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From: Karsten Hilbert <[email protected]>
To: [email protected]
To: pgsql-general <[email protected]>
Subject: Re: unique constraint violation on multiple-rows update
Date: Sun, 19 Apr 2026 15:43:51 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Am Sun, Apr 19, 2026 at 03:17:07PM +0200 schrieb Karsten Hilbert:

> 	WITH cte AS (
> 		SELECT pk, list_position
> 		FROM clin.export_item
> 		WHERE
> 			list_position >= _target_position
> 		ORDER BY
> 			list_position DESC
> 	)
> 	UPDATE clin.export_item SET
> 		list_position = cte.list_position + 1
> 	FROM cte
> 	WHERE
> 		clin.export_item.pk = cte.pk;
> 
> Running that does violate the (non-deferred) UNIQUE
> constraint on the table column, however.

Wait, should that UPDATE have been:

 	UPDATE clin.export_item SET
 		list_position = list_position + 1
 	FROM cte
 	WHERE
 		clin.export_item.pk = cte.pk;

(note the lack of "cte." on the "list_position + 1")

Karsten
-- 
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