symmetric pair in sql - mysql

Question

Given the tables student, mathematics_marks, science_marks
student
student_id (Primary Key) | smallint
student_name | varchar(30)
mathematics_marks
student_id (Primary Key) | smallint
score | float (5,2)
science_marks
student_id (Primary Key) | smallint
score | float (5,2)
A student is called as being a part of a symmetric pair if the marks obtained by that student in science is equal to the marks obtained by some other student in mathematics and the marks obtained in mathematics are the same as marks obtained by the other student in science.
Write a SQL query to print the name of the students who are a part of the symmetric pair. Order the output in order of student name.
with cte as (
select m.student_id, m.score as math_score, s.score as science_score
from mathematics_marks m inner join science_marks s
on s.student_id = m.student_id
)
select s1.student_name
from cte c1 inner join cte c2
on c2.student_id > c1.student_id and c2.math_score = c1.science_score and c1.math_score = c2.science_score
inner join student s1 on s1.student_id = c1.student_id and s1.student_id = c2.student_id
need to get the pair in two different rows?
EDITED:
answer to this
with cte as (
select m.student_id, m.score as math_score, s.score as science_score
from mathematics_marks m inner join science_marks s
on s.student_id = m.student_id
),
T as (select c1.student_id, c1.math_score, c1.science_score, s.student_name as name
from cte c1 inner join student s
on c1.student_id = s.student_id )
select t1.name from T t1 inner join T t2
on t1.math_score = t2.science_score and
t1.science_score = t2.math_score
order by t1.name

Answer 1

A properly designed schema would have a single table for student, subject, and mark. The first step then is to emulate that table, which could be as follows:
SELECT student_id
, 'mathematics' subject
, score
FROM mathematics_marks
UNION
SELECT student_id
, 'science'
, score
FROM science_marks
For further help, see: Why should I provide an MCRE for what seems to me to be a very simple SQL query?

Answer 2

It's always easy to answer if the post is accompanied by sample data and expected output . Are you looking for somthing like this
Select student.student_id
,maths.score maths_socer
,sci.score science_score
from
(
Select 1 student_id union all
Select 2 union all
Select 3
) student
Join
(
Select 1 student_id, 20 score union all
Select 2, 30 union all
Select 3, 40
) maths
on maths.student_id=student.student_id
Join
(
Select 1 student_id , 30 score union all
Select 2,20 union all
Select 3,40
) sci on sci.student_id !=student.student_id
Where sci.score = maths.score