average-population-of-each-continent

最新推荐文章于 2025-12-05 17:00:14 发布

原创最新推荐文章于 2025-12-05 17:00:14 发布 · 237 阅读

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该博客探讨了一道SQL题目，涉及对CITY和COUNTRY表的联合查询，目的是查询每个大陆的名称及其平均城市人口（四舍五入到最接近的整数）。输入格式和答案示例也给出了具体的查询语句。内容侧重于SQL的联查操作和数据聚合函数的应用。

题目如下：

这道题主要考联合查询。

Given the CITY and COUNTRY tables, query the names of all the continents (COUNTRY.Continent) and their respective average city populations (CITY.Population) rounded down to the nearest integer.

Note: CITY.CountryCode and COUNTRY.Code are matching key columns.

Input Format

答案如下：

SELECT SON,PARENT ,c.p FROM (SELECT A.N as son ,B.N as parent FROM BST A RIGHT JOIN BST B on A.P=B.N)
tmp  join BST C ON tmp.parent =c.n

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