SELECT Quiz/zh

一些關於基本SQL語句的問題

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
...

選擇產生此表的代碼。

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

選擇你會從這個代碼獲得的結果。

      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

選擇代碼以顯示以“A”或“L” 結束的國家。

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'

選擇查詢的結果。

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

這是world表格的開首數行記錄

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
...

選擇你會從這個代碼獲得的結果。

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

Andorra

234

Andorra

468

Andorra

936

Andorra

4680

Andorra	936
Albania	57456

選擇代碼以顯示面積大於50000，人口少過1000萬(10000000)的國家。

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

選擇代碼以顯示中國，澳大利亞，尼日利亞和法國的人口密度。

 
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')