๋ฐ์ํ
https://school.programmers.co.kr/learn/courses/30/lessons/131536
-- ์ฝ๋๋ฅผ ์
๋ ฅํ์ธ์
SELECT USER_ID, PRODUCT_ID
from ONLINE_SALE
group by USER_ID, PRODUCT_ID
having count(*) >= 2
order by USER_ID asc, PRODUCT_ID desc
๋ฐ์ํ