有没有其他的方法来写这个查询?替代查询
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)
在此先感谢
只删除外部'SELECT * FROM'子句。 –