How do i find duplicate guid values

Is there a way for me to return me to find duplicate unique identifiers in a table.

So for example say we have the the following fields in a table i.e. ID, ClientID, Name

Lets say ClientId is a unqiueIdentifer and i want to return all clientids which are contained in the table more than once?

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Bob HoffmanDeveloperCommented:
select a.* from table a
where (select count(*) from table b where b.clientId = a.clientId) > 1
select client_id, count(*) from table
 group by client_id
 having count(*) > 1

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Replace my client_id column name with your ClientID column name.
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Microsoft SQL Server

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