Re: Join three fields into one on same table

On Tue, May 20, 2008 at 5:34 AM, Sam Mason <sam(at)samason(dot)me(dot)uk> wrote:

> On Mon, May 19, 2008 at 03:36:39PM -0600, Scott Marlowe wrote:
> > On Mon, May 19, 2008 at 4:51 AM, jrivero <godsea(at)gmail(dot)com> wrote:
> > > My problem is not that make update query.
> > >
> > >> update table set date=(select year || '-' || month || '-' || day || '
> 01:00:00' as newdate from table)
> >
> > Cast the output of those concatenations to date:
> >
> > update table set date=(select (year || '-' || month || '-' || day || '
> > 01:00:00')::date as newdate from table)
>
> I'd guess the OP doesn't want the sub-query, if he posted the error
> message we'd know for sure. I'd guess something like:
>
> update table set date=(year||'-'||month||'-'||day||'01:00:00')::date;

That'd be my guess too. OP's subquery is possibly returning more than one
row, and hence an error.

>
> If the "date" column really is of date type, then the final
> "||'01:00:00'" is somewhat superfluous.
>

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