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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.
pg_namespace
Column Type
Description
oid oid
oid
Row identifier
nspname name
nspname
name
Name of the namespace
nspowner oid (references pg_authid.oid)
nspowner
pg_authid
Owner of the namespace
nspacl aclitem[]
nspacl
aclitem[]
存取權限； 詳見 5.7 節