Is it possible to do this math in a view?

I have been tasked with creating a view for a client. Specifically it must be in a view. However, there is some math that I am not sure how to do within a view. I do not know if it is even possible. But then again, my mind is feeble.

I am using SQL Server 2008R2, so advanced OVER() functionality doesn't work.

Let's say a person is given $400 to spend. They can spend more, but the first $400 is free. One column of the report will have the amount the person spent on something, and another will have the total amount the person needs to pay out of their own pocket.

So, for the first record in the report for this person, one column will have an amount they have spent, say $50, and then a second column will have a $0. Behind the scenes they still have $350 to spend.

The next record has the person spending $300. The second column will still show a $0, and behind the scenes the initial $400 is now $50.

The third record for the person shows they spent $75 dollars, but they only have $50 left over from the initial $400. The second column should now have a $25 value in it. They have exhausted the initial $400 and are now spending their own money.

The fourth record shows they spent $40, so now the second column will show a $65. etc...

I have briefly read about CTEs and table valued functions and such, but is it possible to use them in any combination to give the desired behavior above?

Below is some sample code for structure and desired results

CREATE TABLE Payroll (
    PersonID int,
    PlanCode varchar(10),
    Deduction int NULL
)
GO

INSERT INTO Payroll (PersonID, PlanCode, Deduction)
VALUES (1, 'Medical', 200)
  ,(1, 'Dental', 250)
  ,(1, 'Vision', 300)
  ,(2, 'Medical', 100)
  ,(2, 'Dental', 150)
  ,(2, 'Vision', 100)
  ,(2, 'Disability', 100)
  ,(2, 'Life', 140)

Desired results:

It may make sense to think of the OutOfPocket as TotalOutOfPocket.

There is nothing like a timestamp in the source data for ordering of the entries. The ordering is not

Something along these lines maybe? You can do running totals with the OVER clause for SUM.

CREATE TABLE Expenses (
    expense_id int NOT NULL IDENTITY(1,1) PRIMARY KEY CLUSTERED,
    amount decimal(19,5)
)

INSERT INTO Expenses (amount) VALUES (50), (300), (75), (40)
GO

WITH running_total AS (
    SELECT
        expense_id,
        amount,
        SUM(amount) OVER (ORDER BY expense_id ROWS UNBOUNDED PRECEDING) AS total
    FROM Expenses
)
SELECT
    expense_id,
    amount,
    total,
    CASE WHEN total > 400 THEN total - 400 ELSE 0 END AS out_of_pocket_total
FROM running_total
ORDER BY expense_id

StackExchange Database Administrators Q#150329, answer score: 6