[LeetCode] 595. Big Countries

最新推荐文章于 2025-04-29 12:29:58 发布

lizzy05

最新推荐文章于 2025-04-29 12:29:58 发布

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此篇博客介绍如何使用SQL查询从World表中筛选出人口超过2500万或面积大于300万平方公里的大国，包括名称、人口和面积数据。解决方案展示了如何在MySQL中快速高效地筛选出这些关键信息。

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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.

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     |
+-----------------+------------+------------+--------------+---------------+

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

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

Solution:

select name, population, area from World where population > 25000000 or area > 3000000;

Runtime: 285 ms, faster than 57.57% of MySQL online submissions for Big Countries.

Memory Usage: 0B, less than 100.00% of MySQL online submissions for Big Countries.