I'd like to clear my queue in SQL Server Management Studio, but I don't want to delete the whole queue just the content in the queue (the messages).
Just combining the two previous answers (by Ben and Jānis) for clarity. This worked for me:
declare @c uniqueidentifier
while(1=1)
begin
select top 1 @c = conversation_handle from dbo.queuename
if (@@ROWCOUNT = 0)
break
end conversation @c with cleanup
end