set enable_seqscan=off; CREATE TABLE test_time ( i time ); INSERT INTO test_time VALUES ( '03:55:08' ), ( '04:55:08' ), ( '05:55:08' ), ( '08:55:08' ), ( '09:55:08' ), ( '10:55:08' ) ; CREATE INDEX idx_time ON test_time USING rum (i); SELECT * FROM test_time WHERE i<'08:55:08'::time ORDER BY i; i ---------- 03:55:08 04:55:08 05:55:08 (3 rows) SELECT * FROM test_time WHERE i<='08:55:08'::time ORDER BY i; i ---------- 03:55:08 04:55:08 05:55:08 08:55:08 (4 rows) SELECT * FROM test_time WHERE i='08:55:08'::time ORDER BY i; i ---------- 08:55:08 (1 row) SELECT * FROM test_time WHERE i>='08:55:08'::time ORDER BY i; i ---------- 08:55:08 09:55:08 10:55:08 (3 rows) SELECT * FROM test_time WHERE i>'08:55:08'::time ORDER BY i; i ---------- 09:55:08 10:55:08 (2 rows)