Calculate open hours

I am using a SQL query

select 
    datediff(hour, Convert(DateTime, Convert(DateTime, Convert(nVarChar, cast(complaintdate as datetime), 101)) + '' +  
            开发者_运维问答 Convert(varchar, complainttime, 114)), dateadd(mi, 330, GETUTCDATE())) 
from complaintregister

it creates results like:

No column name
  15455
  15259
  15190
  15190
  15165
   300
   200
  1000
   500

and I want the colum only containg values > 1000

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I agree with Jon Skeet's comment, but to answer your question, surely you only need to add a where clause: "where [Open Hours] > 500"?