Re: Concurrently updating an updatable view

Richard Huxton wrote:
> Hiroshi Inoue wrote:
>> Florian G. Pflug wrote:
>>
>>> I think there should be a big, fat warning that self-referential
>>> updates have highly non-obvious behaviour in read-committed mode,
>>> and should be avoided.
>>
>> It seems pretty difficult for PostgreSQL rule system to avoid such
>>  kind of updates. I'm suspicious if UPDATABLE VIEWS can be implemented
>>  using the rule system.
> 
> Remember this affects all self-referential joins on an UPDATE (and 
> DELETE?) not just views. It's just that a rule is more likely to produce 
> that type of query.

Is there consensus what the correct behaviour should be for
self-referential updates in read-committed mode? Does the SQL Spec
have anything to say about this?

greetings, Florian Pflug