SUM and COUNT Quiz/ja

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SUM と COUNT クイズ

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
...

ヨーロッパの全ての国の人口を集計する文を選べ

 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'

150000人よりも少ない人口の国の数を表示する文を選べ

 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

SQL の主要な集計関数のリストを選べ

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()

次のコードの実行結果を選べ:

 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

GROUP BY の用法が正しくないため結果は無し

WHERE の用法が正しくないため結果は無し

'Poland', 'Germany', 'Denmark' の人口の平均を表示するコードを選べ

 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')

各地域の地域と人口密度を表示するコードを選べ

 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

人口が最大の国の国名と人口密度を表示するコードを選べ

 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)

次のコードの実行結果を選べ:

 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

Africa

Asia-Pacific

Europe

North America

Table-D

Americas	732240
Middle East	13403102
South America	17740392
South Asia	9437710

Table-E

Americas

Middle East

South America

South Asia