PHP / MYSQL计数订单

Question

订单表：

Order_items表：

用户表：

$sql[2] = "SELECT u.name, COUNT(o.user_id) AS order_count, (oi.quantity * p.price) AS total_price FROM users AS u
        INNER JOIN orders AS o ON u.id = o.user_id
        INNER JOIN order_items AS oi ON oi.order_id = o.id
        INNER JOIN products AS p ON p.id = oi.product_id
        GROUP BY u.name
        ORDER BY ertek DESC";

我想要计算每个用户的订单数量。示例：像托马斯有3个订单，但我的代码是写1，我想写托马斯（3）。花了多少钱，但这个工作正常。知道怎么解决吗？

Answer 1

对于您要求的内容，查询应如下所示：

SELECT u.name,
       COUNT(DISTINCT o.id) as order_count,
-------------^
       SUM(oi.quantity * p.price) as total_price
-------^
FROM users u INNER JOIN
     orders o
     ON u.id = o.user_id INNER JOIN
     order_items oi
     ON oi.order_id = o.id INNER JOIN
     products p
     ON p.id = oi.product_id
GROUP BY u.name
ORDER BY order_count DESC;  -- I assume `ertek` is just a translation issue

我突出了重要的变化。

Answer 2

您可以尝试以下查询。

select u.name, (select count(*) from orders o where o.user_id=u.id) as 
order_count, (select sum(oi.quantity * p.price) from orders AS o INNER 
JOIN order_items AS oi ON oi.order_id = o.id INNER JOIN products AS p ON
p.id = oi.product_id where o.user_id=u.id) as total_price from users u

可能会对你有帮助。