如何在sql中獲取小時數和分鐘數

Question

SELECT LEFT(CONVERT(VARCHAR(10), OutTime - InTime, 108), 5) 
FROM Attendance 
WHERE InTime BETWEEN '01-01-2016' AND '01-31-2016' 
AND Employee=63 
ORDER BY InTime 

我已經得到了這個結果。

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我要的是所有的時間的總和。我怎樣才能在Linq中編寫相同的查詢？

Answer 1

CREATE TABLE #Attendance(OutTime DateTime, InTime DateTime) 

-- Sample Data 
insert into #Attendance(InTime, outTime) 
values ('2015-12-12 07:30', '2015-12-12 17:30'), 
('2015-12-12 07:30', '2015-12-12 17:30'), 
('2015-12-13 07:30', '2015-12-13 16:45'), 
('2015-12-14 07:30', '2015-12-14 14:34'), 
('2015-12-15 07:30', '2015-12-15 18:21') 

-- Use DateDiff function to get total minutes between times to achieve greater accuracy then with 'hour' 
-- Convert total minutes to hours after adding up total minutes 
SELECT SUM(DATEDIFF(MINUTE, InTime , OutTime)) /60 
FROM #Attendance 

DROP TABLE #Attendance 

更多的LINQ

現在：

public class Attendance 
{ 
    public DateTime InTime { get; set; } 
    public DateTime OutTime { get; set; } 
} 

[TestClass] 
public class AttendanceUser 
{ 
    [TestMethod] 
    public void UseALambda() 
    { 
     var rand = new Random(); 
     var attendances = Enumerable.Range(0, 10).Select(x => 
      new Attendance { InTime = DateTime.Now.AddHours(-rand.Next(x)), OutTime = DateTime.Now.AddHours(rand.Next(x)) }).ToList(); 

     var total = attendances.Sum(x => (x.OutTime - x.InTime).TotalMinutes)/60; 
    } 
} 

Answer 2

SQL Server不具有代表時間跨度一個 datetype。因此，它通常是最好的一切轉化爲int s表示代表你需要的結果的粒度（這裏，分）：

SELECT SUM(DATEDIFF(minute,InTime,OutTime)) as TotalMinutes 
FROM Attendance 
WHERE InTime BETWEEN '20160101' AND '20160131' 
AND Employee=63 
--ORDER BY InTime 

而再轉化（天），小時和分鐘在表示層。

而且，指出的問題如下，如果你想包括在1月的最後一天發生事件，改變你的WHERE條款：

SELECT SUM(DATEDIFF(minute,InTime,OutTime)) as TotalMinutes 
FROM Attendance 
WHERE InTime >= '20160101' AND InTime < '20160201' 
AND Employee=63