Can we use aggregate of 2 tables in a single query?

Hi people,

I have a query that goes like this:

Select
Items.1,
Items.2, etc.
Sum (Stock.1),
Sum (Orders.1)
Of
Items, Stock, orders
Where
Items.ID = Stock.ID - (1 to many relationship)
AND
Items.ID = Orders.ID - (1 to many relationship)
Group By
Items.1,
Items.2, etc.
Order by
Items.ID

The idea is that against every item in stock, I should get to total the current level of stocks and inventories of the element 'custom '. In case someone wandering stock are calculated by the movements of stock - in and out - so the "Sum (Stock.1)" is actually a compound essentially statement Sum (stock_In) - Sum (stock_out) (who normally works OK as below)

If I remove the ' table and the columns of the order, I get the right total stock - Sum (Stock.1)
However, the second adding 'Sum' on the table 'Orders' then the two sums give incorrect results (result of Cartesian type)
Similarly, leaving in the 'orders' and removing the 'Stocks' statements give the correct sum of the 'orders '.

So either I'm doing something wrong or does not have two functions aggreagte on different tables in SQL.

If we can not use 2 aggregates of separate tables in a simple SQL query, is there another way to make this request?

Thanks in anticipation!

Hello

When you have two (or more) a one-to-many relationship, you need to aggregate each in a separate query.
For example, you can aggregate the orders in a subquery (ordes_summary, below) and combine the stock in the main query, like this:

WITH     orders_summary     AS
(
     SELECT       id
     ,       SUM (col_1)     AS orders_total
     FROM       orders
     GROUP BY  id
)
SELECT       i.col_1
,       i.col_2
,       SUM (s.col_1)          AS stock_total
,       MAX (o.orders_total)     AS orders_total
FROM       items            i
,       stock            s
,       orders_summary  o
WHERE       i.id     = s.id
AND       i.id     = o.id
GROUP BY  i.col_1
,       i.col_2
ORDER BY  i.col_1
,       i.col_2
;

I hope that answers your question.
If this isn't the case, post some sample data and desired results based on these data, as suggested Anurag.

Tags: Database

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