SQL server 2008 R2, pilih satu nilai kolom untuk setiap nilai berbeda dari kolom lain

SELECT 
 name,MIN(id_num)
FROM YourTable
GROUP BY name

PERBARUI: Jika Anda ingin memilih id_num secara acak, Anda dapat mencoba ini

WITH cte AS (
  SELECT 
    name, id_num,rn = ROW_NUMBER() OVER (PARTITION BY name ORDER BY newid())
  FROM YourTable
)
SELECT *
FROM cte
WHERE rn = 1

Demo Fiddle SQL