The catalog pg_namespace stores namespaces.
   A namespace is the structure underlying SQL schemas: each namespace
   can have a separate collection of relations, types, etc. without name
   conflicts.
  
Table 52.32. pg_namespace Columns
| Name | Type | References | Description | 
|---|
| oid | oid |  | Row identifier (hidden attribute; must be explicitly selected) | 
| nspname | name |  | Name of the namespace | 
| nspowner | oid | pg_authid.oid | Owner of the namespace | 
| nspacl | aclitem[] |  | Access privileges; see
       GRANT and
       REVOKE
       for details |