Calculate Profit Based on First-In, First-Out Pricing

Question

Say I have purchase and sales data for some SKUs:

po_id | sku | purchase_date    | price | qty
----------------------------------------------
    1 | 123 | 2013-         


        

Answer 1

This is Oracle query but should work in any SQL. It is simplified and does not include all necessary calculations. You can add them yourself. You will see slightly diff totals as 17.50*3 not 17.50*1:

SELECT po_sku AS sku, po_total, sale_total, (po_total-sale_total) Margin
  FROM
 (
  SELECT SUM(price*qty) po_total, sku po_sku
    FROM stack_test
  GROUP BY sku
 ) a,
 (
  SELECT SUM(price*qty) sale_total, sku sale_sku
    FROM stack_test_sale
   GROUP BY sku
 ) b
 WHERE po_sku = sale_sku
 /

SKU     PO_TOTAL    SALE_TOTAL  MARGIN
---------------------------------------------------
123     168.25      164         4.25
456     420         80          340

You can also add partition by SKU if required:

SUM(price*qty) OVER (PARTITION BY sku ORDER BY sku)