SUM and COUNT Quiz
From SQLZoo
Language: | English • 日本語 |
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SUM and COUNT 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 | |
... |
Select the statement that shows the sum of population of all countries in 'Europe'
SELECT name, population FROM bbc WHERE region = 'Europe'
SELECT population FROM bbc WHERE region = 'Europe' SUM BY region
SELECT SUM(population) FROM bbc WHERE region = 'Europe'
SELECT SUM(population FROM bbc WHERE region = 'Europe')
SUM population FROM bbc WHERE region = 'Europe'
Select the statement that shows the number of countries with population smaller than 150000
SELECT COUNT(name) FROM bbc WHERE population < 150000
SELECT COUNT(population < 150000) FROM bbc
SELECT name FROM bbc WHERE population < 150000
SELECT population AS COUNT FROM bbc WHERE population < 150000
SELECT SUM() FROM bbc WHERE population < 150000
Select the list of core SQL aggregate functions
AVG(), COUNT(), FIRST(), LAST(), SUM()
AVG(), COUNT(), MAX(), MEDIAN(), MIN(), ROUND(), SUM()
AVG(), COUNT(), CONCAT(), FIRST(), LAST(), MAX(), MIN(), SUM()
AVG(), COUNT(), MAX(), MIN(), SUM()
COUNT(), SUM()
Select the result that would be obtained from the following code:
SELECT region, SUM(area)
FROM bbc
WHERE SUM(area) > 15000000
GROUP BY region
Europe | 17000000 |
Europe | 17000000 |
Asia-Pacific | 23460000 |
North America | 21660000 |
Europe |
Asia-Pacific |
North America |
No result due to invalid use of the GROUP BY function
No result due to invalid use of the WHERE function
Select the statement that shows the average population of 'Poland', 'Germany' and 'Denmark'
SELECT AVG(population) FROM bbc WHERE name = ('Poland', 'Germany', 'Denmark')
SELECT AVG(population) FROM bbc WHERE name IN ('Poland', 'Germany', 'Denmark')
SELECT AVG(population) FROM bbc WHERE name LIKE ('Poland', 'Germany', 'Denmark')
SELECT AVG(population) FROM bbc WHERE name LIKE (Poland, Germany, Denmark)
SELECT population FROM bbc WHERE name IN ('Poland', 'Germany', 'Denmark')
Select the statement that shows the medium population density of each region
SELECT region, AVG(population/area) AS density FROM bbc
SELECT region, COUNT(population)/COUNT(area) AS density FROM bbc GROUP BY region
SELECT region, SUM(population)/COUNT(area) AS density FROM bbc GROUP BY region
SELECT region, SUM(population)/SUM(area) AS density FROM bbc HAVING region
SELECT region, SUM(population)/SUM(area) AS density FROM bbc GROUP BY region
Select the statement that shows the name and population density of the country with the largest population
SELECT name, density AS population/area FROM bbc WHERE population = MAX(population)
SELECT name, density AS population/area FROM bbc WHERE population = (SELECT MAX(population) FROM bbc)
SELECT name, MAX (population) FROM bbc WHERE population / (SELECT area FROM bbc)
SELECT name, population/area AS density FROM bbc WHERE population = (SELECT MAX(population) FROM bbc)
SELECT name, population/area AS density FROM bbc WHERE population > (SELECT MAX(population) FROM bbc)
Pick the result that would be obtained from the following code:
SELECT region, SUM(area)
FROM bbc
GROUP BY region
HAVING SUM(area)<= 20000000
732240 |
13403102 |
17740392 |
4943771 |
Africa | 22550927 |
Asia-Pacific | 28759578 |
Europe | 23866987 |
North America | 21660000 |
Africa |
Asia-Pacific |
Europe |
North America |
Americas | 732240 |
Middle East | 13403102 |
South America | 17740392 |
South Asia | 9437710 |
Americas |
Middle East |
South America |
South Asia |