楼主的问法有问题,楼上两位的回答是符合你所说的情况的。
我感觉你是要查询国家总人口不少于1亿的国家里的所有地区
如果是这样,这样写
select region from bbc where name in(select name from bbc group by name having sum(population)>=100000000)
如果不是这样,请说明你到底要什么……
select * from bbc where population>=100000000
如果只要地区
select 地区 from bbc where population>=100000000
select region,sum(population) from bbc group by region having sum(population) >=100000000
select region from bbc where population >= 100000000