Som du kan se, opretter jeg et group_id så group_id = 1 vil være den mindre TimeStamp for hver port
Det andet felt er time_id så i ORDER BY efter jeg har valgt alle 1 medbring alle 2,3,4 for enhver port.
SELECT *
FROM (
SELECT *,
row_number() over (partition by "port" order by "insertTimeStamp") group_id,
row_number() over (order by "insertTimeStamp") time_id
FROM Table1 T
) as T
ORDER BY CASE
WHEN group_id = 1 THEN group_id
ELSE time_id
END
LIMIT 4
OUTPUT
| insertTimeStamp | port | data | group_id | time_id |
|-----------------|------|------|----------|---------|
| 1 | 20 | aaa | 1 | 1 |
| 2 | 21 | aza | 1 | 3 |
| 15 | 22 | 2aa | 1 | 8 |
| 2 | 20 | aba | 2 | 2 |