From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
---|---|
To: | soumik(dot)bhattacharjee(at)kpn(dot)com |
Cc: | pgsql-admin <pgsql-admin(at)postgresql(dot)org>, Pgsql-admin <pgsql-admin(at)lists(dot)postgresql(dot)org> |
Subject: | Re: Composite primary key duplicate records - Issue In PostgreSQL But not in Oracle |
Date: | 2020-04-22 14:09:19 |
Message-ID: | CAKFQuwZwF8eUAxnxzvFWBQpeWwBDMew1Dhtu7rX=KcHM9S92MA@mail.gmail.com |
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Lists: | pgsql-admin |
On Wed, Apr 22, 2020 at 6:54 AM <soumik(dot)bhattacharjee(at)kpn(dot)com> wrote:
> Hi Experts,
>
>
>
> We are migrating Oracle to PostgreSQL and facing a challenge related to
> constrains.
>
>
>
> In Oracle database there are lot of table consists of composite primary
> key which having duplicate records.
>
>
>
> *Example*
>
>
>
> - Oracle table : --CONSTRAINT "TTT_PRX" PRIMARY KEY ("COL1", "COL2")
> – UNIQUE à *Here in Oracle there is no issue*
>
>
>
> - In PostgreSQL if I want to add the constraint post migration it
> throws error as duplicate record for COL1 (which is a number) as per
> business need, COL2 is date which is unique always.
>
>
>
> *alter table table_name add constraint ttt_prx unique(**COL1**,** COL2*
> *);*
>
>
>
> *COL1*
>
> *COL2*
>
> *Count*
>
> 102022194
>
> 21-9-2019
>
> 1
>
> 102022194
>
> 30-9-2019
>
> 1
>
> 102022194
>
> 30-9-2019
>
> 1
>
>
>
>
>
> *Is there a way to handle this in PostgreSQL?*
>
>
>
If Oracle is telling you that having two records (102022194,30-9-2019) is
not a violation of the defined unique constraint over those two columns it
is wrong. PostgreSQL is handling this correctly.
Maybe you had a full-on timestamp in Oracle but in moving it to PostgreSQL
you mis-typed it as a date so the difference in the time portion of the two
records has been lost?
David J.
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