使用sql group by和having

Question

我对SQL很陌生，我正在尝试回答SQL ZOO的练习8，但我遗漏了一些东西。你能帮我吗？

List the continents that have a total population of at least 100 million.

我正在尝试的是：

select continent
from world
group by continent 
having count(population) >= 100000000

Answer 1

您的错误是使用COUNT而不是SUM。

尝试以下方法：

select continent
from world
group by continent
having sum(population) >= 100000000

Answer 2

SELECT continent, SUM(population) AS 'total population'
  FROM world
  GROUP BY continent
  HAVING SUM(population) >= 500000000

Answer 3

SELECT continent
FROM world
GROUP BY continent
HAVING SUM(population) >= 100000000

请试试这个块