SUM and COUNT Quiz/ja

From SQLZOO
Jump to: navigation, search
Language:Project:Language policy English  • 日本語

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
Europe17000000
Table-B
Europe17000000
Asia-Pacific23460000
North America21660000
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
Africa22550927
Asia-Pacific28759578
Europe23866987
North America21660000
Table-C
Africa
Asia-Pacific
Europe
North America
Table-D
Americas732240
Middle East13403102
South America17740392
South Asia9437710
Table-E
Americas
Middle East
South America
South Asia