有沒有其他的方法來寫這個查詢?替代查詢
select
*
from
(select
countries.country_name, sum(profits.amount_sold)
from
PROFITS
full outer join
CUSTOMERS on PROFITS.CUST_ID = CUSTOMERS.CUST_ID
full outer join
COUNTRIES on CUSTOMERS.COUNTRY_ID = COUNTRIES.COUNTRY_ID
WHERE
COUNTRY_NAME = 'Japan'
group by
countries.country_name)
在此先感謝
只刪除外部'SELECT * FROM'子句。 –