Question

我需要这个查询的帮助。对于这个问题，我们有两个关于战列舰及其战斗的模式：船舶（名称，年份，国家，号码，枪支，排量）战斗（船，战斗名称，结果）问题如下：写一个查询，其中战列舰拥有第二大枪支的枪支。更准确地说，找到枪支尺寸仅超过一个枪支尺寸的船只，无论其他船只有多大的枪支尺寸。列出船舶名称及其枪支尺寸。我试图解决问题，我的答案如下：

Select smax.name, smax.gunSize
From   ships smax
Where ((select s.name,s.gunSize
                from Ships s
                where s.gunSize NOT EXISTS ( select ss.gunSize from ships ss where ss.gunSize >= ALL(select 
                ss1.gunSize from ships ss1))) AS temp) 
         AND smax.gunSize >= ALL (select temp.gunSize from ships temp)

感谢您花时间阅读并回答！

Answer 1

SELECT name, gunSize
  FROM (SELECT name, gunSize, dense_rank() OVER (ORDER BY gunSize DESC) r)
 WHERE r = 2

Answer 2

尝试以下方法：

Select name, gunSize from ships
where gunSize=(
  select max(gunSize) as SecondBiggest from ships 
  where gunSize<(select max(gunSize) as Biggest from ships)
  )

编辑：提示：SecondBiggest和Biggest别名用于说明每个子查询的作用。

SQL查询：拥有第二大枪支尺寸

2 个答案: