Remove space from end of all records in a table

I have a table that contains a lot of usernames. Some of the usernames is stored with a trailing space, and I need to remove this. It means that "johndoe[space]" should be "johndoe".

This SQL returns all records that has usernames ending with space:

SELECT TOP (1000) UserName FROM tblUserVisit WHERE (UserName LIKE '% ')

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How can this SQL be modified to remove the trailing space from the usernames?
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webressursAsked:
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Haris DulicCommented:
this will remove spaces in the end... If you want to remove spaces on the begining then you can use TRIM..

update 
tblUserVisit 
set UserName =rtrim(UserName )
where (UserName LIKE '% ')

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