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sql server - How to concatenate values with same id in sql

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sql server - How to concatenate values with same id in sql

My table contains the details like with two fields:

User ID  Rolename
1        Editor
1        Reviewer
7        EIC
7        Editor
7        Reviewer
19       EIC
19       Editor
19       Reviewer

I want get the unique details with RoleName like 

1 Editor,Reviewer
7 EIC,Editor,Reviewer

How to combine RoleName Details? How to write the Query?

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