Re: Join three fields into one on same table

On Mon, May 19, 2008 at 4:51 AM, jrivero  wrote:
> Hi, i need help for a query. I have three fields, year, month and day
> into table and need join and update another field named date on same
> table.
>
> My problem is not that make update query.
>
> With this query have the value of the update:
>> select year || '-' || month || '-' || day || ' 01:00:00' as newdate from table
>
> but this another query not have correct syntax...
>> 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)

Does that help?