pg_namespace

PostgreSQL 9.5.4 Documentation
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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 49-31. 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

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