select
country_olympic_name,
SUM(part_gold) as ‘Number of Gold Medals’
From
games.country,
games.participation
where
participation.country_isocode = country.country_isocode
group by
country_olympic_name;

我一直收到错误ORA-00923：FROM关键字未在预期位置找到，并且不知道为什么，请帮助