SELECT
ClassName,
(SELECT SUBSTRING((SELECT ',' + StudentName FROM Students WHERE ClassId = Classes.Id FOR XML PATH('')),2,200000)) as StudentNames
FROM
Classes
WHERE
ClassId = 1
Before :
Class 1 | Student 1
Class 1 | Student 2
Class 1 | Student 3
After :
Class 1 | Student1, Student 2, Student 3
Class 1 | Student 1
Class 1 | Student 2
Class 1 | Student 3
After :
Class 1 | Student1, Student 2, Student 3
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