Re: Sort of Complex Query - Howto Eliminate Repeating Results - Mailing list pgsql-novice

On Thu, Jan 12, 2006 at 12:07:12PM -0800, operationsengineer1@yahoo.com wrote:
> SELECT DISTINCT t_product.product_id,
>        t_product.product_number,
>        t_serial_number.serial_number_id,
>        t_serial_number.serial_number
[...]
> ORDER BY t_serial_number.serial_number::int ASC
>
> resulting error:
>
> ERROR:  for SELECT DISTINCT, ORDER BY expressions must
> appear in select list

What data type is serial_number?  I'm guessing not integer, else
you wouldn't be casting it to integer in the ORDER BY clause.  If
you need that cast then also use it in the SELECT list:

SELECT DISTINCT t_product.product_id,
       t_product.product_number,
       t_serial_number.serial_number_id,
       t_serial_number.serial_number::int

--
Michael Fuhr