database. 
Table 52.9. pg_auth_members Columns
| Column Type Description | 
|---|
| 
 ID of a role that has a member | 
| 
  ID of a role that is a member of  | 
| 
 ID of the role that granted this membership | 
| 
  True if  |