SQL架構

1 Create table If Not Exists World (name varchar(255), continent varchar(255), area int, population int, gdp int)
2 Truncate table World
3 insert into World (name, continent, area, population, gdp) values (‘Afghanistan‘, ‘Asia‘, ‘652230‘, ‘25500100‘, ‘20343000000‘)
4 insert into World (name, continent, area, population, gdp) values (‘
 
Albania‘, ‘Europe‘, ‘28748‘, ‘2831741‘, ‘12960000000‘)
5 insert into World (name, continent, area, population, gdp) values (‘Algeria‘, ‘Africa‘, ‘2381741‘, ‘37100000‘, ‘188681000000‘)
6 insert into World (name, continent, area, population, gdp) values (‘Andorra‘, ‘Europe‘, ‘468‘, ‘78115‘, ‘3712000000‘)
7 insert into World (name, continent, area, population, gdp) values (‘
 
Angola‘, ‘Africa‘, ‘1246700‘, ‘20609294‘, ‘100990000000‘)

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

這裏有張 World 表

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

如果一個國家的面積超過300萬平方公裏，或者人口超過2500萬，那麽這個國家就是大國家。

編寫一個SQL查詢，輸出表中所有大國家的名稱、人口和面積。

例如，根據上表，我們應該輸出:

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

1613ms

1 # Write your MySQL query statement below
2 select 
3     a.name, a.population, a.area
4 from 
5     world as a
6 where 
7     a.area > 3000000 or a.population > 25000000

1627ms

1 # Write your MySQL query statement below
2 select w.name, w.population, w.area
3 from World w
4 where w.area > 3000000 or
5       w.population > 25000000;  

[SQL]LeetCode595. 大的國家 | Big Countries