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
       |