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| We have this basic SELECT statement: SELECT product_id, we_date, sum(demand_units) FROM weekly_transactions WHERE demand_units > 0 GROUP BY product_id, we_date ORDER BY product_id, we_date However, for each Product and WE_DATE, we also want the demand units for the previous 10 weeks. So far week ending 9/23/2007, we want the demand_units for that week PLUS the demand_units for the previous 10 weeks. I have NOT idea how to pull this off! Can anyone out there help me? |
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