Question

我有一张表格如下：

CREATE TABLE Activities( Type VARCHAR( 20 ),  Assigned_On DATETIME ,Status VARCHAR( 20 ) )
INSERT INTO Activities
VALUES
('Clerical','06/14/2016 11:30:00','Completed')
('Technical','06/14/2016 13:00:00','Completed')
('Clerical','06/14/2016 14:30:00','Completed')
('Technical','06/14/2016 16:00:00','Completed')
('Technical','06/14/2016 17:30:00','Completed')
('Technical','06/14/2016 19:00:00','Completed')
('Clerical','06/14/2016 20:30:00','Completed')
('Technical','06/14/2016 22:00:00','Completed')
('Technical','06/14/2016 23:30:00','Completed')
('Clerical','06/15/2016 01:00:00','Completed')
('Technical','06/15/2016 02:30:00','In Progress')
('Clerical','06/15/2016 04:00:00','In Progress')
('Technical','06/15/2016 05:30:00','In Progress')
('Technical','06/15/2016 07:00:00','In Progress')
('Clerical','06/15/2016 08:30:00','Completed')
('Clerical','06/15/2016 10:00:00','Completed')
('Technical','06/15/2016 11:30:00','Completed')
('Clerical','06/15/2016 13:00:00','Completed')
('Technical','06/15/2016 14:30:00','Completed')
('Technical','06/15/2016 16:00:00','In Progress')
('Technical','06/15/2016 17:30:00','In Progress')
('Clerical','06/15/2016 17:39:00','Waiting')
('Technical','06/15/2016 17:48:00','Completed')
('Technical','06/15/2016 17:57:00','In Progress')
('Clerical','06/15/2016 18:06:00','Waiting')
('Clerical','06/15/2016 18:15:00','Waiting')
('Technical','06/15/2016 18:24:00','Completed')
('Clerical','06/15/2016 18:33:00','Completed')
('Clerical','06/15/2016 18:42:00','In Progress')
('Technical','06/15/2016 18:51:00','In Progress')
('Technical','06/15/2016 19:00:00','Waiting')
('Clerical','06/15/2016 19:09:00','Waiting')
('Technical','06/15/2016 19:18:00','Waiting')

并希望得到等待时间的摘要

Declare @datetimenow datetime
SET @datetimenow = GetDate()  -- or some date time to use for testing

Select Count(Type) datediff(Minute, Assigned_On, @datetimenow) where status = 'Waiting'

但是需要按类型分组和列表，每个类型的等待人数和最长等待时间，结果看起来像

Type      People Waiting      Wait Time (Minutes)
Clerical        5                     11:08
Technical       5                     15:38

任何想法如何？

感谢

Answer 1

我不确定我是否理解这个问题，但代码会提出一个想法：

SELECT Type, Count(*) as 'People Waiting', 
    CAST(DATEDIFF(SECOND,GetDate(), MIN(Assigned_On) ) / 60 as varchar)
    + ':' + CAST(DATEDIFF(SECOND,GetDate(), MIN(Assigned_On) ) % 60 as varchar)
    as 'Wait Time (Minutes)'
FROM Activities
WHERE Status = 'Waiting' 
GROUP BY Type;

Answer 2

首先，考虑如何找到“等待的人”和他们的等待时间。我想象这样的事情：

SELECT Type, datediff(minutes, Assigned_on, getdate()) AS WaitMinutes
FROM Activities
WHERE Status = 'Waiting'

现在应该很明显，但你只需使用COUNT(*)来获取计数，MAX(WaitMinutes)获得最长等待时间，对吧？如果您不想在WITH中执行此操作，只需使用公式进行分组：

SELECT Type,
    COUNT(*) AS PeopleWaiting,
    MAX(datediff(minutes, Assigned_On, getdate())) AS MaxWaitMinutes
FROM Activities
WHERE Status = 'Waiting'
GROUP BY Type

获取等待时间SQL Server 2012

2 个答案: