【sql】统计大国 Big Countries

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原文链接：https://my.oschina.net/liyurong/blog/1605911

本文提供了一个SQL解决方案，用于从一个包含国家名称、大陆、面积、人口和GDP的表格中筛选出面积大于3百万平方公里或者人口超过2500万的大国。

为什么80%的码农都做不了架构师？>>>

问题：

There is a table World

+-----------------+------------+------------+--------------+---------------+
| name            | continent  | area       | population   | gdp           |
+-----------------+------------+------------+--------------+---------------+
| Afghanistan     | Asia       | 652230     | 25500100     | 20343000      |
| Albania         | Europe     | 28748      | 2831741      | 12960000      |
| Algeria         | Africa     | 2381741    | 37100000     | 188681000     |
| Andorra         | Europe     | 468        | 78115        | 3712000       |
| Angola          | Africa     | 1246700    | 20609294     | 100990000     |
+-----------------+------------+------------+--------------+---------------+

A country is big if it has an area of bigger than 3 million square km or a population of more than 25 million.

Write a SQL solution to output big countries' name, population and area.

For example, according to the above table, we should output:

+--------------+-------------+--------------+
| name         | population  | area         |
+--------------+-------------+--------------+
| Afghanistan  | 25500100    | 652230       |
| Algeria      | 37100000    | 2381741      |
+--------------+-------------+--------------+

解决：

① 3772ms

SELECT name,population,area
FROM World
WHERE area > 3000000 OR population > 25000000

转载于:https://my.oschina.net/liyurong/blog/1605911