SQL Server與多個條件計數的不同查詢

我正在嘗試創建一個查詢，以爲我提供幾分鐘的測試數據行的週轉時間。SQL Server與多個條件計數的不同查詢

表的簡潔版本是：

測試名，的startDateTime，EndDateTime

我要尋找一個查詢，可以給我一個輸出類似：

Distinct TestName 
, StartDate[not time] 
, Count(rows) as Total 
, Count(rows where datediff(minute, StartDateTime, EndDateTime) <=60) as NonBreach 
, Count(rows where datediff(minute, StartDateTime, EndDateTime) >60) as Breach 
, Count(rows where datediff(minute, StartDateTime, EndDateTime) >60)/Count(rows) as BreachRate

這是原理甚至可能？

任何方向將不勝感激。

來源

2013-02-05 user2044096

您也可以隨時加入結果形成的測試名不同查詢 – Techmonk

你可以使用這樣的事情：

SELECT TestName, 
     CAST(StartdateTime AS DATE) AS StartDate, 
     COUNT(*) AS Total, 
     COUNT(CASE WHEN DATEDIFF(MINUTE, StartDateTime, EndDateTime) <= 60 THEN 1 END) AS NonBreach, 
     COUNT(CASE WHEN DATEDIFF(MINUTE, StartDateTime, EndDateTime) > 60 THEN 1 END) AS Breach, 
     1.0 * COUNT(CASE WHEN DATEDIFF(MINUTE, StartDateTime, EndDateTime) > 60 THEN 1 END)/COUNT(1) AS BreachRate 
FROM YourTable 
GROUP BY TestName, CAST(StartdateTime AS DATE)

雖然這取決於你的DBMS，您可能需要使用不同的方法從日期中刪除時間

從日期刪除時間：

SQL-Server 2008及更高版本：

SELECT CAST(CURRENT_TIMESTAMP AS DATE)

SQL-Server 2005和此前

SELECT DATEADD(DAY, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP), 0)

MySQL & SQLite

SELECT DATE(CURRENT_TIMESTAMP)

Oracle

SELECT TRUNC(CURRENT_TIMESTAMP)

Postgresql

SELECT CURRENT_TIMESTAMP::DATE

來源

2013-02-05 18:13:33 GarethD

+1爲您的1.0 *轉換爲十進制的方法。但是在OP中有兩個'Startdate'列名是'StartDateTime'。 –

@BernhardHofmann謝謝。編輯並更改爲'StartDateTime'。 – GarethD

感謝您在日期操作上的additioanl位。 – user2044096

使用SQL Server 2008的語法（其它數據庫有稍微不同的方法datediff和cast(... as date)：

select TestName 
,  cast(StartDateTime as date) as StartDate 
,  count(*) as Total 
,  sum(case when datediff(minute, StartDateTime, EndDateTime) <= 60 
      then 1 end) as NonBreach 
,  sum(case when datediff(minute, StartDateTime, EndDateTime) > 60 
      then 1 end) as Breach 
,  1.0 * sum(case when datediff(minute, StartDateTime, EndDateTime) > 60 
      then 1 end)/count(*) as BreachRate 
from YourTable 
group by 
     TestName 
,  cast(StartDateTime as date)

來源

2013-02-05 18:13:16 Andomar

感謝這麼多 - 什麼是布偶 - 所以簡單;我的頭因爲需要獨特的測試而被抓住了。 – user2044096

據我所知，這是不可能做到這一點是這樣的。也許你可以做這樣的事情：

Select TestName 
    , StartDate[not time] 
    , Count(rows) as Total 
    , SUM(CASE WHEN datediff(minute, StartDateTime, EndDateTime) <=60 THEN 1 ELSE 0 END) as NonBreach 
    , SUM(CASE WHEN datediff(minute, StartDateTime, EndDateTime) >60 THEN 1 ELSE 0 END) as Breach

來源

2013-02-05 18:15:49

您不能在同一個查詢中使用不同的聚合（如總和或計數） – Andomar

您的權利，我只是複製了問題，並沒有改變它。抱歉 –

SQL Server與多個條件計數的不同查詢

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