问题1：
我想用groupby但是不想用到聚合
函数，有办法吗？
具体问题如下：
有表aaa
FruitNameCountryPrice
apple china 1
banana china 2
orange china 3
apple japan 2
cherry japan 5
要求：列出每个国家价格大于3的水果的信息
select*
fromaaa
groupbycountry
havingprice>=3
我这样写是不对的，因为用了groupby，所以select后面必须用聚合
函数，但我这里没必要这么用啊，怎么办？
问题2：
是不是having后面也要用聚合
函数才行啊
问题3：
我这么写为什么也不对啊
selectcount(fruitname)asMycount
fromaaa
groupbycountry
whereprice>=2
在PL/
sql下做的。
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