1.

Show the total population of the world.

SELECT SUM(population)
FROM world

2.

List all the continents - just once each.

SELECT DISTINCT continent
FROM world

Give the total GDP of Africa

SELECT SUM(gdp)
FROM world
WHERE continent='Africa'

How many countries have an area of at least 1000000

SELECT COUNT(name)
FROM world
WHERE area >= 1000000

What is the total population of ('Estonia', 'Latvia', 'Lithuania')

SELECT SUM(population) 
FROM world
WHERE name IN ('Estonia', 'Latvia', 'Lithuania')

For each continent show the continent and number of countries.

SELECT continent,COUNT(name)
FROM world
GROUP BY continent

For each continent show the continent and number of countries with populations of at least 10 million.

SELECT continent,COUNT(name)
FROM world
WHERE population >= 10000000
GROUP BY continent

List the continents that have a total population of at least 100 million.

SELECT continent
FROM world
GROUP BY continent HAVING SUM(population)>= 100000000

©著作权归作者所有,转载或内容合作请联系作者
【社区内容提示】社区部分内容疑似由AI辅助生成，浏览时请结合常识与多方信息审慎甄别。
平台声明：文章内容（如有图片或视频亦包括在内）由作者上传并发布，文章内容仅代表作者本人观点，简书系信息发布平台，仅提供信息存储服务。