Time difference among end dates of first records to next record first dates

Question

How to find the dates difference in minutes among different columns levels as

No SourceID  RecordID  Start Date               End Date
1  1         1         20         


        

Answer 1

SELECT SourceId,
       RecordId,
       StartDate,
       EndDate,
       DATEDIFF(mi,a.EndDate,b.StartDate) DiffMin
FROM table a
LEFT JOIN table b ON A.no = B.no-1

Answer 2

SELECT  SourceId,RecordId,StartDate,EndDate
   , DATEDIFF(mi,a.EndDate,b.StartDate) DiffMin
FROM table a
LEFT JOIN table b ON A.no = B.no+1