SQL 服務器中 2 個變量的不同計數

Question

我的表有列id和status ( failed , success ) 和status_id 。 在保存成功響應之前，失敗條目是多余的。 如何獲取不同的成功和失敗計數失敗嘗試只計算一次？

我試過的查詢：

select 
    sum(case when status_id in (1,2,3,4) then 1 else 0 end) as success, 
    sum(case when status_id in (5,6,7,8) then 1 else 0 end) as failed
from test

此查詢有效，但失敗的嘗試計數兩次

ID	status_id	地位
123	5	失敗的
123	1	成功
123	7	失敗的
123	5	失敗的

所需 output 成功 - 1 失敗 - 2

Answer 1

要僅計算每個成功/失敗一次，請在聚合之前在派生表中執行select distinct ：

select 
    sum(case when status_id in (1,2,3,4) then 1 else 0 end) as success, 
    sum(case when status_id in (5,6,7,8) then 1 else 0 end) as failed
from (select distinct status_id from test) dt

Answer 2

計算唯一的 status_id 可能會起作用。

select 
 COUNT(DISTINCT case when status_id in (1,2,3,4) then status_id end) as success, 
 COUNT(DISTINCT case when status_id in (5,6,7,8) then status_id end) as failed
from test