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From: Vik Fearing <[email protected]>
To: Surafel Temesgen <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: WIP: System Versioned Temporal Table
Date: Mon, 28 Oct 2019 16:36:09 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CALAY4q8ETRoFLBR8qz1P=SNskBBW5z-Kr90t_XGrm9mc9zCEbQ@mail.gmail.com>
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On 28/10/2019 13:48, Surafel Temesgen wrote:
>
>
> On Fri, Oct 25, 2019 at 10:45 PM Vik Fearing
> <[email protected] <mailto:[email protected]>> wrote:
>
>     >
>     >     I don't understand what you mean by this.
>     >
>     >
>     >
>     > The primary purpose of adding row end time to primary key is to
>     allow
>     > duplicate value to be inserted into a table with keeping
>     constraint in
>     > current data but it can be duplicated in history data. Adding row
>     > start time column to primary key will eliminate this uniqueness for
>     > current data which is not correct  
>
>
>     How?  The primary/unique keys must always be unique at every point
>     in time.
>
>
> From user prospect it is acceptable to delete and reinsert a record
> with the same key value multiple time which means there will be
> multiple record with the same key value in a history data but there is
> only one values in current data as a table without system versioning
> do .I add row end time column to primary key to allow user supplied
> primary key values to be duplicated in history data which is acceptable
>

Yes, I understand that.  I'm saying you should also add the row start
time column.

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