sql - How to combine rows in Amazon Redshift

Redshift provides a function LISTAGG() for what you need

SELECT id, name, LISTAGG(Color,' ') AS Colors
FROM yourtable
GROUP BY id, name

For each group in a query, the LISTAGG aggregate function orders the
rows for that group according to the ORDER BY expression, then
concatenates the values into a single string.
http://docs.aws.amazon.com/redshift/latest/dg/r_LISTAGG.html

SELECT id, name
 , LISTAGG(Color,' ') WITHIN GROUP (ORDER BY name) AS Colors
FROM yourtable
GROUP BY id, name