MySQL stored procedure architecture - mysql

Question

I am working on a piece of code that runs a query against MySQL. The syntax is below:
SELECT `order`.`id` AS `id`,
IFNULL(product.main_name, product.name) AS `variant`,
`product`.`id` AS `product_id`,
`product`.`cost` AS `cost`,
ROUND(SUM(order.price), 2) AS `price`,
SUM(order.quantity) AS `quantity`,
`product`.`sku` AS `sku`,
ROUND(order.price/order.quantity, 2) AS `avg_price`,
`product`.`quantity` AS `qty_at_hand`,
`order`.`fulfillment_channel` AS `fulfillment_channel`,
0 as `returns`
FROM `order`
LEFT JOIN `product` ON product.sku = order.sku
WHERE (`order`.`account_id`=1)
AND (`order`.`item_status`<>'Cancelled')
AND (`order`.`purchase_date` >= $start_date)
AND (`order`.`purchase_date` <= $end_date)
GROUP BY `order`.`sku`
My order table:
| id | int(11) | NO | PRI | NULL | auto_increment |
| user_id | int(11) | NO | MUL | NULL | |
| account_id | int(11) | NO | MUL | NULL | |
| merchant_order_id | varchar(255) | NO | | NULL | |
| purchase_date | datetime | NO | | NULL | |
| updated_date | datetime | NO | | NULL | |
| order_status | varchar(255) | NO | | NULL | |
| product_name | varchar(255) | NO | | NULL | |
| sku | varchar(255) | NO | MUL | NULL | |
| item_status | varchar(255) | NO | | NULL | |
| quantity | int(11) | NO | | NULL | |
| currency | varchar(10) | NO | | NULL | |
| price | decimal(9,2) | YES | | 0.00 | |
| created_at | datetime | NO | | CURRENT_TIMESTAMP | |
| fulfillment_channel | varchar(255) | YES | | NULL | |
My product table:
| id | int(11) | NO | PRI | NULL | auto_increment |
| user_id | int(11) | NO | MUL | NULL | |
| account_id | int(11) | NO | MUL | NULL | |
| name | varchar(255) | NO | | NULL | |
| main_name | varchar(255) | YES | | NULL | |
| description | text | YES | | NULL | |
| listing_id | varchar(255) | YES | | NULL | |
| sku | varchar(255) | NO | MUL | NULL | |
| open_date | datetime | YES | | NULL | |
| price | decimal(9,2) | NO | | 0.00 | |
| quantity | int(11) | YES | | NULL | |
| supplier_id | int(11) | YES | | NULL | |
| active | tinyint(1) | NO | | 1 | |
| supplier_sku | varchar(255) | YES | | NULL | |
| upc | varchar(255) | YES | | NULL | |
| tag | varchar(255) | YES | | NULL | |
| cost | decimal(9,2) | NO | | 0.00 | |
| ean | int(11) | YES | | NULL | |
| min_order_qty | int(11) | YES | | NULL | |
The query is working fine. However, I would like to replace the QUERY with a stored procedure - a function would take three (3) arguments: start_date, end_date and a boolean flag called full.
I would like the full to be interpreted in a the following way:
- if full is set to false, return the same results query returns now;
- if full is set to true, return a row for each entry in the products table with quantity, price and average price returned as 0, if where fails merged with the query results - a row for each product, whether where were orders in the set period or not.
I was thinking about making a temporary table, then running an update on it and dumping the table after the data has been returned?
What would be the correct way to approach this?
Thank you

Answer 1

Add a UNION to this query and have it do an LEFT OUTER JOIN from Products to Orders table and in the WHERE clause check for full = true and only look for rows with Order.id is NULL. Union would only bring rows when full = true.
Prepare data in SELECT as you specified.