[英]SQL AWS Athena Group by Without a Column
我有这个数据集
patient_id doctor_id status created_at
1 1 A 2020-10-01 10:00:00
1 1 P 2020-10-01 10:30:00
1 1 U 2020-10-01 10:35:00
1 2 A 2020-10-01 10:40:00
...
我想按patient_id和doctor_id对其进行分组,但没有对状态进行分组,因此结果将是这样的
patient_id doctor_id status created_at
1 1 U 2020-10-01 10:35:00
1 2 A 2020-10-01 10:40:00
...
AWS Athena 必须对所有列进行分组,但我需要最后一个状态
ROW_NUMBER
在这里提供了一个选项:
WITH cte AS (
SELECT *,
ROW_NUMBER() OVER (PARTITION BY patient_id, doctor_id ORDER BY created_at DESC) rn
FROM yourTable
)
SELECT patient_id, doctor_id, status, created_at
FROM cte
WHERE rn = 1
ORDER BY patient_id, doctor_id;
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