SQL Server 2012 Basic way of removing doubles? -

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I am new to SQL Server and it is only related to school.

I restrict myself SELECT , WHERE and ORDER BY

I This code is 

  Use Northwind Select Manufacturer, Unit Part, Discount from [Order Details] where UnitPrice & gt; 100 and discount! By using   
  different , there should be no doubles, can I still manage it anyway?  
 Edit: The assignment has to be unique product ID, so it basically ends with 29 and 38. Enter total 2 Lines: S  
  
 image details according to assignment Here    
 
 
 This will allow you to only get productivity which is unique  
 Select  from the different productivity [Order details] where unitpris & gt; 100 exemptions! = 0

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