要从2个表的oracle db的2个表中获得每个科目的得分最高的三个学生的名字

Question

假设我有两个表：1）带有姓名和卷号的学生2）带有卷号，主题和分数的表。

我想获得输出，以便向我显示每个科目的前三名学生的名字。

可以使用的表的脚本是：

CREATE TABLE STUDENT ( ROLL_NO INT PRIMARY KEY, NAME VARCHAR(20));
INSERT INTO STUDENT VALUES (1,'NIKHIL');
INSERT INTO STUDENT VALUES (2,'VARUN');
INSERT INTO STUDENT VALUES (3,'NISHANT');
INSERT INTO STUDENT VALUES (4,'VISHAL');
INSERT INTO STUDENT VALUES (5,'GOURAV');
INSERT INTO STUDENT VALUES (6,'HEMANT');
INSERT INTO STUDENT VALUES (7,'SHUBHAM');
INSERT INTO STUDENT VALUES (8,'DHAWAN');
INSERT INTO STUDENT VALUES (9,'GAUTAM');


CREATE TABLE MARKS ( ROLL_NO INT, SUBJECT VARCHAR(20), MARKS INT);
INSERT INTO MARKS VALUES('1','MATHS','92');
INSERT INTO MARKS VALUES('1','SCIENCE','80');
INSERT INTO MARKS VALUES('1','ENGLISH','98');
INSERT INTO MARKS VALUES('1','HINDI','81');
INSERT INTO MARKS VALUES('2','MATHS','89');
INSERT INTO MARKS VALUES('2','SCIENCE','100');
INSERT INTO MARKS VALUES('2','ENGLISH','81');
INSERT INTO MARKS VALUES('2','HINDI','82');
INSERT INTO MARKS VALUES('3','MATHS','98');
INSERT INTO MARKS VALUES('3','SCIENCE','92');
INSERT INTO MARKS VALUES('3','ENGLISH','88');
INSERT INTO MARKS VALUES('3','HINDI','83');
INSERT INTO MARKS VALUES('4','MATHS','88');
INSERT INTO MARKS VALUES('4','SCIENCE','82');
INSERT INTO MARKS VALUES('4','ENGLISH','85');
INSERT INTO MARKS VALUES('4','HINDI','97');
INSERT INTO MARKS VALUES('5','MATHS','94');
INSERT INTO MARKS VALUES('5','SCIENCE','90');
INSERT INTO MARKS VALUES('5','ENGLISH','97');
INSERT INTO MARKS VALUES('5','HINDI','89');
INSERT INTO MARKS VALUES('6','MATHS','89');
INSERT INTO MARKS VALUES('6','SCIENCE','82');
INSERT INTO MARKS VALUES('6','ENGLISH','84');
INSERT INTO MARKS VALUES('6','HINDI','85');
INSERT INTO MARKS VALUES('7','MATHS','82');
INSERT INTO MARKS VALUES('7','SCIENCE','100');
INSERT INTO MARKS VALUES('7','ENGLISH','92');
INSERT INTO MARKS VALUES('7','HINDI','98');
INSERT INTO MARKS VALUES('8','MATHS','99');
INSERT INTO MARKS VALUES('8','SCIENCE','91');
INSERT INTO MARKS VALUES('8','ENGLISH','86');
INSERT INTO MARKS VALUES('8','HINDI','82');
INSERT INTO MARKS VALUES('9','MATHS','100');
INSERT INTO MARKS VALUES('9','SCIENCE','95');
INSERT INTO MARKS VALUES('9','ENGLISH','81');
INSERT INTO MARKS VALUES('9','HINDI','81');

Run It Here

感谢您的帮助我需要在oracle上运行它

Answer 1

下面将加入表格并根据标记确定等级并通过主题对其进行划分

SELECT *
FROM
    (SELECT name,
        subject,
        marks,
        row_number() over (partition BY subject order by marks DESC) rank
    FROM student
    JOIN marks
    ON  student.roll_no = marks.roll_no
    )
WHERE rank <= 3

Answer 2

;with  cte as
(
   select S.Roll_no,S.Name,m.Subject,m.Marks, ROW_NUMBER() over(partition by m.subject order by s.Roll_no)as RowID from Marks as m
   right outer join student as s
   on m.Roll_no=s.Roll_no
)select * from cte where RowID<=3