Product database - MySQL query with multiple JOINs - mysql

Question

First, my table structure:
Products Table:
`id` int(11) NOT NULL AUTO_INCREMENT,
`title` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`price` decimal(10,2) NOT NULL,
`list_price` decimal(10,2) NOT NULL,
`brand` int(11) NOT NULL,
`category` int(11) NOT NULL,
`image` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`description` text COLLATE utf8_unicode_ci NOT NULL,
`featured` tinyint(4) NOT NULL DEFAULT '0',
`deleted` tinyint(4) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`)
Categories Table:
`id` int(11) NOT NULL AUTO_INCREMENT,
`category` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`parent` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`)
Brand Table:
`id` int(11) NOT NULL AUTO_INCREMENT,
`brand` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`)
Stock Table:
`id` int(11) NOT NULL AUTO_INCREMENT,
`product_id` int(11) NOT NULL,
`size` varchar(4) COLLATE utf8_unicode_ci NOT NULL,
`stock` int(11) NOT NULL,
`sold` int(11) NOT NULL,
`reserved` int(11) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `product_sizes` (`product_id`,`size`),
KEY `product_id` (`product_id`),
CONSTRAINT `stock_ibfk_1` FOREIGN KEY (`product_id`) REFERENCES `products` (`id`)
I wanted a single SQL query that grabs all the products by whatever criteria, and adds the total stock and total sold from the STOCK table, the brand name from the BRAND table, the child and parent categories from the CATEGORY table.
This was my attempt, which doesn't work:
"SELECT
a.title,
COALESCE(SUM(e.stock),0),
COALESCE(SUM(e.sold),0),
a.price,
c.category AS 'parent',
d.category AS 'child',
b.brand,
a.featured
FROM
products a
JOIN brand b
ON a.brand = b.id
JOIN categories c
ON a.category = c.id
LEFT JOIN categories d
ON c.parent = d.id
JOIN stock e
ON a.id = e.product_id
WHERE a.deleted = 0 ORDER BY a.title ASC"
Initially I had a series of queries instead - first getting all the products, then grabbing the categories, then the brands, then the stock/sold. I'm just wondering if I can do it all in the one query?
I am quite new at SQL.

Answer 1

Thanks to #Shadow, this is the query I needed, which works great:
SELECT
a.id,
a.title,
COALESCE(SUM(e.stock),0) AS 'stock',
COALESCE(SUM(e.sold),0) AS 'sold',
a.price,
c.category AS 'child_category',
d.category AS 'parent_category',
b.brand,
a.featured
FROM
products a
JOIN brand b
ON a.brand = b.id
JOIN categories c
ON a.category = c.id
LEFT JOIN categories d
ON c.parent = d.id
JOIN stock e
ON a.id = e.product_id
WHERE a.deleted = 0
GROUP BY a.id, a.title, a.price, c.category, d.category, b.brand, a.featured ORDER BY a.title ASC