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Need help on query when sum of total show inaccurate result


Need help on query when sum of total show inaccurate result

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testingpoke1
testingpoke1
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SELECT id_product, SUM(COALESCE(received_qty, ordered_qty)) AS total
FROM (Select id_department,id_product,received_qty, ordered_qty from
(SELECT * FROM cart_item WHERE id_cart IN (SELECT id_cart FROM purchase)) AS c
LEFT JOIN Purchase p on p.id_cart = c.id_cart ) as Z
GROUP BY id_product

http://sqlfiddle.com/#!9/58cdd3/1

I am trying to get the total sum of qty from ordered_qty and received_qty, but it only sum the id_cart = 1 and ignored other id_cart.

What's wrong with my query? Thanks.

expected output : show total of quantity based on id_product from different purchase.


Sean Lange
Sean Lange
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In your sql fiddle it has two rows in the result product id 1 and 2. I would also point out that your sql fiddle is created for mysql. This is a sql server forum.

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testingpoke1
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Sorry, but it is missing product id 3.
Sean Lange
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What are you trying to accomplish? Your query seems overly complicated for the output you are receiving.

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Not really sure what you are trying to do here but I think you could simplify your query to something like this.


select id_product
, Total = SUM(COALESCE(received_qty, ordered_qty))
from Cart_Item
group by id_product



You were not seeing id_product 3 in your results because you have no purchase for id_cart of 2.

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testingpoke1
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I am doing analysis for the quantity of product purchased. I have few table to join to get other details from the table. As you can see from the sql fiddle, i am trying to sum the quantity of product received, and if quantity received is null then will get the value of ordered quantity. The output show is incorrect since it only shows me the id cart = 1. By right i want it to show both cart id 1 and 2 and sum of quantity of product id..
Sean Lange
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testingpoke1 - Tuesday, November 28, 2017 8:05 AM
I am doing analysis for the quantity of product purchased. I have few table to join to get other details from the table. As you can see from the sql fiddle, i am trying to sum the quantity of product received, and if quantity received is null then will get the value of ordered quantity. The output show is incorrect since it only shows me the id cart = 1. By right i want it to show both cart id 1 and 2 and sum of quantity of product id..


Well look at your query (which is way more complicated than it needs to be). You have:


SELECT * FROM cart_item WHERE id_cart IN (SELECT id_cart FROM purchase)


This by definition will prevent id_product 3 from appearing in your results because you do not have a row in the purchase table for id_cart 2. I am willing to help you but you have to explain what it is you are trying to do here.

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testingpoke1
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Process: - When user buy item and check out then there's cart and cart items table to store the transaction.
- 1 cart_id have many item which stored in cart items table.
- After purchase succeed, then will generate a purchase order id and stored in purchase order table .
- In purchase order table, id_cart and status will be stored.

From here, i am trying to calculate quantity based on id_product or id branch or etc from the purchase made.
There is receiving and ordered quantity field, which in some cases quantity received field might be null, so i will take ordered quantity value.

cart item table

cart table

purchase order table

Sean Lange
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testingpoke1 - Tuesday, November 28, 2017 8:31 AM
Process: - When user buy item and check out then there's cart and cart items table to store the transaction.
- 1 cart_id have many item which stored in cart items table.
- After purchase succeed, then will generate a purchase order id and stored in purchase order table .
- In purchase order table, id_cart and status will be stored.

From here, i am trying to calculate quantity based on id_product or id branch or etc from the purchase made.
There is receiving and ordered quantity field, which in some cases quantity received field might be null, so i will take ordered quantity value.



So why do you think id_product 3 should be in your results? You have no row in the purchase table for id_cart 2.

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J Livingston SQL
J Livingston SQL
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just a thought....it may help explain

SELECT c.id_product,
SUM(COALESCE(c.received_qty, c.ordered_qty)) AS Total,
c.id_cart,
p.id_purchase,
p.id_department
FROM Cart_Item AS c
LEFT OUTER JOIN Purchase AS p ON c.id_cart = p.id_cart
GROUP BY c.id_product,
c.id_cart,
p.id_purchase,
p.id_department;


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