| From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | Ertan Küçükoğlu <ertan(dot)kucukoglu(at)1nar(dot)com(dot)tr> |
| Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Advise on primary key for detail tables (OS: Raspberry Pi) |
| Date: | 2017-04-06 14:57:55 |
| Message-ID: | CAOR=d=0KYVHtWa51fkTo58kMttvCMeLGkZV6QMCaqLL3-tRfPQ@mail.gmail.com |
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| Lists: | pgsql-general |
On Thu, Apr 6, 2017 at 4:27 AM, Ertan Küçükoğlu
<ertan(dot)kucukoglu(at)1nar(dot)com(dot)tr> wrote:
> Sorry for top posting.
>
> I have a serial in master table because I need to know data insertion order.
> DateTime on Raspberry Pi is not accurate due to power loss and lack of
> internet access to fetch correct time from.
Note that serial / sequences do NOT guarantee exact order of
insertion. It's quite possible to have a few switched here and there.
It gets you an approximate order of insertion but a few values could
get swapped around depending on timing of your application and how you
do inserts. Just an FYI.
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