The pg_namespace system catalog table 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 1. pg_catalog.pg_namespace

column type references description
nspname name   Name of the namespace
nspowner oid pg_authid.oid Owner of the namespace
nspacl aclitem[]   Access privileges as given by GRANT and REVOKE.