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query to concatenate columns if record duplicate

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My table has two column that is id and name. I want to do concatenate the columns if the if more than two names are same like:

id                                                                    name
1                                                                     John
2                                                                     David
3                                                                     Zed
4                                                                     John
5                                                                     David
6                                                                     John
7                                                                     David
8                                                                     John
9                                                                     John

Now I want my output that if name is repeated than the first record will remain as it is and other will be concatenated by id like

Id                                                                     Name
1                                                                      John
2                                                                      David
3                                                                       Zed
4                                                                      4 John
5                                                                     5 David
6                                                                     6 John 
7                                                                      7 David
8                                                                      8 John
9                                                                      9 John

Can anyone please help…Thank you


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