Nested SELECT quiz
name | region | area | population | gdp |
---|---|---|---|---|
Afghanistan | South Asia | 652225 | 26000000 | |
Albania | Europe | 28728 | 3200000 | 6656000000 |
Algeria | Middle East | 2400000 | 32900000 | 75012000000 |
Andorra | Europe | 468 | 64000 | |
Bangladesh | South Asia | 143998 | 152600000 | 67144000000 |
United Kingdom | Europe | 242514 | 59600000 | 2022824000000 |
... |
1. Select the code that shows the name, region and population of the smallest country in each region
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)
2. Select the code that shows the countries belonging to regions with all populations over 50000
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)
3. Select the code that shows the countries with a less than a third of the population of the countries around it
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)
4. Select the result that would be obtained from the following code:
SELECT name FROM bbc
WHERE population >
(SELECT population
FROM bbc
WHERE name='United Kingdom')
AND region IN
(SELECT region
FROM bbc
WHERE name = 'United Kingdom')
Andorra |
Albania |
Austria |
Bulgaria |
France | Europe |
Germany | Europe |
Russia | Europe |
Turkey | Europe |
France |
Germany |
Andorra |
Albania |
France |
Germany |
Russia |
Turkey |
France |
Germany |
Russia |
Turkey |
Brazil |
United States of USA |
Canada |
5. Select the code that would show the countries with a greater GDP than any country in Africa (some countries may have NULL gdp values).
SELECT name FROM bbc
WHERE gdp > ALL (SELECT MAX(gdp) FROM bbc WHERE region = 'Africa' AND gdp=0)
SELECT name FROM bbc
WHERE gdp > (SELECT MAX(gdp) FROM bbc WHERE region = 'Africa')
SELECT name FROM bbc
WHERE gdp > ALL (SELECT MIN(gdp) FROM bbc WHERE region = 'Africa')
SELECT name FROM bbc
WHERE gdp > ALL (SELECT gdp FROM bbc WHERE region = 'Africa')
SELECT name FROM bbc
WHERE gdp > ALL (SELECT gdp FROM bbc WHERE region = 'Africa' AND gdp<>NULL)
6. Select the code that shows the countries with population smaller than Russia but bigger than Denmark
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')
7. >Select the result that would be obtained from the following code:
SELECT name FROM bbc
WHERE population > ALL
(SELECT MAX(population)
FROM bbc
WHERE region = 'Europe')
AND region = 'South Asia'
Afghanistan |
Bhutan |
Nepal |
Sri Lanka |
The Maldives |
Bangladesh |
India |
Pakistan |
China |
India |
Brazil |
Bangladesh |
China |
India |
France |
Germany |
Russia |
Trukey |