1 數(shù)據(jù)集介紹

在線運行：

https://sqlzoo.net/wiki/SELECT_basics

2 練習題

2.1 知識儲備

• 字符串需要使用單引號
• 使用in可以檢查某一項是否位于某個列表內(nèi)
• 使用between XXX and XXX可以檢查某一項是否位于某個范圍內(nèi)

2.2 練習

show the population of Germany

select population from world where name = 'Germany';

Show the name and the population for ‘Sweden’, ‘Norway’ and ‘Denmark’.

select name,population from world where name in ('Sweden','Norway','Denmark');

show the country and the area for countries with an area between 200,000 and 250,000

select name,area from world where area between 200000 and 250000;

3 十三道和world表關聯(lián)的sql語句

https://sqlzoo.net/wiki/SELECT_from_WORLD_Tutorial

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SELECT name, continent, population FROM world

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select name from world where population > 200000000;

3

select name, gdp/population from world where population > 200000000;

4

select name,population/1000000 from world where continent = 'South America';

5

select name,population from world where name in ('France','Germany','Italy');

6

select name from world where name like '%United%';

7

select name,population,area from world where area > 3000000 or population > 250000000;

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select name,population,area from world where area > 3000000 and population < 250000000 or area < 3000000 and population > 250000000;

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select name,round(population/1000000,2),round(gdp/1000000000,2) from world where continent = 'South America';

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select name,round(gdp/population,-3) from world where gdp > 1000000000000;

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SELECT name,capital FROM world WHERE LEN(name)=LEN(capital)

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select name,capital from world where left(name,1) = left (capital,1) and name <> capital;

13

select name from world where name like '%a%' and name like '%e%' and name like '%i%' and name like '%o%' and name like '%u%' and name not like '% %';

4 十四道和nobel表關聯(lián)的sql語句

https://sqlzoo.net/wiki/SELECT_from_Nobel_Tutorial

1

select * from nobel where yr=1950;

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SELECT winnerFROM nobelWHERE yr = 1962AND subject = 'literature'

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select yr,subject from nobel where winner='Albert Einstein'

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select winner from nobel where yr >= 2000 and subject = 'peace';

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select * from nobel where yr between 1980 and 1989 and subject = 'literature'

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select * from nobel where winner in ('Theodore Roosevelt','Woodrow Wilson','Jimmy Carter','Barack Obama');

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select winner from nobel where winner like 'John%';

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select yr,subject,winner from nobel where (yr=1980 and subject='physics') or (yr=1984 and subject='chemistry')

9

select yr,subject,winner from nobel where yr=1980 and subject not in ('chemistry');

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select yr,subject,winner from nobel where (subject='Medicine' and yr < 1910) or (subject='Literature' and yr>=2004)

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select * from nobel where winner = 'PETER GRüNBERG'

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select * from nobel where winner = 'EUGENE O''NEILL'

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select winner,yr,subject from nobel where winner like 'Sir%' order by yr desc,winner asc;

14

應該是正確答案，但是不對，不知道為啥：

SELECT winner, subject FROM nobel WHERE yr=1984 ORDER BY subject IN ('Physics','Chemistry'),subject,winner

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