Re: altering a column to to make it generated

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(dot)klaver(at)aklaver(dot)com