> I was on linux, although I just installed 8.0b2 dev 3 to my windows box
> and tried #2 and still got a success.

Let me guess - did you use psql? I found that mentioned scenarios run successfuly 
under psql but pgAdmin's console and PHP driven invocation lead to fail (even with own 
Slackware 10 driven host server under pgsql 8.0.0 beta 2 (seems to be the same as 
you)).

> Are you sure that the constraint wasn't deferred and/or that you weren't
> doing this inside a function?

As i told, under pgAdmin's console and PHP it fails anyway but psql falls only with 
function invocation.

> In the former case there's a reading of spec
> question for the timing of the actions (are they on the statement or at
> check time -- we've done the latter although a rereading implies that we
> may have previously read it wrong) and the latter, up until Tom's very
> recent patch, any AFTER triggers (or foreign keys) waited until the end of
> the original statement from the user to run.

I misunderstood this sentence... Do you wanna told me that within single statements 
batch there could be non-serializable execution? If true then it seems to be a 
architectual issue (i could expect parallel execution within single sql statement but 
all constraints have to be checked right after it finished - not before and not after, 
just at a statement execution finish moment). Otherwise it is a bug anyway, imho.

In attachment you'll find sample scenarios that lead psql to fail under *nix.

NB: Scripts have to be placed at /tmp folder otherwise you'll need to fix check_uq.sh.


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