Sql查询创建一个计算字段

Question

我有一个这样的数据库表：

我希望我能够很好地解释这一点，所以你可以理解。

我想计算每个员工工作了多少小时 例如，对于＆＃34; Arjeta Domi＆＃34;我们有Cell（2,3） - Cell（3,3）+ Cell（4,3）+ Cell（5,3），使每个logOut时间与登录时间不同。

我想要的最终表格包含以下列：CardNo，UserName，Date，PauseTime，WorkTime

我尝试了这个问题：取自duplicate

SELECT DISTINCT
  [Card NO], 
  [User Name],  
  (
    SELECT
      MIN(DateTime) AS [Enter Time], 
      MAX(DateTime) AS [Exit Time], 
      MAX(DateTime) - MIN(DateTime) AS [Inside Hours] 
    FROM
      ExcelData
  ) 
FROM
  ExcelData
GROUP BY
  [Card NO], [User Name], DateTime

DateTime列的类型为String，而不是DateTime。 我正在使用MS Access数据库。

Answer 1

选择带有'm001-1-In'的所有行，并将DateTime作为I，并将拟合'm001-1-Exit'行添加到此处，子查询为O，这将如下所示：

SELECT t1.[Card No], t1.[User Name],dateTime as I
,(Select TOP 1 dateTime from Tab t2 where  t2.[Card No]= t1.[Card No] 
and  t2.[User Name]= t1.[User Name] and  t2.Addr='m001-1-Exit' 
and t2.DateTime>t1.datetime ORDER by DateTime) as O
FROM Tab t1
where t1.Addr='m001-1-In' 

现在很容易将其封装起来，在下面显示为Prepared并将SUM和Grouping添加到此：

SELECT [Prepared].[Card No], [Prepared].[User Name], SUM(DateDiff('n',I,O))/60 AS Hours
FROM (
      SELECT t1.[Card No], t1.[User Name],dateTime as I
    ,(Select TOP 1 dateTime from Tab t2 where  t2.[Card No]= t1.[Card No] 
      and  t2.[User Name]= t1.[User Name] and  t2.Addr='m001-1-Exit' 
      and t2.DateTime>t1.datetime ORDER by DateTime) as O
FROM Tab t1
where t1.Addr='m001-1-In' 
)  AS [Prepared]
GROUP BY [Prepared].[Card No], [Prepared].[User Name]

如果您需要限制DateRange，请将所需条件添加到行where t1.Addr='m001-1-In'

Answer 2

试试这个：

SELECT CardNo, UserName, SUM(DATEDIFF('h',DateTime,(SELECT MIN(Datetime) 
                                                    FROM table as t2 
                                                    WHERE t1.CardNo=t2.CardNo
                                                        AND t2.Addr like '%Exit' 
                                                        AND t2.DateTime > t1.DateTime )))
FROM table as t1
WHERE Addr like '%In'
GROUP BY CardNo, UserName