Find the time difference between two consecutive rows in the same table in sql

Question

I\'m stuck. I\'ve looked for an answer, but can\'t seem to find subtracting time in the same table from two different rows of the same table that fits. I\'m having a difficu

Answer 1

Since you have mentioned PARTITION clause, given below is a version using that clause (haven't tested for syntax, but it should give you the idea)

;WITH EmpData AS
(
    SELECT  EmpID, 
                TimeIn, 
                TimeOut,
                ROW_NUMBER() OVER(PARTITION BY EmpId ORDER BY TimeIn) Position
       FROM EmployeeTime 
)
SELECT a.*
         a.TimeOut-b.TimeIn OutTIme 
   FROM EmpData a  LEFT JOIN EmpData b
         ON a.EmpId = b.EmpId
      AND a.Position-1  = b.Position