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create table product_attributes (`id` int, `product_id` int, `product_name` varchar(3), `size` varchar(2), `stock` int) ; insert into product_attributes (`id`, `product_id`, `product_name`, `size`, `stock`) values (1, 1, 'XYZ', 'S', 2), (2, 1, 'XYZ', 'M', 0), (3, 1, 'XYZ', 'L', 3), (7, 1, 'XYZ', 'XL', 3), (4, 2, 'ABC', 'S', 1), (5, 2, 'ABC', 'M', 1), (6, 2, 'ABC', 'L', 1) ;
select product_id, product_name from product_attributes where `size` in ('S','M','L') group by product_id,product_name order by count(case when stock <> 0 then 1 end) desc
product_id
product_name
2
ABC
1
XYZ