SELECT Quiz/ja

SQLの基本構文の確認テスト

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
...

このテーブルを表示するコードを選ぶ。

name	population
Bahrain	1234571
Swaziland	1220000
Timor-Leste	1066409

FROM world
SELECT name, population BETWEEN 1000000 AND 1250000

FROM name, population 
WHERE population BETWEEN 1000000 AND 1250000
SELECT world

SELECT name, population
  FROM world
 WHERE population BETWEEN 1000000 AND 1250000

SELECT population BETWEEN 1000000 AND 1250000
FROM world

WHERE population BETWEEN 1000000 AND 1250000
SELECT name, population FROM world

このコードの出力結果を選ぶ:

      SELECT name, population
      FROM world
      WHERE name LIKE "Al%"

Table-A

Albania

Algeria

Table-B

%bania	3200000
%geria	32900000

Table-C

Al

0

Table-D

Albania

3200000

Table-E

Albania	3200000
Algeria	32900000

A または L で終わる国名を表示するコードを選ぶ。

SELECT name FROM world
 WHERE name LIKE 'a%' AND name LIKE 'l%'

 
SELECT name FROM world
 WHERE name LIKE 'a%' OR name LIKE 'l%'

 
SELECT name FROM world
 WHERE name LIKE '%a' AND name LIKE '%l'

 
SELECT name FROM world
 WHERE name LIKE '%a' OR 'l%'

SELECT name FROM world
 WHERE name LIKE '%a' OR name LIKE '%l'

このクエリーの出力結果を選ぶ。

SELECT name,length(name)
FROM world
WHERE length(name)=5 and region='Europe'

name	length(name)
Benin	5
Lybia	5
Egypt	5

name	length(name)
Italy	5
Egypt	5
Spain	5

name	length(name)
Italy	5
Malta	5
Spain	5

name	length(name)
Italy	5
France	6
Spain	5

name	length(name)
Sweden	6
Norway	6
Poland	6

これは world テーブルの最初の数行:

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
...

このコードから得られる結果を選ぶ:

SELECT name, area*2 FROM world WHERE population = 64000

Andorra

234

Andorra

468

Andorra

936

Andorra

4680

Andorra	936
Albania	57456

面積が50000を超えかつ人口が10000000未満の国を表示するコードを選ぶ。

SELECT name, area, population
  FROM world
 WHERE area < 50000 AND population < 10000000

SELECT name, area, population
  FROM world
 WHERE area < 50000 AND population > 10000000

SELECT name, area, population
  FROM world
 WHERE area > 50000 AND population < 10000000

SELECT name, area, population
  FROM world
 WHERE area > 50000 AND population > 10000000

 
SELECT name, area, population
  FROM world
 WHERE area = 50000 AND population = 10000000

China, Australia, Nigeria, France の人口密度を表示するコードを選ぶ。

 
SELECT name, area/population
FROM world WHERE name IN ('China', 'Nigeria', 'France', 'Australia')

SELECT name, area/population
FROM world WHERE name LIKE ('China', 'Nigeria', 'France', 'Australia')

SELECT name, population/area
  FROM world
 WHERE name IN ('China', 'Nigeria', 'France', 'Australia')

SELECT name, population/area
  FROM world
 WHERE name LIKE ('China', 'Nigeria', 'France', 'Australia')

SELECT name, population
  FROM world
 WHERE name IN ('China', 'Nigeria', 'France', 'Australia')