Question

http://sqlzoo.net/wiki/SELECT_from_Nobel_Tutorial

有人可以给我一些帮助来做＃8吗？我是SQL的新手，我真的不知道为什么我的答案是错的：

select yr from nobel where 
yr in (select distinct yr from nobel where subject='Physics') 
and 
yr not in (select distinct yr from nobel where subject='Chemistry')

由于

Answer 1

全部，我自己解决了。

select distinct yr from nobel 
where 
subject='Physics' and yr not in 
(select distinct yr from nobel where subject='Chemistry')

由于

我也找到了一种方法来揭示这些问题的答案（至少其中一些）只需将？answer = 1 附加到网址，您就可以获得答案页面。希望这有效！

Answer 2

我通过这个查询得到了正确的答案：

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

Answer 3

SELECT * FROM nobel WHERE（subject ='物理' AND yr ='1980'）或（subject ='Chemistry'和yr ='1984'）

这很简单直接

Answer 4

试试这段代码：

{1}

Answer 5

SELECT yr,subject,winner FROM nobel WHERE yr=1980 AND subject NOT IN('Chemistry','Medicine')

Answer 6

这是正确的答案，既合乎逻辑又以可读的形式：

SELECT yr,subject,winner
FROM nobel
WHERE (yr = 1980 and subject like 'Physics') + (yr = 1984 and subject like 'Chemistry')

SQLZOO诺贝尔教程＃8

6 个答案: