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我想通过合并以逗号分隔的类别来更新表格，例如，只要我们有重复的 ID：

ID            Category
802              A
802              k           
803              x             
804              y
804              z

So here is the desired results that I would like to see after the update is run:
ID            Category
802              A, k
803              x             
804              y, z

谢谢

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