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From: Tom Lane <[email protected]>
To: David G. Johnston <[email protected]>
Cc: Celia McInnis <[email protected]>
Cc: pgsql-generallists.postgresql.org <[email protected]>
Subject: Re: altering a column to to make it generated
Date: Mon, 22 Apr 2024 16:11:43 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAKFQuwb5i7nW+QcYfpCb2=SnXyURsGXd3_YwEBw61HuB4muv2g@mail.gmail.com>
References: <CAGD6t7L68jXK6jOLHhyRijSE1y-Y_pic9RZaNyBG+-QY4pa=6Q@mail.gmail.com>
	<CAKFQuwb5i7nW+QcYfpCb2=SnXyURsGXd3_YwEBw61HuB4muv2g@mail.gmail.com>

"David G. Johnston" <[email protected]> writes:
> On Mon, Apr 22, 2024 at 12:42 PM Celia McInnis <[email protected]>
> wrote:
>> Can I alter a table column to now make it generated? I tried this
>> unsuccessfully:

> I looked at all of the "alter table ... alter column" commands listed here:
> https://www.postgresql.org/docs/current/sql-altertable.html
> And none seem to involve the generated expression column.  So the answer is
> no.

I think what you'd need to do is drop the existing column
and then add a generated column.

			regards, tom lane

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