Difference between revisions of "The nobel table can be used to practice more subquery./zh"

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紅十字國際委員會 (International Committee of the Red Cross) 曾多次獲得和平獎。 試找出與紅十字國際委員會同年得獎的文學獎(Literature)得獎者和年份。
 
紅十字國際委員會 (International Committee of the Red Cross) 曾多次獲得和平獎。 試找出與紅十字國際委員會同年得獎的文學獎(Literature)得獎者和年份。
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nobel('''yr, subject, winner''') 
 
<source lang='sql' class='def'>
 
<source lang='sql' class='def'>
 
SELECT subject FROM nobel  
 
SELECT subject FROM nobel  

Revision as of 03:17, 12 May 2016

諾貝爾獎:子查詢

此教程有關子查詢

練習

紅十字國際委員會 (International Committee of the Red Cross) 曾多次獲得和平獎。 試找出與紅十字國際委員會同年得獎的文學獎(Literature)得獎者和年份。

nobel(yr, subject, winner)  
SELECT subject FROM nobel 
where winner = 'International Committee of the Red Cross'
select winner , yr
from nobel where
subject ='Literature' and
yr in
(
select yr
from nobel 
where winner = 'International Committee of the Red Cross')


日本物理學家益川敏英 (Toshihide Maskawa) 曾獲得物理獎。同年還有兩位日本人一同獲得物理獎。試列出這3位日本人的名稱。

nobel(yr, subject, winner)  
select winner
from nobel
where winner = 'Toshihide Maskawa'
select winner 
from nobel where
subject = 'Physics' and
yr = (
select yr
from nobel
where winner = 'Toshihide Maskawa')

首次頒發的經濟獎 (Economics)的得獎者是誰?

nobel(yr, subject, winner)  
select winner
from nobel where
subject = 'Economics' and yr = (
select min(yr)
from nobel
where subject = 'Economics')

哪幾年頒發了物理獎,但沒有頒發化學獎?

nobel(yr, subject, winner)  
select distinct yr 
from nobel
where yr not in (
SELECT yr
  FROM nobel
 WHERE subject = 'Chemistry')


Using GROUP BY and HAVING.

哪幾年的得獎者人數多於12人呢? 列出得獎人數多於12人的年份,獎項和得獎者。

nobel(yr,subject, winner)  
Select yr, subject, winner
From nobel where yr in(
 SELECT yr
  FROM nobel
group by yr
having count(*)<12
)

哪些得獎者獲獎多於1次呢?他們是哪一年獲得哪項獎項呢? 列出他們的名字,獲獎年份及獎項。先按名字,再按年份順序排序。

nobel(yr, subject, winner)  
select winner , yr, subject
from nobel
where winner in (
SELECT winner
  FROM nobel
group by winner
having count(*) >1
)
order by winner, yr