Question

我正在尝试创建一个查询，以便在几分钟内为我提供多行测试数据的周转时间。

该表的简洁版本是：

TestName，StartDateTime，EndDateTime

我正在寻找一个可以给我输出的查询：

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

这个原则是否可能？

任何方向都会受到高度赞赏。

Answer 1

您可以使用以下内容：

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)

虽然取决于您的DBMS，您可能需要使用其他方法来删除日期之前的时间。

从日期删除时间：

SQL-Server 2008 以后：

SELECT  CAST(CURRENT_TIMESTAMP AS DATE)

SQL-Server 2005 以及之前的

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

MySQL＆amp; SQLite

SELECT DATE(CURRENT_TIMESTAMP)

<强> Oracle

SELECT TRUNC(CURRENT_TIMESTAMP)

<强> Postgresql

SELECT CURRENT_TIMESTAMP::DATE

Answer 2

使用SQL Server 2008语法（其他数据库对datediff和cast(... as date)的方法略有不同：

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)

Answer 3

据我所知，这样做是不可能的。也许你可以这样做：

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

具有多个条件计数的SQL Server Distinct查询

3 个答案: