How to inverse column and row in Redshift?

Question

How can I inverse my data in Redshift from

user_id	type1	type2
1	true	false
2	true	false

to

user_id	type	value
1	type1	true
1	type2	false
2	type1	true
2	type2	false

Answer 1

One approach uses a union all:

SELECT user_id, 'type1' AS type, type1 AS value FROM yourTable UNION ALL
SELECT user_id, 'type2', type2 FROM yourTable
ORDER BY user_id, type;