SQL ZOO练习——The nobel table can be used to practice more SUM and COUNT functions

这篇博客提供了SQL ZOO练习,通过Nobel表格来练习使用SUM和COUNT函数解决一系列问题,包括展示各科奖项总数、各科唯一奖项、物理学奖项数量等10个具体任务。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

1. Show the total number of prizes awarded.

SELECT COUNT(winner) FROM nobel

2. List each subject - just once.

SELECT DISTINCT subject FROM nobel

3. Show the total number of prizes awarded for Physics.

SELECT COUNT(winner) FROM nobel
  WHERE subject = 'Physics'

4. For each subject show the subject and the number of prizes.

SELECT subject, COUNT(winner) FROM nobel
  GROUP BY subject

5. For each subject show the first year that the prize was awarded.

SELECT subject, MIN(yr) FROM nobel
  GROUP BY subject

6. For each subject show the number of prizes awarded in the year 2000.

SELECT subject, COUNT(yr) FROM nobel
  WHERE yr = 2000
    GROUP BY subject

7. Show the number of different winners for each subject.

SELECT subject, COUNT(DISTINCT(winner)) FROM nobel
  GROUP BY subject

8. For each subject show how many years have had prizes awarded.

SELECT subject, COUNT(DISTINCT(yr)) FROM nobel
  GROUP BY subject

9. Show the years in which three prizes were given for Physics.

SELECT yr FROM nobel
  WHERE subject = 'Physics'  
    GROUP BY yr
      HAVING COUNT(*) = 3

10. Show winners who have won more than once.

SELECT winner FROM nobel
  GROUP BY winner
    HAVING COUNT(winner) >= 2

 

评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值