用EF或Linq計算休息時間的持續時間

Question

我想知道如何計算休息時間和總計與實體框架或linq。我試圖解釋我的MS SQL表。感謝您的幫助。

+---------+-------------------------+---------------+----------------+ 
| EventId | EventDurations   | EventName | AgentNumber | 
+---------+-------------------------+---------------+----------------+ 
| 1  | 2016-06-06 09:51:21.570 | Login   | 801   | 
| 2  | 2016-06-06 09:51:33.083 | Break   | 801   | 
| 3  | 2016-06-06 13:58:14.617 | Login   | 801   | 
| 4  | 2016-06-06 15:30:50.600 | Break   | 801   | 
| 5  | 2016-06-06 15:46:32.837 | Login   | 801   | 
| 6  | 2016-06-06 15:47:16.777 | Break   | 801   | 
+--------+--------------------------+---------------+----------------+ 

Answer 1

您可以在SQL查詢中使用鉛和發現：

;with cte as (
select *, datediff(mi,EventDurations, lead(EventDurations,1,EventDurations) over(partition by EventName order by EventDurations)) dur from EventTable 
) 
select EventName, sum(dur) from cte group by EventName 

它仍然不是EF或LINQ

Answer 2

你能查嗎？沒有內建的引導/延遲

;WITH CTE as 
(
    SELECT RN = ROW_NUMBER() OVER (PARTITION BY EventName ORDER BY EventDurations), * 
    FROM EventsTable 
) 
SELECT [Cur_row].*, ISNULL(DATEADD(DAY, -1, [Next_Row].EventDurations), '31-Dec-2099') AS EndDate 
FROM CTE [Cur_row] LEFT JOIN CTE [Next_Row] 
ON [Cur_row].EventId = [Next_Row].EventId AND [Next_Row].RN = [Cur_row].RN + 1 
ORDER BY [Cur_row].RN;--if require add eventid