How to use aggregate SUM function on result of SUM in INNER JOIN?

This is my SQL query which joins two tables:

SELECT `o`.`orderID`, SUM(i.partialAmount) AS `amount` FROM `OrderTable` AS `o` INNER JOIN `Item` AS `i` ON i.orderID = o.orderID GROUP BY `o`.`orderID`

Items are connected to orders via 1-to-many relationship. Each item has a partialAmount column and I am adding up those partial amounts to get a total amount per each order.

I would like to get a total amount for all orders though, how to do that?

So I would like something like: SUM(amount) AS totalAmount but this doesn't work:

SELECT `o`.`orderID`, SUM(i.partialAmount) AS `amount`, SUM(amount) AS `totalAmount` FROM `OrderTable` AS `o` INNER JOIN `Item` AS `i` ON i.orderID = o.orderID GROUP BY `o`.`orderID`

I don't want to use WITH ROLLUP - because I don't want an extra row.

Expected output:

----------------------------------------------------------------------- | orderID | amount | totalAmount | ----------------------------------------------------------------------- | 1 | 2 | 5 | ----------------------------------------------------------------------- | 2 | 3 | 5 | -----------------------------------------------------------------------


If all you want is a total line, you can do something like this code. There are other approaches as well, depending on how if you need to filter the selected orders

SELECT `o`.`orderID`, SUM(i.partialAmount) AS `amount` FROM `OrderTable` AS `o` INNER JOIN `Item` AS `i` ON i.orderID = o.orderID GROUP BY `o`.`orderID` UNION SELECT 999999,sum(i.partialAmount) as 'Amount' FROM Item i


This will be a hit on performance (and assumes that every row from Item has an order):

SELECT `o`.`orderID`, SUM(i.partialAmount) AS `amount`, (SELECT SUM(partialAmount) FROM `Item`) TotalAmount FROM `OrderTable` AS `o` INNER JOIN `Item` AS `i` ON i.orderID = o.orderID GROUP BY `o`.`orderID`


I'd highly advise doing this kind of thing in the application rather than SQL as it is repitition of work, but it can be achieved as follows:

SELECT OrderTable.OrderID, SUM(PartialAmount) AS Amount, TotalAmount FROM OrderTable, Item, (SELECT SUM(PartialAmount) AS TotalAmount FROM Item) AS total WHERE Item.OrderID = Ordertable.OrderID GROUP BY OrderTable.OrderID, TotalAmount

I can't check the execution plan to compare this to the option of the Subselect posted in another answer by Lamak, but SQL Server definitely optimises the cross apply much better than the subselect.


If you want the total value on every line you could use sum() over function which would give you both totals http://msdn.microsoft.com/en-us/library/ms189461.aspx

for running total

sum(amount) over ()

for partial total

sum(amount) over (partition by o.orderid)

would look like this

SELECT distinct `o`.`orderID`, SUM(i.partialAmount) over (partition by orderid) AS `amount`, SUM(i.partialAmount) over () AS `totalAmount` FROM `OrderTable` AS `o` INNER JOIN `Item` AS `i` ON i.orderID = o.orderID


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