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SELECT within SELECT

name continent area population gdp
Afghanistan Asia 652230 25500100 20343000000
Albania Europe 28748 2831741 12960000000
Algeria Africa 2381741 37100000 188681000000
Andorra Europe 468 78115 3712000000
Angola Africa 1246700 20609294 100990000000
...
  1. Bigger than Russia
SELECT name FROM world
  WHERE population >
     (SELECT population FROM world
      WHERE name='Russia')
  1. Show the countries in Europe with a per capita GDP greater than 'United Kingdom'.
SELECT name FROM world
  WHERE continent = 'Europe'
    and GDP/population >
     (SELECT GDP/population FROM world
      WHERE name='United Kingdom')
  1. List the name and continent of countries in the continents containing either Argentina or Australia. Order by name of the country.
SELECT name, continent FROM world
  WHERE continent in 
     (SELECT continent FROM world
      WHERE name ='Argentina' or name ='Australia')
  1. Which country has a population that is more than Canada but less than Poland? Show the name and the population.
SELECT name, population FROM world
  WHERE population > 
     (SELECT population FROM world
      WHERE name ='Canada') and population < (SELECT population FROM world
      WHERE name ='Poland')
  1. Germany (population 80 million) has the largest population of the countries in Europe. Austria (population 8.5 million) has 11% of the population of Germany.

Show the name and the population of each country in Europe. Show the population as a percentage of the population of Germany.

SELECT  name, CONCAT(ROUND(population * 100/(SELECT population FROM world WHERE name = 'Germany'),0), '%')
FROM world
WHERE continent = 'Europe'
  1. Which countries have a GDP greater than every country in Europe? [Give the name only.] (Some countries may have NULL gdp values)
SELECT name
FROM world
WHERE gdp >= ALL(SELECT gdp FROM world WHERE gdp >=0 AND continent = 'Europe') AND continent != 'Europe'
  1. Largest in each continent
SELECT continent, name, area FROM world x
  WHERE area >= ALL
    (SELECT area FROM world y
        WHERE y.continent=x.continent
          AND area>0)

8.List each continent and the name of the country that comes first alphabetically.

SELECT continent, name
FROM world x
WHERE name <= ALL(SELECT name FROM world y WHERE y.continent = x.continent)

9.Find the continents where all countries have a population <= 25000000. Then find the names of the countries associated with these continents. Show name, continent and population.

SELECT name, continent, population
FROM world x
WHERE 25000000  > ALL(SELECT population FROM world y WHERE x.continent = y.continent AND y.population > 0)

10.Some countries have populations more than three times that of any of their neighbours (in the same continent). Give the countries and continents.

SELECT name, continent
FROM world x
WHERE population > ALL(SELECT population*3 FROM world y WHERE x.continent = y.continent AND population > 0 AND y.name != x.name)