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

something like this?:

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

Answer 2

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;

Answer 3

you can write

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

Answer 4

SELECT  SUM(CASE WHEN order_date >= '01/01/09' THEN quantity ELSE 0 END) AS items_sold_since_date,
        SUM(quantity) AS items_sold_total,
        product_ID
FROM    Sales
GROUP BY product_ID

Answer 5

If you like to see total sales alongside, then you would use sum(sale_amt), and in the group by add the sale_amt. I hope it helps.