SQL数据分组后取第一条数据——PARTITION BY

SQL 如下

找状态=1的数据，按 HospitalId,DeptId 组合并倒序排序，每组里面取第一条数据

SELECT *
    FROM
    (
        SELECT *,
                ROW_NUMBER() OVER (PARTITION BY
                                                HospitalId,
                                                DeptId
                                    ORDER BY CreateDate DESC
                                    ) AS new_index
        FROM HospitalInfo 
        WHERE Status = 1
    ) t
WHERE t.new_index = 1;