SQL Select语句返回来自同一个表的下一个日期时间的分钟差异

Question

I have a user activity table. I want to see a difference between each process in minutes. To be more specific here is a partial data from table.

Date                |TranType|   Prod          |    Loc
-----------------------------------------------------------
02/27/12 3:17:21 PM | PICK   | LIrishGreenXL   |     E01C015
02/27/12 3:18:18 PM | PICK   | LAntHeliconiaS  |     E01A126
02/27/12 3:19:00 PM | PICK   | LAntHeliconiaL  |     E01A128
02/27/12 3:19:07 PM | PICK   | LAntHeliconiaXL |     E01A129 

I want to retrieve time difference in minutes, between first and second process, than second and third and .... Thank you

Answer 1

Something like this will work in MS SQL, just change the field names to match yours:

 select a.ActionDate, datediff(minute,a.ActionDate,b.ActionDate) as DiffMin (select ROW_NUMBER() OVER(ORDER BY ActionDate) AS Row, ActionDate from [dbo].[Attendance]) a inner join (select ROW_NUMBER() OVER(ORDER BY ActionDate) AS Row, ActionDate from [dbo].[Attendance]) b on a.Row +1 = b.Row