如何在具有特定条件的组中仅将一行标记为 "active"

Question

我在 SQL Server 2014 中有一个 table，如下所示：

现在我想再添加一个名为 "Status" 的列来为同一个人标记每一行。

如果类别 = 3 且费用 <> 0，则将此行标记为 "Active"，其余行（1 和 2）将是 "non-active"；
如果 Category = 3 且 Fee = 0，则它移至 Category = 1，其中 Fee <> 0 并将其设为 "Active"，则其余的 (2, 3) 将为 "non-active";
如果 Category = 3 和 1 并且 Fee =0 ，则将最后一个（Category =2）标记为 "Active"，不管 Category 2 的 Fee = 0 / <> 0 .

我正在考虑使用 :

Status = CASE 
            WHEN (Category = 3 AND Fee <> 0 )
                 OR (Category = 3 AND Fee = 0 AND (Category = 1 AND Fee <> 0))  
                 OR (Category IN (1, 3) AND Fee = 0 AND (Category = 2 AND Fee IS NOT NULL)) 
               THEN "Active"
               ELSE "Non-Active"
         END

但我不确定它是否正确。我也想知道是否有更有效的方法来实现这个结果。

Answer 1

您可以使用 row_number():

select t.*,
       (case when 1 = row_number() over (partition by personid
                                         order by (case when category = 3 and fee <> 0 then 1
                                                        when category = 1 and fee <> 0 then 2
                                                        when category = 2 then 3
                                                   else 4 end)
             then 'active' else 'inactive'
        end) as status
from t;

如何在具有特定条件的组中仅将一行标记为 "active"

How to mark only one row as "active" in a group shared same Id with particular conditions

sql-server

case-when