sql表示Active和Inactive状态

Question

我写了一个sql来得到以下结果：

  Case No: 1          Status:Inactive
    Case No: 2          Status:Active
    Case No: 2          Status:Inactive
    Case No: 3          Status:Active

sql是：

select Case No, 
Case when status in ( 'Hospital', 'Discharge') then 'Inactive' else 'Active' end as status
from Cases

如果情况为no，例如情况为2，则存在不同的状态：Inactive和Active，则状态为非活动状态。 如何修改Sql以获得以下结果？

Case No :1              Status:Inactive
Case No :2              Status:Inactive
Case No: 3              Status:Active

Answer 1

根据您的状态名称，使用max()似乎就足够了：

select CaseNo, 
       max(Case when status in ( 'Hospital', 'Discharge') then 'Inactive' else 'Active'
           end) as status
from Cases
group by CaseNo;

更通用的解决方案不依赖于名称的词典排序：

select CaseNo, 
       (case when sum(status in ('Hospital', 'Discharge')) > 0
             then 'Inactive'
        else 'Active'
           end) as status
from Cases
group by CaseNo;

Answer 2

尝试以下查询

Select [Case No],
CASE MAX(Status) WHEN 0 THEN 'active' ELSE 'Inactive' END Status 
FROM
(
 select [Case No], 
   CASE WHEN  status in ( 'Hospital', 'Discharge') THEN 1 ELSE 0 END status
  from Cases ) C
group by [Case No]

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