How to solve this specific SQL query - mysql

Question

I have post 3 Tables structure like this Course,Students,CourseAllot with Data here i need how to multiple row combine single row.How to show the based on the name concatenate and show them
Create Table Course
(
CourseId int Primary key Identity(1,1),
CourseName Varchar(50)
)
Insert into Course values('C#')
Insert into Course values('Asp.net')
Insert into Course values('Sqlserver')
Insert into Course values('MySql')
Create Table Students
(
StudentId int Primary key identity(1,1),
StudentName varchar(30)
)
Insert into Students values('John')
Insert into Students values('David')
Insert into Students values('Hendry')
Insert into Students values('Smith')
Insert into Students values('Watson')
Create Table CourseAllot
(
AllotId int Primary key identity(1,1),
CourseId int,
StudentId int
)
Insert into CourseAllot values (1,1)
Insert into CourseAllot values (1,1)
Insert into CourseAllot values (2,1)
Insert into CourseAllot values (1,2)
Insert into CourseAllot values (3,4)
Insert into CourseAllot values (3,5)
I need Output this
Sno Course Name Student Name
1 C# John,Hendry,David
2 Asp.net John
3 Sqlserver Smith,WatSon

Answer 1

if you are in sqlserver use bellow query
with cte(courseName,c)
as
(select courseName,c= studentname from CourseAllot
inner join Course on CourseAllot.CourseId=Course.CourseId
inner join Students on Students.StudentId=CourseAllot.StudentId
group by courseName,studentname
)
select ROW_NUMBER() over(order by courseName) as rowno, courseName,
stuff((select ','+c from cte t where t.courseName=t2.courseName
for xml path('')),1,1,'') as StudentName from cte t2 group by t2.courseName