Gouping and suming multiple columns - mysql

Question

I have a two tables one is products that has productid, productname, customerid1 and quantity
and another customers table that has customerid2,customername and dates
what i want to do is collect all the customerid2 from customers table between two dates.
then match those ids to customerid1 in the products table with a join.
then group all the products by name sum their quantity,
then group all the customers by name for each product and sum their total quantity.
edit: I could use a subquery if necessary or seperate queries entirely. whatever works
**customers**
Column , Column, Column
customerid2:1, name:jon, date:2020
customerid2:2, name:steve, date:2020
customerid2:3, name:ted, date:2020
customerid2:4, name:ned, date:2020
**products**
Column , Column , Column , Column
productid:3 , productname:car, customerid1:1, qty,5
productid:3 , productname:car, customerid1:2, qty,5
productid:1 , productname:boat, customerid1:3, qty,1
productid:1 , productname:boat, customerid1:4, qty,2
productid:3 , productname:car, customerid1:1, qty,5
the final output should be:
car total:15
customer id:1 name:jon qty:10
customer id:2 name:steve qty:5*
boat total:3
customer id:3 name:ted qty:1
customer id:4 name:ned qty:2
my code:
$sql = SELECT customerid2, name, date, productname, SUM(qty)
FROM customers
JOIN ON customerid2 = customerid1
WHERE date BETWEEN '2019' AND '2020'
GROUP BY productid, customerid2
ORDER BY qty

Answer 1

Mysql can't make such an output, but on application level you can use this query, to buld what ever you need
This query:
SELECT
c.customerid2, c.name,p.productname,SUM(qty) total, p1.total_sum
FROM customer c inner JOIN products p ON c.customerid2 = p.customerid1
inner Join (SELECT productid, SUM(qty) total_sum FROM products GROUP BY productid) p1
ON p.productid = p1.productid
WHERE `date` BETWEEN '2019' AND '2020'
GROUP by c.customerid2, c.name,p.productid,p.productname
ORDER by total DESC;
To get a json object as you wanted you need this
SELECT
json_object('product', CONCAT( total_sum,' ',productname), 'customer',json_result) json_result
FROM
(SELECT
productname
,totaL_SUM
,JSON_ARRAYAGG(json_object('customerid', customerid2, 'name', name,'total', total)) json_result
FROM
(SELECT
c.customerid2, c.name,p.productname,SUM(qty) total, p1.total_sum
FROM customer c inner JOIN products p ON c.customerid2 = p.customerid1
inner Join (SELECT productid, SUM(qty) total_sum FROM products GROUP BY productid) p1
ON p.productid = p1.productid
WHERE `date` BETWEEN '2019' AND '2020'
GROUP by c.customerid2, c.name,p.productid,p.productname
ORDER by total DESC) t2
GROUP BY productname,total_sum) t3
CREATE TABLE products (
`productid` INTEGER,
`productname` VARCHAR(4),
`customerid1` INTEGER,
`qty` INTEGER
);
INSERT INTO products
(`productid`, `productname`, `customerid1`, `qty`)
VALUES
('3', 'car', '1', '5'),
('3', 'car', '2', '5'),
('1', 'boat', '3', '1'),
('1', 'boat', '4', '2'),
('3', 'car', '1', '5');
✓
✓
CREATE TABLE customer (
`customerid2` INTEGER,
`name` VARCHAR(5),
`date` INTEGER
);
INSERT INTO customer
(`customerid2`, `name`, `date`)
VALUES
('1', 'jon', '2020'),
('2', 'steve', '2020'),
('3', 'ted', '2020'),
('4', 'ned', '2020');
✓
✓
SELECT
c.customerid2, c.name,p.productname,SUM(qty) total, p1.total_sum
FROM customer c inner JOIN products p ON c.customerid2 = p.customerid1
inner Join (SELECT productid, SUM(qty) total_sum FROM products GROUP BY productid) p1
ON p.productid = p1.productid
WHERE `date` BETWEEN '2019' AND '2020'
GROUP by c.customerid2, c.name,p.productid,p.productname
ORDER by total DESC;
customerid2 | name | productname | total | total_sum
----------: | :---- | :---------- | ----: | --------:
1 | jon | car | 10 | 15
2 | steve | car | 5 | 15
4 | ned | boat | 2 | 3
3 | ted | boat | 1 | 3
SELECT json_object('product', CONCAT( total_sum,' ',productname), 'customer',
json_object('customerid', customerid2, 'name', name,'total', total)) json_result
FROM
(SELECT
c.customerid2, c.name,p.productname,SUM(qty) total, p1.total_sum
FROM customer c inner JOIN products p ON c.customerid2 = p.customerid1
inner Join (SELECT productid, SUM(qty) total_sum FROM products GROUP BY productid) p1
ON p.productid = p1.productid
WHERE `date` BETWEEN '2019' AND '2020'
GROUP by c.customerid2, c.name,p.productid,p.productname
ORDER by total DESC) t2
| json_result |
| :-------------------------------------------------------------------------------- |
| {"product": "15 car", "customer": {"name": "jon", "total": 10, "customerid": 1}} |
| {"product": "15 car", "customer": {"name": "steve", "total": 5, "customerid": 2}} |
| {"product": "3 boat", "customer": {"name": "ned", "total": 2, "customerid": 4}} |
| {"product": "3 boat", "customer": {"name": "ted", "total": 1, "customerid": 3}} |
SELECT
json_object('product', CONCAT( total_sum,' ',productname), 'customer',json_result) json_result
FROM
(SELECT
productname
,totaL_SUM
,JSON_ARRAYAGG(json_object('customerid', customerid2, 'name', name,'total', total)) json_result
FROM
(SELECT
c.customerid2, c.name,p.productname,SUM(qty) total, p1.total_sum
FROM customer c inner JOIN products p ON c.customerid2 = p.customerid1
inner Join (SELECT productid, SUM(qty) total_sum FROM products GROUP BY productid) p1
ON p.productid = p1.productid
WHERE `date` BETWEEN '2019' AND '2020'
GROUP by c.customerid2, c.name,p.productid,p.productname
ORDER by total DESC) t2
GROUP BY productname,total_sum) t3
| json_result |
| :--------------------------------------------------------------------------------------------------------------------------------- |
| {"product": "3 boat", "customer": [{"name": "ned", "total": 2, "customerid": 4}, {"name": "ted", "total": 1, "customerid": 3}]} |
| {"product": "15 car", "customer": [{"name": "jon", "total": 10, "customerid": 1}, {"name": "steve", "total": 5, "customerid": 2}]} |
db<>fiddle here