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From: Laurenz Albe <[email protected]>
To: Holger Jakobs <[email protected]>
To: [email protected]
Subject: Re: Technical validation on altering atttypmod for numeric column in PostgreSQL
Date: Mon, 23 Mar 2026 14:57:37 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <BN7PR10MB2609BBFDA87D4BBC22ABF14D824BA@BN7PR10MB2609.namprd10.prod.outlook.com>
	<[email protected]>

On Mon, 2026-03-23 at 14:47 +0100, Holger Jakobs wrote:
> > UPDATE pg_attribute SET atttypmod = (18 << 16 | 4) + 4 WHERE attrelid = 'table'::regclass  AND attname  = 'column';
> > 
> >   Is this approach considered safe from a data integrity
> >   perspective?
> 
> this change can lead to problems, because numbers with more than 16 digits before the decimal
> point wouldn't fit into the new data type.

Aww, right.
Goes to show how dangerous such operations are.

Yours,
Laurenz Albe

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