Sql 如何在学生表中选择一个科目的最高分数和另一个科目的最低分数？

从数学科目中选择最高分数，从物理科目中选择最低分数

我只能这样想：

Select subject, max(Marks) as Max_Marks, MIN(Marks) as Min_Marks
from Student 
group by Subject

但上面的查询显示了每个主题的最大值和最小值

---

任何其他查询方法？

只需包括

WHERE

子句并执行条件聚合：

select max(case when Subject = 'math' then Marks end) as math_Max_Marks,
       min(case when Subject = 'physics' then Marks end) as physics_Min_Marks
from Student 
where Subject in ('math', 'physics');

---

只需包含

WHERE

子句并执行条件聚合：

select max(case when Subject = 'math' then Marks end) as math_Max_Marks,
       min(case when Subject = 'physics' then Marks end) as physics_Min_Marks
from Student 
where Subject in ('math', 'physics');

---

您可以使用如下查询，使用where子句和case when语句来决定是否需要使用max或min函数

Select subject, mark = (case when subject = 'math' then max(Marks) else min(Marks) end)
from Student 
where Subject = 'math'
   or Subject = 'physics'
group by Subject

---

您可以使用如下查询，使用where子句和case when语句来决定是否需要使用max或min函数

Select subject, mark = (case when subject = 'math' then max(Marks) else min(Marks) end)
from Student 
where Subject = 'math'
   or Subject = 'physics'
group by Subject

---

根据您的情况添加

其中的

查询：

CREATE TABLE #temp(SUBJECT varchar(12), MARK int)
INSERT INTO #temp(SUBJECT, MARK)
select 'Maths',   100  union
select 'Maths',   90  union
select 'Maths',   40  union
select 'Physics',   60  union
select 'Physics',   30  union
select 'Physics',   20  

Select subject, max(Mark) as Max_Marks, MIN(Mark) as Min_Marks
from #temp 
where Subject in ('maths','physics')
group by Subject

输出：

CREATE TABLE #temp(SUBJECT varchar(12), MARK int)
INSERT INTO #temp(SUBJECT, MARK)
select 'Maths',   100  union
select 'Maths',   90  union
select 'Maths',   40  union
select 'Physics',   60  union
select 'Physics',   30  union
select 'Physics',   20  

Select subject, max(Mark) as Max_Marks, MIN(Mark) as Min_Marks
from #temp 
where Subject in ('maths','physics')
group by Subject

根据您的情况添加
其中的

查询：

CREATE TABLE #temp(SUBJECT varchar(12), MARK int)
INSERT INTO #temp(SUBJECT, MARK)
select 'Maths',   100  union
select 'Maths',   90  union
select 'Maths',   40  union
select 'Physics',   60  union
select 'Physics',   30  union
select 'Physics',   20  

Select subject, max(Mark) as Max_Marks, MIN(Mark) as Min_Marks
from #temp 
where Subject in ('maths','physics')
group by Subject

输出：

CREATE TABLE #temp(SUBJECT varchar(12), MARK int)
INSERT INTO #temp(SUBJECT, MARK)
select 'Maths',   100  union
select 'Maths',   90  union
select 'Maths',   40  union
select 'Physics',   60  union
select 'Physics',   30  union
select 'Physics',   20  

Select subject, max(Mark) as Max_Marks, MIN(Mark) as Min_Marks
from #temp 
where Subject in ('maths','physics')
group by Subject

以上三个答案是正确的。
这样可能更容易理解

SELECT 
  (SELECT max(Marks) from Student WHERE subject = 'math')    AS Max_Math
, (SELECT min(Marks) from Student WHERE subject = 'physics') AS Min_Physics;

以上三个答案是正确的。
这样可能更容易理解

SELECT 
  (SELECT max(Marks) from Student WHERE subject = 'math')    AS Max_Math
, (SELECT min(Marks) from Student WHERE subject = 'physics') AS Min_Physics;

提示：
哪里需要
。提示：
哪里需要
。谢谢。我不知道这个案子是什么时候发生的。我想学习高级sql你能分享任何资源吗？@JeetashRathi。这是
案例
表情看谢谢。我不知道这个案子是什么时候发生的。我想学习高级sql你能分享任何资源吗？@JeetashRathi。它是
case
表达式查看