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Date: Mon, 22 Apr 2024 13:01:04 -0700
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Subject: Re: altering a column to to make it generated
To: Celia McInnis <celia.mcinnis@gmail.com>,
 "pgsql-generallists.postgresql.org" <pgsql-general@lists.postgresql.org>
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From: Adrian Klaver <adrian.klaver@aklaver.com>
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On 4/22/24 12:42, Celia McInnis wrote:
> Can I alter a table column to now make it generated? I tried this 
> unsuccessfully:
> 
> create temp table tmp1 as select 15::numeric(6,1) as 
> distance,'24:30'::interval,0::numeric(7,3) as avgspd;
> alter table tmp1 alter column avgspd type numeric(7,3) generated always 
> as ((3600.*distance)/EXTRACT (EPOCH FROM rdrtime::interval)) STORED;
> ERROR:  syntax error at or near "generated"
> LINE 1: ... table tmp1 alter column avgspd type numeric(7,3) generated ...
> 
> I think that at least I have the right bracketing this time! :-) 

See David Johnston's comment. I keep on wanting to believe that ALTER 
TABLE supports GENERATED expressions, when it only supports GENERATED 
IDENTITY:)

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> 

-- 
Adrian Klaver
adrian.klaver@aklaver.com