| From: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
|---|---|
| To: | Konstantin Knizhnik <k(dot)knizhnik(at)postgrespro(dot)ru> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: AS OF queries |
| Date: | 2017-12-26 21:52:36 |
| Message-ID: | CAMkU=1yUHdLb2T9P6j+bFOrnzB1QAQ0b0E-c+b2U57Mvd2_DRA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Dec 21, 2017 at 6:00 AM, Konstantin Knizhnik <
k(dot)knizhnik(at)postgrespro(dot)ru> wrote:
> There is still one significant difference of my prototype implementation
> with SQL standard: it associates timestamp with select statement, not with
> particular table.
> It seems to be more difficult to support and I am not sure that joining
> tables from different timelines has much sense.
> But certainly it also can be fixed.
I think the main use I would find for this feature is something like:
select * from foo except select * from foo as old_foo as of '<some time>';
So I would be grateful if you can make that work. Also, I think conforming
to the standards is pretty important where it is feasible to do that.
Cheers,
Jeff
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