Mysql select 查询计数和 Distinct 无法正常工作

Question

I am developing an eCommerce website using Laravel 8. I write the following script for find out total price & total quantity under a single order number. From following script getting the ERROR where is the problem please help me.
*At first I write row mysql then i will convert laravel query Builder.

SELECT COUNT (total_price) as totaPrice, COUNT (productqty) as proQnty
FROM (SELECT DISTINCT order_id FROM orderDetails)
LEFT JOIN ordertbl 
ON ordertbl.id = orderDetails.order_id;

Answer 1

In Your raw in missing the tablename alis for the subquery.. Your raw query should be

SELECT COUNT(total_price) as totaPrice, COUNT(productqty) as proQnty
FROM (
    SELECT DISTINCT order_id FROM orderDetails
) T 
LEFT JOIN ordertbl ON ordertbl.id = T.order_id;

Answer 2

I guess you want to sum the prices and quantities, so use SUM() aggregate function.
Also you should do a LEFT join of ordertbl to orderDetails and not the other way around:

SELECT ot.id,
       SUM(od.total_price) AS totaPrice, 
       SUM(od.productqty) AS proQnty
FROM ordertbl ot LEFT JOIN orderDetails od
ON ot.id = od.order_id
WHERE ot.id = ?
GROUP BY ot.id;

Or, without a join:

SELECT SUM(total_price) AS totaPrice, 
       SUM(productqty) AS proQnty
FROM orderDetails 
WHERE order_id = ?;

Replace ? with the id of the order that you want.