Question

I have two tables

order [ order_id ]
order_line [ order_id, product_id, cat_id ]

I want to select every order & associated order_line,
but I want row per order, and i only want to select cat_id from order_line

so i want a result like this..

results:
[0] order_id, cat_id1 , cat_id2, cat_id3
[1] order_id, cat_id

Possible?

Answer 1

this is based on the answer to my own question

CREATE FUNCTION [dbo].[GetCateogriesForOrder]
(
    @orderID int
)
RETURNS varchar(max)
AS
BEGIN
    declare @output varchar(max)
    select @output = COALESCE(@output + ', ', '') + cat_id
    from order_line
    where order_id = @orderID

    return @output
END

GO

SELECT order_ID, dbo. GetCateogriesForOrder(order_ID)
FROM order 

GO