T SQL 将一列多行数据合并为一行

CREATE FUNCTION FN_Merge (@Student NVARCHAR(50))
RETURNS NVARCHAR(50)
AS
      BEGIN
            DECLARE @Course NVARCHAR(50)
            SELECT @Course = ISNULL(@Course + ‘,‘,‘‘) + @Course
            FROM SC
            WHERE Student = @Student
            RETURN @COURSE
     END
 
SELECT DISTINCT [Student],dbo.FN_Merge([Student]) AS Course
FROM [dbo].[SC]

SELECT  DISTINCT [Student]
      ,STUFF(
                        (
                              SELECT ‘,‘+[Course]
                              FROM [dbo].[SC]
                              WHERE Student = A.Student
                              FOR XML PATH(‘‘)
                        )
                        ,1,1,‘‘
                  )AS Course
  FROM [dbo].[SC] AS A