Re: copy old column's values to new column

On Thu, Sep 02, 2004 at 06:16:47 -0700,
ogjunk-pgjedan(at)yahoo(dot)com wrote:
> Hello,
>
> I need some basic SQL help. I added a new column to an existing table,
> and now I need to copy values from one of the old columns to this new
> columns.
>
> I need something like this:
>
> FOR pvId IN SELECT id FROM preference_value LOOP
> update preference_value SET display_value = (select value from
> preference_value where id=pvId) where id=pvId;
> END LOOP;
>
> I tried running this from psql, but it didn't work (I suspect FOR can
> be used in functions, which I don't know how to write in PG, yet).
>
> Is there a simple way to do this?

Assuming you are just copying "value" to "display_value", can't you just do:

UPDATE preference_value SET display_value = value;