SQL Selecting multiple sums?

Question

Let\'s say I have a table:

SELECT  SUM(quantity) AS items_sold_since_date,
        product_ID
FROM    Sales
WHERE order_date >= \'01/01/09\'
GROUP BY product_         


        

Answer 1

You could use GROUP BY to split up the Sales based on date. In Oracle you could say:

select count(*)
      ,case when order_date >= '01/01/09' then 'after' else 'before' end
from   log 
group by case when order_date >= '01/01/09' then 'after' else 'before' end;