Nested SELECT Quiz

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Nested SELECT quiz <quiz shuffle=none display=simple> {Which of these shows the name, region and population of the smallest country in each region? |type="()"} - SELECT region, name, FROM bbc x WHERE population <= ALL (SELECT population FROM bbc y WHERE y.region=x.region AND population>0) - SELECT region, name, population FROM bbc WHERE population <= ALL (SELECT population FROM bbc WHERE population>0) + SELECT region, name, population FROM bbc x WHERE population <= ALL (SELECT population FROM bbc y WHERE y.region=x.region AND population>0) - SELECT region, name, population FROM bbc x WHERE population = ALL (SELECT population FROM bbc y WHERE y.region=x.region AND population>0) - SELECT region, name, population FROM bbc x WHERE population <= ALL (SELECT population FROM bbc y WHERE y.region=x.region AND population<0)

{Which of these shows the countries belonging to regions with all populations over 50000? |type="()"} - SELECT name,region,population FROM bbc x WHERE 50000 <= ALL (SELECT population FROM bbc y WHERE population>0) + SELECT name,region,population FROM bbc x WHERE 50000 <= ALL (SELECT population FROM bbc y WHERE x.region=y.region AND y.population>0) - SELECT name,region,population FROM bbc x WHERE 50000 = ALL (SELECT population FROM bbc y WHERE x.region=y.region AND y.population>0) - SELECT name,region,population FROM bbc x WHERE 50000 >= ALL (SELECT population FROM bbc y WHERE x.region=y.region AND y.population>0) - SELECT name,region,population FROM bbc x WHERE 500000 <= ALL (SELECT population FROM bbc y WHERE x.region=y.region AND y.population>0)


{Which of these shows the countries with a third of the population of the countries around it? |type="()"} + SELECT name, region FROM bbc x WHERE population < ALL (SELECT population/3 FROM bbc y WHERE y.region = x.region AND y.name != x.name) - SELECT name, region FROM bbc x WHERE population = ALL (SELECT population/3 FROM bbc y WHERE y.region = x.region AND y.name != x.name) - SELECT name, region FROM bbc x WHERE population > ALL (SELECT population/3 FROM bbc y WHERE y.region = x.region AND y.name != x.name) - SELECT name, region FROM bbc x WHERE population < ALL (SELECT population*3 FROM bbc y WHERE y.region = x.region AND y.name != x.name) - SELECT name, region FROM bbc x WHERE population < ALL (SELECT population/3 FROM bbc y WHERE y.name != x.name)

{Which of these would show the countries with a greater GDP then any country in Africa? |type="()"} - SELECT name FROM bbc WHERE gdp > ALL (SELECT MAX(gdp) FROM bbc WHERE region = 'Africa' AND gdp=0) + SELECT name FROM bbc WHERE gdp > ALL (SELECT MAX(gdp) FROM bbc WHERE region = 'Africa' AND gdp IS NOT NULL) - SELECT name FROM bbc WHERE gdp > ALL (SELECT MIN(gdp) FROM bbc WHERE region = 'Africa' AND gdp IS NOT NULL) - SELECT name FROM bbc WHERE gdp > ALL (SELECT MAX(gdp) FROM bbc WHERE region = 'Africa' AND population IS NOT NULL) - SELECT name FROM bbc WHERE gdp > ALL (SELECT MAX(gdp) FROM bbc WHERE region = 'Europe' AND gdp IS NOT NULL)

{Which of these shows the countries with population smaller than Russia but bigger than Denmark? |type="()"} - SELECT name FROM bbc WHERE population < (SELECT population FROM bbc WHERE name='Denmark') AND population > (SELECT population FROM bbc WHERE name='Russia') + SELECT name FROM bbc WHERE population < (SELECT population FROM bbc WHERE name='Russia') AND population > (SELECT population FROM bbc WHERE name='Denmark') - SELECT name FROM bbc WHERE population = (SELECT population FROM bbc WHERE name='Russia') AND population > (SELECT population FROM bbc WHERE name='Denmark') - SELECT name FROM bbc WHERE population > (SELECT population FROM bbc WHERE name='Russia') AND population > (SELECT population FROM bbc WHERE name='Denmark') - SELECT name FROM bbc WHERE population < (SELECT population FROM bbc WHERE name='Russia' AND population > (SELECT population FROM bbc WHERE name='Denmark') </quiz>