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From: Scott Ribe <[email protected]>
To: David G. Johnston <[email protected]>
To: Tom Lane <[email protected]>
Cc: Pgsql-admin <[email protected]>
Subject: Re: update behavior
Date: Thu, 19 Jun 2025 11:48:30 -0600
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<CAKFQuwbwAbbk6KUKXyX2VxpX3aUDhS5Zd__2JKQXdhH5zHaB4g@mail.gmail.com>
	<[email protected]>
	<[email protected]>

> On Jun 19, 2025, at 11:39 AM, Scott Ribe <[email protected]> wrote:
> 
>> On Jun 19, 2025, at 11:34 AM, Scott Ribe <[email protected]> wrote:
>> 
>>> On Jun 19, 2025, at 11:31 AM, David G. Johnston <[email protected]> wrote:
>>> 
>>> Correct.  You need a trigger to prevent the update.  There is one provided: suppress_redundant_updates_trigger()
>> 
>> Or, in my case that prompted this question, I need a WHERE clause for the ON CONFLICT UPDATE...
> 
> Wait, should suppress_redundant_updates_trigger be used even in this case? Would it suppress the update before the constraint checks and invocation of the ON CONFLICT clause???

Or no, duh, this starts with an INSERT where that won't be run, there is no UPDATE until after the constraint violation, but then at that point it would suppress the update?

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