帮助形成SQL语句

Question

我有两张桌子：景点和城市。景点包含一个名为city的列，它是对cities表中id的引用。我想形成一个MySQL语句，告诉我哪些城市的吸引力最大。

我知道我能做到：

SELECT COUNT(*) as `number` 
 FROM `attractions` 
WHERE `city` = XX 

...要计算一个城市中有多少景点，但是有一个声明可以计算每个城市的所有景点，并按景点数量的降序返回结果吗？

Answer 1

SELECT City.Name, COUNT(Attractions.City) as AttractionCount
FROM City
LEFT OUTER JOIN Attractions ON City.City = Attractions.City
GROUP BY City.Name
ORDER BY COUNT(Attractions.City) DESC