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CREATE TABLE tablename ( id INTEGER, timestamp VARCHAR(10), attribute1 VARCHAR(1), attribute2 VARCHAR(1) ); INSERT INTO tablename (id, timestamp, attribute1, attribute2) VALUES ('1', '8/12', null, 'A'), ('1', '8/13', 'B', null), ('2', '8/12', null, 'A'), ('2', '8/13', 'C', 'B'), ('2', '8/14', 'B', null), ('3', '8/12', 'B', null), ('3', '8/14', 'C', 'C');
7 rows affected
SELECT DISTINCT id, FIRST_VALUE(attribute1) OVER (PARTITION BY id ORDER BY attribute1 IS NULL, timestamp DESC) attribute1, FIRST_VALUE(attribute2) OVER (PARTITION BY id ORDER BY attribute2 IS NULL, timestamp DESC) attribute2 FROM tablename;
id
attribute1
attribute2
1
B
A
2
B
B
3
C
C