SUM and COUNT Quiz

SUM and COUNT QUIZ

bbc

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
...

1. 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'

2. 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

3. Select the full set of SQL aggregate functions

	AVG(), COUNT(), FIRST(), LAST(), SUM()
	AVG(), COUNT(), MAX(), MEDIAN(), MIN(), ROUND(), SUM()
	AVG(), COUNT(), FIRST(), LAST(), MAX(), MIN(), SUM()
	AVG(), COUNT(), MAX(), MIN(), SUM()
	COUNT(), SUM()

4. Select the result that would be obtained from the following code:SELECT region, SUM(area) FROM bbc WHERE SUM(area) > 15000000 GROUP BY region

Table-A

Europe

17000000

Table-B

Europe	17000000
Asia-Pacific	23460000
North America	21660000

Table-C

Europe

Asia-Pacific

North America

	Table-A
	Table-B
	Table-C
	No result due to invalid use of the GROUP BY function
	No result due to invalid use of the WHERE function

5. 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')

6. 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

7. 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)

8. Pick the result that would be obtained from the following code: SELECT region, SUM(area) FROM bbc GROUP BY region HAVING SUM(area)<= 20000000

Table-A

732240

13403102

17740392

4943771

Table-B

Africa	22550927
Asia-Pacific	28759578
Europe	23866987
North America	21660000

Table-C

Americas	732240
Middle East	13403102
South America	17740392
South Asia	4943771

Table-D

Africa	22550927
Americas	732240
Asia-Pacific	28759578
Europe	23866987
Middle East	13403102
North America	21660000
South America	17740392
South Asia	4943771

Table-E

Africa	false
Americas	true
Asia-Pacific	false
Europe	false
Middle East	true
North America	false
South America	false
South Asia	false

	Table-A
	Table-B
	Table-C
	Table-D
	Table-E

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