SQL Server 返回用逗號隔開的字符串

  DECLARE @TempTable TABLE (ID INT IDENTITY(1,1),Name NVARCHAR(100),Lessons NVARCHAR(100))
  INSERT INTO @TempTable ( Name, Lessons )
  SELECT '張三','語文' UNION ALL
  SELECT '李四','數學' UNION ALL
  SELECT '張三','數學' UNION ALL
  SELECT '張三','英語' UNION ALL
  SELECT '李四','語文'
  SELECT * FROM @TempTable

  　
  --返回用逗號隔開的字符串

  --定義的變量一定要先初始化賦值，否則查詢等於空
  DECLARE @Lessons NVARCHAR(max)=''
  SELECT  @Lessons=@Lessons+ISNULL(A.Lessons,'')+',' from @TempTable  AS A   WHERE Name='張三'
  SELECT @Lessons AS 'Lessons'