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pg_namespace

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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.
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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