Re: Join three fields into one on same table - Mailing list pgsql-general

On Mon, May 19, 2008 at 03:36:39PM -0600, Scott Marlowe wrote:
> On Mon, May 19, 2008 at 4:51 AM, jrivero <godsea@gmail.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;

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