Re: [SQL] SQL Spec Compliance Questions

Joe Conway <mail@joeconway.com> writes:
>>> 4.16.2 Referenceable tables, subtables, and supertables
>>> A table BT whose row type is derived from a structured type ST is
>>> called a typed table. Only a base table or a view can be a typed
>>> table. A typed table has columns corresponding, in name and
>>> declared type, to every attribute of ST and one other column REFC
>>> that is the self-referencing column of BT; let REFCN be the

> After re-reading it, I think it is related to (or at least similar to)
> the work Tom is currently doing to allow composite types as table
> attributes.

The "structured type" stuff seems closely related, but I do not
understand the business about a "self-referencing column".  I have a
feeling that it might be a mutant version of our notion of inheritance
...

            regards, tom lane