Question

I have three tables:

• CustOrder: id, CreateDate, Status

• DenominationOrder: id, DenID, OrderID

• Denomination: id, amount

I want to create a view based upon all these tables but there should be an additional column i.e. Total should be there which can calculate the sum of the amount of each order.

e.g.

• order 1 total denominations 3, total amount = 250+250+250=750
• order 2 total denominations 2, total amount = 250+250=500

Is it possible?

Answer 1

I try to guess your table relations (and data too, you did not provide any sample):

SELECT co.id, 
       COUNT(do.DenID) AS `Total denominations`, 
       SUM(d.amount) AS `Total amount`
FROM CustOrder co
INNER JOIN DenominationOrder do ON co.id = do.OrderId
INNER JOIN Denomination d ON do.DenId = d.id
GROUP BY co.id