MySQL-UNION和ORDER / SORT行

Question

I am retrieving table result/s using MySQL's UNION feature. The table is basically containing ordered items from a sales order

Below is the query that i Used:

SET @meta_id=0; 
SELECT bsb.ID AS meta_id, bsb.ORDER_ID AS order_item_id, '_product_id' AS meta_key, bsb.PRODUCT_ID AS meta_value, 1 AS origin
FROM b_sale_basket bsb
WHERE bsb.ORDER_ID = 255
UNION
SELECT bsb.ID AS meta_id, bsb.ORDER_ID AS order_item_id, '_qty' AS meta_key, bsb.QUANTITY AS meta_value, 2 AS origin
FROM b_sale_basket bsb
WHERE bsb.ORDER_ID = 255
) sales_order_meta 

The first query above retrieves ordered products having an order_item_id of 255
while
The second query above retrieves the quantity of each product ordered

Side Note : In case you ask why I query them this way since they all belong in the same table, it is because I'm trying to retrieve it like woocommerce does to its ordered items...

The output of the query above looks like this:

http://i.stack.imgur.com/qPsjv.png

But, I wish to order the results so that below each product ordered there is a quantity of each product ordered below them..

The Final result that I want, looks like this: http://i.stack.imgur.com/wx6Aw.png

Kindly Please help me...

Answer 1

You can use a user-defined variable to give a rank for each individual query so first row query 1 will have a rank of 1 and similarly first row of second query will have a rank of 1 and then 2 ,3 so on and then order your result by this row number

SELECT bsb.ID AS meta_id, bsb.ORDER_ID AS order_item_id, '_product_id' AS meta_key, bsb.PRODUCT_ID AS meta_value, 1 AS origin
,@r:= @r +1 AS `row`
FROM b_sale_basket bsb,(SELECT @r:=0) t
WHERE bsb.ORDER_ID = 255
UNION
SELECT bsb.ID AS meta_id, bsb.ORDER_ID AS order_item_id, '_qty' AS meta_key, bsb.QUANTITY AS meta_value, 2 AS origin
,@r:= @r +1 AS `row`
FROM b_sale_basket bsb,(SELECT @r:=0) t
WHERE bsb.ORDER_ID = 255
ORDER BY `row`

Edit

You can also try ORDER BY order_item_id,meta_key