Re: INSERT ... ON CONFLICT DO UPDATE - Mailing list pgsql-general

On 07/19/2015 08:04 AM, Rafal Pietrak wrote:

W dniu 19.07.2015 o 16:33, Adrian Klaver pisze:

On 07/19/2015 06:47 AM, Rafal Pietrak wrote:

Hi,

W dniu 19.07.2015 o 14:10, Geoff Winkless pisze:

On 19 July 2015 at 11:30, Rafal Pietrak <rafal@ztk-rp.eu

[---------------]

Although "a random" can duplicate its previous values, "my random(s)"
(which are created for this application purpose) cannot be duplicated
when it's stored in the database as "live active data". I understand,
that UNIQUE constraint is precisely the RDBMS tool to guarantee that.

 From my perspective the issue is, you are using a 'unique' key generator
that you know is not creating unique keys and then asking the database
to make it right. Sort of like making a square peg fit a round hole by
shaving the corners. It is possible but has sort of a messy feel to it.

Hmmm, yes.

Yet, I don't feel guilty as much, since that is quite similar to a
unique key on database "username", while the "generator" (human mind)
does not guarantee that. The DB just makes sure it does.

I think the argument to be made here is you have no control over what people choose as a username, you do have control over what your key generator outputs.

[--------------]

So an UPSERT is just one feature of ON CONFLICT. The other being DO
NOTHING. Therefore I could see an argument made for adding other ON
CONFLICT clauses. How difficult/plausible that would be is above my
level of expertise.

Mine too. But I'd say that the above wording exactly makes the point I
was trying to make. Thank you.

-R

--
Adrian Klaver
adrian.klaver@aklaver.com


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