如何按原始结果的结果进行分组并返回同一选择查询？

Question

如何按原始结果的结果进行分组并返回同一选择查询？

我有一个表#t与Bill Id和错误的工作流程周期。一个账单ID可能已经经历了多次相同的错误类型或不同的错误类型。

我想为每个帐单id挑选不同的错误类型并获取按错误计数组。

基于不同的错误，错误计数，我需要在同一个表中获取错误类型计数和错误类型。

我不知道该怎么做。我在本文中保留了示例查询和预期结果。

create table #t 
(
    BillId int, 
    StepName varchar(100), 
    StepExec varchar(100), 
    StepExecResult varchar(100), 
    Created_date datetime 
) 

insert into #t 
values 
    (1, 'Initiated', 'Taken Place','Pass', getdate()-10), 
    (1, 'POS', 'Deadlock Error','Error', getdate()-9), 
    (1, 'POS', 'Processed','Pass', getdate()-9), 
    (1, 'Merchandise', 'Taken Place','Pass', getdate()-8), 
    (1, 'verification', 'Webservice call error','Error', getdate()-7), 
    (1, 'verification', 'Webservice call error','Error', getdate()-6), 
    (1, 'verification', 'Webservice call','Pass', getdate()-5), 
    (1, 'verification', 'Webservice Response','Error', getdate()-5), 
    (1, 'verification', 'Webservice Response','Pass', getdate()-5), 
    (1, 'verification', 'Timeout Error','Error', getdate()-5), 
    (1, 'verification', 'Timeout Error','Error', getdate()-5), 
    (1, 'verification', 'Timeout Error','Error', getdate()-5), 
    (1, 'verification', '','Pass', getdate()-5), 
    (1, 'Payment', 'calculationError','Error', getdate()-4), 
    (1, 'Payment', 'calculationProcessed','Pass', getdate()-3), 
    (1, 'Completed', 'Archived','Pass', getdate()-1), 
    (2, 'Initiated', 'Taken Place','Pass', getdate()-10), 
    (2, 'POS', 'Deadlock Error','Error', getdate()-9), 
    (2, 'POS', 'Processed','Pass', getdate()-9), 
    (2, 'Merchandise', 'Taken Place','Pass', getdate()-8), 
    (2, 'verification', 'Webservice call error','Error', getdate()-7), 
    (2, 'verification', 'Webservice call error','Error', getdate()-6), 
    (2, 'verification', 'Webservice call','Pass', getdate()-5), 
    (2, 'verification', 'Webservice Response','Error', getdate()-5), 
    (2, 'verification', 'Webservice Response','Pass', getdate()-5), 
    (2, 'verification', '','Pass', getdate()-5), 
    (2, 'Payment', 'calculationProcessed','Pass', getdate()-3), 
    (2, 'Completed', 'Archived','Pass', getdate()-1) 

select * 
from #t 
order by Created_date desc 

select * 
from #t 
where StepExecResult = 'Error' 

;With cte as 
(
    select 
     *, 
     row_number() over (partition by Billid,StepExec order by StepExecResult) as rownum 
    from 
     #t 
    where 
     StepExecResult = 'Error' 
) 
select * 
from cte 
where rownum = 1 

select 
    stepname, count(*) as ErrorCount 
from 
    #t 
where 
    StepExecResult = 'Error' 
group by 
    stepname 

预计输出

StepName  TotalStepError  ErrorType  ErrorTypeCount 
-------------------------------------------------------------- 
Payment    1   calculationError  1 
POS     2   Deadlock Error   2 
verification  5   Timeout Error   1 
verification  5   Webservice Response  2 
verification  5   Webservice call error 2 

Answer 1

你可以通过StepName和StepExec为ErrorTypeCount分组BILLID的重复计数。然后只需使用窗函数来总结每StepName那算不算

SELECT StepName , 
     SUM(COUNT(DISTINCT BillId)) OVER (PARTITION BY StepName) TotalStepError, 
     StepExec , 
     COUNT(DISTINCT BillId) ErrorTypeCount 
FROM #t 
WHERE StepExecResult = 'Error' 
GROUP BY StepName, 
     StepExec