SELECT CASE WHEN _rank = 1 THEN name ELSE '' END AS name, amount
FROM (
    SELECT name, amount,
    	ROW_NUMBER() OVER (PARTITION BY name ORDER BY amount ASC) AS _rank
    FROM t1
) q

SELECT CASE WHEN _rank = 1 THEN name ELSE '' END AS name, amount
FROM (
    SELECT name, amount,
    	ROW_NUMBER() OVER (PARTITION BY name ORDER BY amount ASC) AS _rank
    FROM t1
) q