Re: SQL2011 and writeable CTE

2010/11/8 Hitoshi Harada <umi.tanuki@gmail.com>:
> 2010/11/8 Peter Eisentraut <peter_e@gmx.net>:
>> On sön, 2010-11-07 at 21:28 +0900, Hitoshi Harada wrote:
>>> I've read this Peter's post:
>>>
>>> http://petereisentraut.blogspot.com/2010/04/news-from-sql-standard.html
>>>
>>> which says in SQL2011 has a new feature:
>>>
>>> > Combined data change and retrieval. PostgreSQL does something like this with RETURNING, but this feature is more
elaborateand allows the writing of "delta tables". 
>>>
>>> And I heard from sources that this "delta table" contains something
>>> like writeable CTEs. Couldn't you share something about it if
>>> possible? I just don't like to design something that will be similar
>>> to but different from the standard.
>>
>> Yeah, actually, after further study, this has nothing to do with actual
>> delta tables, and it is in fact exactly the RETURNING feature in
>> combination with the possibility to embed it into a superordinate query.
>
> Hmm, this looks very different from our writeable CTEs. And I can see
> many issues like syntax ambiguity and execution order if we support
> it. AFAIK the most significant reason why we are working on CTEs is
> that CTEs are regarded as something like materialized table.
>
> So I think we are going on writeable "CTEs" unless there are no
> objection rather than pursuing the standard.
> Thanks for sharing anyway.
>

I found, so writeable CTE was implemented in Microsoft SQL server too.
Can be our implementation compatible?

Regards

Pavel

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> Hitoshi Harada
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