MYSQL：View语句产生不正确的SUM总计

Question

I have 3 tables. A table for product prices, invoiced products, and ordered products. I am trying to create a view that joins these. I want to output the product prices with a total of invoiced products and a total of ordered products.

products_price

id  season_id   product_id  product_price
1   1           1           3.99
2   1           2           6.99
3   1           3           5.99
4   1           4           5.99
....

invoices_products

id  season_id   invoice_id  product_id  piece_qty
1   1           1           1           1600
2   1           2           2           3200
3   1           3           2           200
4   1           4           1           120 
....

orders_products

id  season_id   order_id    product_id  piece_qty
1   1           1           1           160
2   1           2           1           40
3   1           2           2           20
4   1           3           2           10
....

---

Here are a few queries from the View statements I've tried so far.

This query gives me everything I want. The View's output is perfect but the SUM() for the first 2 rows is off. total_invoice_product is double for row 1 and 2. total_order_product is 4x for row 1 and 3x for row 2.

Statement 1:

SELECT 
    `t1`.`id` AS `id`,
    `t1`.`season_id` AS `season_id`,
    `t1`.`product_id` AS `product_id`,
    `t1`.`product_piece_price` AS `product_piece_price`,
    SUM(`t2`.`piece_qty`) AS `total_invoice_product`,
    SUM(`t3`.`piece_qty`) AS `total_order_product`
FROM
    ((`products_price` `t1`
    LEFT JOIN `invoices_products` `t2` ON (((`t2`.`product_id` = `t1`.`product_id`)
        AND (`t2`.`season_id` = `t1`.`season_id`))))
    LEFT JOIN `orders_products` `t3` ON (((`t3`.`product_id` = `t1`.`product_id`)
        AND (`t3`.`season_id` = `t1`.`season_id`))))
GROUP BY `t1`.`season_id` , `t1`.`product_id`

This query gives me the output that I expect. Its not the full output I want but its correct for the statement. The SUM() totals are off on this one as well.

Statement 2:

SELECT 
    `t1`.`id` AS `id`,
    `t1`.`season_id` AS `season_id`,
    `t1`.`product_id` AS `product_id`,
    `t1`.`product_price` AS `product_price`,
    SUM(`t2`.`piece_qty`) AS `total_invoice_product`,
    SUM(`t3`.`piece_qty`) AS `total_order_product`
FROM
    ((`products_price` `t1`
    LEFT JOIN `invoices_products` `t2` ON ((`t2`.`product_id` = `t1`.`product_id`)))
    LEFT JOIN `orders_products` `t3` ON ((`t3`.`product_id` = `t1`.`product_id`)))
WHERE
    ((`t2`.`season_id` = `t1`.`season_id`)
        AND (`t2`.`product_id` = `t1`.`product_id`))
GROUP BY `t1`.`season_id` , `t1`.`product_id`

---

the output I want

id  season_id   product_id  product_price   total_invoice   total_order
1   1           1           3.99            1720            200
2   1           2           6.99            3400            30
3   1           3           5.99            576 
4   1           4           5.99            800 

output received for statement 1

id  season_id   product_id  product_price   total_invoice   total_order
1   1           1           3.99            3440            800
2   1           2           6.99            6800            90
3   1           3           5.99            576 
4   1           4           5.99            800 

output received for statement 2

id  season_id   product_id  product_price   total_invoice   total_order
1   1           1           3.99            3440            800
2   1           2           6.99            6800            90

I can build a query like below and it works perfect. I get the exact output I need but this code does not work as a view. I get this error: ERROR 1349: View's SELECT contains a subquery in the FROM clause SQL Statement

Perfect Query but will not work as a view

SELECT 
    products_price.id,
    products_price.season_id,
    products_price.product_id,
    products_price.product_price,
    invoices_grouped.total_invoice_product,
    orders_grouped.total_order_product
FROM
    products_price
LEFT JOIN
    (SELECT 
        invoices_products.product_id,
        invoices_products.season_id,
        SUM(invoices_products.piece_qty) AS total_invoice_product
    FROM
        invoices_products
    GROUP BY 
        invoices_products.product_id) AS invoices_grouped 
    ON 
        invoices_grouped.product_id = products_price.product_id
    AND
        invoices_grouped.season_id = products_price.season_id
LEFT JOIN
    (SELECT 
        orders_products.product_id,
        orders_products.season_id,
        SUM(orders_products.piece_qty) AS total_order_product
    FROM
        orders_products
    GROUP BY 
        orders_products.product_id) AS orders_grouped
    ON 
        orders_grouped.product_id = products_price.product_id
    AND
        orders_grouped.season_id = products_price.season_id

What I need

I've tried several other statements. They either got worse results or the same. Can someone help me get Statement 1 working with a proper SUM?

Edit 1 for a question

The information that this view provides will be called upon a lot. The products_price and invcoices_products tables will not be changed that often. orders_products will be changed a lot. If 2 views are required, would it be more efficient to use the "Perfect" query above or use 2 views?

Edit 2 for another query

Here is another query from my view statement. This query is part of Statement 1 shown above. This query works perfect but it is not complete. I need the second SUM column. When you add the second LEFT JOIN it breaks the SUM totals.

SELECT 
    `t1`.`id` AS `id`,
    `t1`.`season_id` AS `season_id`,
    `t1`.`product_id` AS `product_id`,
    `t1`.`product_piece_price` AS `product_piece_price`,
    SUM(`t2`.`piece_qty`) AS `total_invoice_product`
FROM
    (`products_price` `t1`
    LEFT JOIN `invoices_products` `t2` ON (((`t2`.`product_id` = `t1`.`product_id`)
        AND (`t2`.`season_id` = `t1`.`season_id`))))
GROUP BY `t1`.`season_id` , `t1`.`product_id`

output

id  season_id   product_id  product_price   total_invoice   
1   1           1           3.99            1720            
2   1           2           6.99            3400            
3   1           3           5.99            576 
4   1           4           5.99            800 

Answer 1

Well, MySql has some limitations, so you will need to create 2 views for subqueries and use them:

create view viewInvoices
as
select season_id, product_id, sum(piece_qty) pq 
from invoices_products group by season_id, product_id

create view viewOrders
as
select season_id, product_id, sum(piece_qty) pq 
from orders_products group by season_id, product_id

select pp.id, 
       pp.season_id, 
       pp.product_id, 
       pp.product_price, 
       i.pq as total_invoice, 
       o.pq as total_order
from products_price pp

left join viewInvoices as i 
           on pp.season_id = i.season_id and pp.product_id = i.product_id

left join viewOrders as o 
           on pp.season_id = o.season_id and pp.product_id = o.product_id

Answer 2

试试这个查询

SELECT * from products_price as a left join (select product_id, sum(piece_qty)total_invoices from invoices_products group by product_id) as b on a.product_id=b.product_id left join (select product_id, sum(piece_qty) as total_order from orders_products group by product_id) as c on a.product_id=c.product_id