Question

I am trying to create a query to sum total gifts given by a certain person, but to add a flag on the individual gift when the total giving hits $500 (I don’t need to sum past that).

I have the Persons ID, the gift size, and the gift date. for example:

ID           gift_date       gift_amt
---------    -----------     --------------  
1            1/6/09          500
2            1/9/09          200
2            1/15/09         65
3            1/26/09         140
2            2/10/09         600
3            3/7/09          200

I would like a flag to be shown in my query for ID# 1 on the row with gift_date of 1/6/09, for ID#2 for gift date 2/10/09 and no flag for ID#3.

Answer 1

In Oracle and PostgreSQL 8.4:

SELECT  q.*, CASE WHEN psum > 500 THEN 1 ELSE 0 END AS flag
FROM    (
        SELECT  gd.*, SUM(gift_amt) OVER (PARTITION BY id ORDER BY gift_date) AS psum
        FROM    gift_date gd
        ) q
WHERE   psum <= 500 - gift_amt