Re: unique constraint violation on multiple-rows update

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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