Total world population

Show the total population of the world.

SELECT SUM(population)
FROM world

List of continents

List all the continents - just once each.

SELECT DISTINCT continent FROM world

GDP of Africa

Give the total GDP of Africa

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

Count the big countries

How many countries have an area of at least 1000000

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

Baltic states population

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

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

Counting the countries of each continent

For each continent show the continent and number of countries.

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

Counting big countries in each 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

Counting big continents

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

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