The nobel table can be used to practice more subquery./zh

諾貝爾獎:子查詢

此教程有關子查詢

練習

• Chemistry 化學獎
• Economics 經濟獎
• Literature 文學獎
• Medicine 醫學獎
• Peace 和平獎
• Physics 物理獎

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 * 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2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
winner <> 'Toshihide Maskawa' 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 subject = 'Physics' and 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