SUM and COUNT Quiz/ja
Language: | English • 日本語 |
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SUM と COUNT クイズ
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
Europe | 17000000 |
Europe | 17000000 |
Asia-Pacific | 23460000 |
North America | 21660000 |
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
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 |