Re: REFERENCES constraint

Cedar,

> 1. Can a column reference more than one table? (This assumes you use
> a
> single sequence to generate the IDs for both "tbla" and "tblb". I
> guess
> you would also have the problem of enforcing a unique index. Say
> what?!
> A unique index across multiple tables.. absurd :) eg..
>
> CREATE TABLE blah (
> id int4,
> f_id int4 REFERENCES tbla (id) REFERENCES tblb (id)
> )

I'd reccomend, instead, having blah reference tbla and tbla reference
tblb. It'd have the same effect, without forcing you to monkey around
with custom triggers.

> 2. Can a column reference another column in the same table? eg..
>
> CREATE TABLE bloo (
> id int4,
> p_id int4 REFERENCES bloo (id)
> -- or
> --p_id int4 REFERENCES (id)
> )

Er ... why would you want to?

-Josh Berkus

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