SQL query to retreive data from multiple tables

Question

This was the correct answer:

SELECT 
    p.product_name,
    coalesce((sum((i.time_paid is null and i.time_canceled is null and i.time_refunded is null) * it.line_total_price)), 0) due,
    coalesce((sum((i.time_paid is not null) * it.line_total_price)), 0) paid,
    coalesce((sum((i.time_canceled is not null) * it.line_total_price)), 0) canceled,
    coalesce((sum((i.time_refunded is not null) * it.line_total_price)), 0) refunded
FROM
    PRODUCT p
LEFT JOIN invoice_item it ON p.id = it.product_id
LEFT JOIN invoice i ON it.invoice_id = i.id
GROUP BY
    p.id, p.product_description

All i had to add with the current code was to add is null and * total_price.

Thanks!

Answer 1

I think that you want conditional aggregation. The logic is not very well specified (especially for the due column), but I assume this should be close to what you want:

select 
    p.description,
    coalesce(sum((i.time_paid is null and i.time_cancelled is null and i.time_refund is null) * ii.line_total_price)), 0) due,
    coalesce(sum((i.time_paid is not null) * ii.line_total_price)), 0) paid,
    coalesce(sum((i.time_cancelled is not null) * ii.line_total_price)), 0) cancelled,
    coalesce(sum((i.time_refunded is not null) * ii.line_total_price)), 0) refunded
from products p
left join invoice_item ii on ii.product_id = p.id
left join invoices i on i.id = ii.invoice_id
group by p.id, p.description

Answer 2

This should give you an idea of how to do it. You might need to fiddle around with the logic inside of the CASE statements so that it's correct, but it's a start:

DROP TABLE invoice_item;
DROP TABLE product;
DROP TABLE invoice;

CREATE TABLE product (
id int,
sku varchar(32),
product_name varchar(128),
product_description text,
current_price decimal(8,2),
quantity_in_stock int
);

CREATE TABLE invoice (
id int,
invoice_number varchar(255),
customer_id int,
user_account_id int, 
total_price decimal(8,2),
time_issued DATETIME,
time_due DATETIME,
time_paid DATETIME,
time_canceled DATETIME,
time_refunded DATETIME
);

CREATE TABLE invoice_item (
  id int,
  invoice_id int,
  product_id int,
  quantity int,
  price decimal(8,2),
  line_total_price decimal(8,2)
);


insert into product (id,sku,product_name,product_description,current_price,quantity_in_stock) VALUES
(1,10,'Product 1','Description for Product 1',65,122),
(2,11,'Product 2','Description for Product 2',98,51),
(3,12,'Product 3','Description for Product 3',45,34),
(4,13,'Product 4','Description for Product 4',25,393),
(5,14,'Product 5','Description for Product 5',95,74),
(6,15,'Product 6','Description for Product 6',45,40),
(7,16,'Product 7','Description for Product 7',62,154),
(8,17,'Product 8','Description for Product 8',80,0),
(9,18,'Product 9','Description for Product 9',20,281),
(10,19,'Product 10','Description for Product 10',170,0);


INSERT INTO invoice (id, invoice_number,customer_id,user_account_id, total_price,time_issued,time_due,time_paid) VALUES
(1,'800c8d2fc967fe',7,4,1436,'2019-07-20 15:05:07','2019-07-27 15:05:07','2019-07-25 21:24:12'),
(2,'b27502b9f81e9d',9,2,1000,'2019-07-20 15:07:11','2019-07-27 15:07:11','2019-07-20 15:10:32'),
(3,'6b6bcfd3dfcd9b',3,2,360,'2019-07-20 15:06:15','2019-07-27 15:06:15','2019-07-31 21:22:11');

INSERT INTO invoice (id, invoice_number,customer_id,user_account_id, total_price,time_issued,time_due) VALUES
(4,'2196vac9a0120ad',5,2,1675,'2019-07-20 15:06:34','2019-07-27 15:06:34');

INSERT INTO invoice (id, invoice_number,customer_id,user_account_id, total_price,time_issued,time_due,time_paid,time_canceled) VALUES
(5,'4440d698878af70',6,2,9500,'2019-07-20 15:06:42','2019-07-27 15:06:42',NULL,'2019-07-22 11:17:02');

INSERT INTO invoice (id, invoice_number,customer_id,user_account_id, total_price,time_issued,time_due,time_paid,time_canceled,time_refunded) VALUES
(6,'4320bcab8fc4322',4,2,150,'2019-07-20 15:08:15','2019-07-27 15:08:15','2019-07-27 13:42:45',NULL,'2019-07-27 14:11:20');

INSERT INTO invoice_item
(id,invoice_id,product_id,quantity,price,line_total_price) VALUES
(1,1,1,20,65,1300),
(2,1,7,2,62,136),
(3,1,5,10,100,1000),
(4,3,10,2,180,360),
(5,4,1,5,65,325),
(6,4,2,10,95,950),
(7,4,5,4,100,400),
(8,5,10,100,95,9500),
(9,6,4,6,25,150);


  SELECT 
    p.product_name,
    (COALESCE (SUM(CASE WHEN i.time_paid is null and i.time_canceled is null and i.time_refunded is null IS NOT NULL THEN it.quantity * it.price ELSE 0 END ),0)) as due,
    (COALESCE (SUM(CASE WHEN i.time_paid IS NOT NULL THEN it.quantity * it.price ELSE 0 END ),0)) as paid,
    (COALESCE (SUM(CASE WHEN i.time_canceled IS NOT NULL THEN it.quantity * it.price ELSE 0 END ),0)) as canceled,
    (COALESCE (SUM(CASE WHEN i.time_refunded IS NOT NULL THEN it.quantity * it.price ELSE 0 END ),0)) as refunded
FROM
    PRODUCT p
LEFT OUTER JOIN invoice_item it ON p.id = it.product_id
LEFT OUTER JOIN invoice i ON it.invoice_id = i.id
GROUP BY 
    product_name
ORDER BY 
    p.id ASC