Use DISTINCT with two fields to return one record

Question

I am using OleDB with a SELECT DISTINCT query that is used in C# code to populate a DataGridViewComboBox.  The queried table has two fields: ID and Description. The ID field values are unique. Descriptions may be duplicated. The DataSource of my DataGridViewComboBox
is ListBoxItems which is a ListBox that is populated from a table. The ValueMember is ID and the DisplayMember is Description.  A sample table might look like this:
ID    Description
 1     Blue
 2     Blue
 3     Red
 4     Blue
I want my query to return two records; one for the Red description and only one for the Blue description.  I don't care which Blue description it returns, but I do need the corresponding ID for the selected Blue record and the ID value for the Red record. 
Using SELECT DISTINCT ID, Description FROM... would give me four records instead of two.  How can I return only two records in this scenario?
Rob E.

Answer 1

Using window function:
create table #temp
ID int,
description varchar(20),
insert into #temp Values(1,'blue')
insert into #temp Values(2,'blue')
insert into #temp Values(3,'red')
insert into #temp Values(4,'blue')
;WITH CTE AS (select RN=ROW_NUMBER() OVER (PARTITION BY description ORDER BY newid() ),
ID,description from #temp)
SELECT ID, description from CTE
WHERE RN = 1;
ID description
4 blue
3 red
Kalman Toth Database & OLAP Architect
SQL Server 2014 Database Design
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