# pg_namespace

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`. |
| `nspdboid` | oid       |               | the oid of the database namespace belong to.        |