oracle - 需要获取最新日期的数据

Question

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Answer 1

您可以使用 row_number窗口函数枚举每个 person_id 的记录，并选择“最后”一个 - 具有非空 pstatus 或最新日期:

SELECT person_id, date, pstatus, px1
FROM   (SELECT person_id, date, pstatus, px1,
               ROW_NUMBER() OVER (PARTITION BY person_id
                                  ORDER BY CASE WHEN pstatus IS NOT NULL 
                                                THEN 0 
                                                ELSE 1 END ASC, 
                                           date DESC) AS rn
        FROM mytable) t
WHERE  rn = 1