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From: Peter Geoghegan <[email protected]>
To: yudhi s <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: Duplicate key error
Date: Mon, 11 Nov 2024 15:04:43 -0500
Message-ID: <CAH2-Wz=bSrxrEF_xsz+jLgiqQqE=n2_PZPe-GzRsSz6k6-Vr9A@mail.gmail.com> (raw)
In-Reply-To: <CAEzWdqeKafRTLDSP-0Ffw8nijQPUXKpgaHxMXoqz0yEdad-2aA@mail.gmail.com>
References: <CAEzWdqeKafRTLDSP-0Ffw8nijQPUXKpgaHxMXoqz0yEdad-2aA@mail.gmail.com>

On Mon, Nov 11, 2024 at 12:41 AM yudhi s <[email protected]> wrote:
> So it means it will ensure no duplication happens for ID values, but still we are seeing "duplicate key" error. So what is the possible reason here or are we encountering any buggy behaviour here?

MERGE doesn't actually make any promises about not getting unique
violations. Only ON CONFLICT DO UPDATE (and ON CONFLICT DO NOTHING)
make such a promise. That's the main reason why Postgres supports
both.

-- 
Peter Geoghegan

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