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CREATE TABLE store (
`order` int,
item varchar(30),
discount varchar(30)
);
INSERT INTO store VALUES
(11, 'item1', 'PROMO'),
(11, 'item1', 'PROMO'),
(11, 'item1', 'MARKDOWN'),
(11, 'item1', 'PROMO'),
(11, 'item2', null),
(11, 'item2', 'MARKDOWM'),
(11, 'item2', null),
(33, 'item1', 'PROMO'),
(33, 'item1', 'PROMO'),
(33, 'item1', 'PROMO');
SELECT `order`, item
FROM store
GROUP BY `order`, item
HAVING MIN(discount) = 'PROMO' AND MAX(discount) = 'PROMO'
;
select `order`, item, count(discount)
from store
group by `order`, item
having count(discount) = count(case when discount='PROMO' then 1 end)
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