仅返回RANK（）之后的最小值

Question

我使用以下方法创建了某些“案例”：

RANK() OVER(ORDER BY name, A, B, some_value) as case_id

现在，我需要在每个case_id中创建等级，其中名称只能出现一次，并且最低等级应分配给最低some_value。

这是数据示例：

和所需的输出：

Answer 1

Select * from ( 

    Select Name, A, B, some_value, case_id 
    , ROWNO() over (partition by case_id, Name order by some_value) as R1
    from (
        Select 'SF' as Name, 'y' as A, 'n' as B, 120 as some_value, 1 as case_id
        union all Select 'NY' as Name, 'y' as A, 'n' as B, 150 as some_value, 1 as case_id
        union all Select 'LA' as Name, 'y' as A, 'n' as B, 155 as some_value, 1 as case_id
        union all Select 'SF' as Name, 'y' as A, 'n' as B, 160 as some_value, 1 as case_id
        union all Select 'SF' as Name, 'n' as A, 'y' as B, 110 as some_value, 5 as case_id
        union all Select 'NY' as Name, 'n' as A, 'y' as B, 120 as some_value, 5 as case_id
        union all Select 'LA' as Name, 'n' as A, 'y' as B, 125 as some_value, 5 as case_id
        union all Select 'LA' as Name, 'n' as A, 'y' as B, 140 as some_value, 5 as case_id
        union all Select 'NY' as Name, 'n' as A, 'y' as B, 155 as some_value, 5 as case_id
    ) testdata

    ) data
Where R1 = 1
order by case_id, some_value