Re: order by question

On Fri, Jun 19, 2009 at 10:46 PM, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>wrote:

> On Fri, Jun 19, 2009 at 7:32 PM, Tony Liao<tonyliao(at)yuehetone(dot)com> wrote:
> > Thanks,All,
> > To Tino,I want to order by IN condition "(6,3,4,10,7)".
> > To Sergio,my answer is "Yes".
> > To Kenny,I think this is not the result I want to get.
> > To Scott,In database,there are thousands of products.the select
> > query is generated by application,and it is not sure how many product_id
> > in condition,maybe the next query would be .........product_id in
> > (4,26,7,8,9,23,27,54)
>
> If you generate the product_id in (4,26,7,8,9,23,27,54) part then
> it's pretty easy to create the order by case part too.
>
> I agree with Scott, if your application generate IN condition, could create
CASE too, looks like this

SELECT id, product_id FROM your_table
WHERE product_id IN (6, 3, 4, 10, 7)
ORDER BY
CASE
WHEN product_id = 6 THEN 1
WHEN product_id = 3 THEN 2
WHEN product_id = 4 THEN 3
WHEN product_id = 10 THEN 4
WHEN product_id = 7 THEN 5
END;

Regards,

Sergio Gabriel Rodriguez
http://www.3trex.com.ar