Subtract 2nd row with first row in table view

Hi Sandeep13 

Try this:

Difference =
VAR _hit_from = 'datatable'[HIT_FROM] -- Stores the current row's HIT_FROM value
VAR _ecv_visit = 'datatable'[ECV_VISIT] -- Stores the current row's ECV_VISIT value
VAR _prevvalue =
    MAXX (
        FILTER (
            ALL ( 'datatable' ),
            -- Ignores existing filters to scan the entire table
            'datatable'[HIT_FROM] = _hit_from -- Keeps only rows with the same HIT_FROM
                && 'datatable'[ECV_VISIT] < _ecv_visit -- Finds rows with an earlier ECV_VISIT
        ),
        [ECV_VISIT] -- Retrieves the maximum (latest) previous ECV_VISIT
    )
RETURN
    'datatable'[ECV_VISIT] - _prevvalue
-- Calculates the difference from the previous ECV_VISIT