Question

I am trying to write an SQL statement that will calculate the total value of a purchase order.

Example time!

SELECT PO_Number, LineItem, Quantity, Cost
FROM POs

Say on PO_Number=484 there are 2 units of LineItem-1 at $2 each. There are also 3 units of LineItem-2 at $5 each. Is there a way to output $19? (2 + 2 + 3 + 3 + 3 = 19)

Answer 1

SELECT SUM(Quantity*Cost) WHERE PO_Number = 484;

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UPDATE

If you want to show the totals for multiple purchase orders, you need to “group” your results by purchase order:

SELECT SUM(Quantity*Cost)
WHERE PO_Number IN (484,485,486) -- if you want specified ones only, omit for all
GROUP BY PO_Number;