Question

我有下表并使用oracle sql

TestName  Status
ABC       Passed_On_ReRun
123       Failed
EFG       Passed

结果

Submit

问题：需要查询才能获取。我尝试过MAX但不能正常工作

Answer 1

您可以使用窗口功能来做到这一点：

select 
    TestName,
    case 
        when Status = 'Passed' and failed_once = 1 
        then 'Passed_On_Rerun'
        else Status
    end Status
from (
    select
        t.*,
        rank() over(partition by TestName order by Timestamp desc) rn,
        max(case when Status = 'Failed' then 1 else 0 end) over(partition by TestName) failed_once
    from TestCaseStatus t
) t
where rn = 1

Demo on DB Fiddle ：

TESTNAME | STATUS         
:------- | :--------------
123      | Failed         
ABC      | Passed_On_Rerun
EFG      | Passed

Answer 2

您可以通过以下查询实现所需的目标：

SELECT T1.TestName, T1.Status 
FROM TestCaseStatus T1
WHERE T1.TimeStamp = 
     (SELECT MAX(T2.TimeStamp) FROM TestCaseStatus T2 WHERE T2.TestName = T1.TestName)

但是，您的示例数据有问题：

123       Failed    11.00 AM
123       Passed    11.00 AM

同一测试失败并通过了相同的时间戳记？！

编辑：为了满足“ Passed_On_ReRun”的需要，我们可以想象这样的解决方案：

SELECT T1.TestName, IF(T1.count > 0 AND T1.Status = 'Passed', 'Passed_On_ReRun', T1.Status)
FROM 
    (SELECT T2.TestName
            , T2.Status
            , SUM(T2.Status = 'Failed') AS count
            , MAX(T2.TimeStamp) AS TimeStamp 
     FROM TestCaseStatus T2 
     GROUP BY T2.TestName) T1

Answer 3

假设只有这三个条件，则可以使用条件聚合：

select testname,
       (case when max(timestamp) = max(case when status = 'Failed' then timestamp end)
             then 'Failed'
             when max(timestamp) = max(case when status = 'Passed' then timestamp end) and
                  sum(case when status = 'Failed' then 1 else 0 end) > 0
             then 'Passed_On_Rerun'
             when max(timestamp) = max(case when status = 'Passed' then timestamp end)
             then 'Passed'
             else '???'
         end)
from TestCaseStatus tcs
group by testname;

在Oracle中，您可以将其简化为：

select testname,
       (case when max(status) keep (dense_rank first order by timestamp desc) = 'Passed' and
                  sum(case when status = 'Failed' then 1 else 0 end) > 0
             then 'Passed_On_Rerun'
             else max(status) keep (dense_rank first order by timestamp desc)
         end)
from TestCaseStatus tcs
group by testname;

Here是db <>小提琴。

keep语法正在根据时间戳获取状态的最后一个值。

根据条件从相同的列中选择一个值

3 个答案: