> Leon <leon@udmnet.ru> writes:
> > We should make a real reference in one table to another! That
> > means there could be special data type called, say, "link",
> > which is a physical record number in the foreign table.
>
> There is no such thing as a physical record number for a tuple in
> Postgres. The closest you could come is an OID, which isn't really any
> faster than any other joinable field --- you still need an index to
> support fast lookup by OID.
Actually, there is:
select ctid from pg_class;
ctid ------(0,1) (0,2) ...
The number is the block number offset in the block. It doesn't help
because UPDATED rows would get a new tid. Tid's can be used for short
periods if you are sure the data in the table doesn't change, and there
is a TODO item to allow ctid reference in the WHERE clause.
-- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610)
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