Mysql-131536

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;

_다중 group by텍스트_
여러개의 col들을 한번에 묶어 분류할 때 사용
ex)group by col1,col2....