Question

Running SQL Server 2008, and I am definitely a new SQL user.

I have a table that has 4 columns:

EmpNum, User, Action, Updatetime

A user logs into, and out of a system, it is registered in the database. For example, if user1 logs into the system, then out 5 minutes later, a simple query (select * from update) would look like:

EmpNum   User    Action   Updatetime
1        User1   I        2010-01-01 23:00:00:000
1        User1   O        2010-01-01 23:05:00:000

I’m trying to query the Empnum, User, Action, I(in time), O(out time), and the total time.

Answer 1

Select T1.EmpNum, T1.User, T1.UpdateTime As TimeIn
 , (Select Min(T2.UpdateTime)
      From Table As T2
      Where T2.EmpNum = T1.EmpNum
      And T2.User = T1.User
      And T2.Action = 'O'
 And T2.UpdateTime > T1.UpdateTime) As TimeOut
From Table As T1
Where Action = 'I'

EDIT In your comments you asked for TimeWorked. Since you are using SQL Server 2008, you can use an Outer Apply to calculate the out-time for each in-time row. Then it is a simple matter of using DateDiff.

Select T1.EmpNum, T1.User
    , T1.UpdateTime As TimeIn
    , TimeOut.UpdateTime As TimeOut
    , DateDiff(mi, T1.UpdateTime, TimeOut.UpdateTime) As TimeWorkedInMinutes
From Table As T1
    Outer Apply (
                Select Min(T2.UpdateTime) As UpdateTime
                From Table As T2
                Where T2.EmpNum = T1.EmpNum
                    And T2.User = T1.User
                    And T2.Action = 'O'
                    And T2.UpdateTime > T1.UpdateTime
                ) As TimeOut
Where Action = 'I'