MySql 查询为客户选择总订单

Question

标题并不能很好地描述我需要从查询中得到什么。

@sgeddes 帮助我提出了以下查询，但查询需要进行一些更改才能满足我的需求。我还稍微修改了查询以不选择已删除的客户，但由于此查询的编写方式超出了我的 SQL 知识范围，我无法进行太大更改。

SELECT  d.customer_id,d.fname,d.lname,d.isactive,
        o.lastdate, 
        Count(o2.order_id) AS 'total_orders'
 FROM   customers d
        LEFT JOIN (SELECT MAX(order_id) order_id, customer_id
              FROM   orders 
              GROUP BY customer_id) m on d.customer_id = m.customer_id
        LEFT JOIN orders o on m.order_id = o.order_id
        LEFT JOIN orders o2 on d.customer_id = o2.customer_id 
                           AND o2.balance > 0 AND o2.isActive > -1
 WHERE  d.user_id =945766  AND d.isActive > -1 
        AND o2.customer_id IS NULL
GROUP BY d.customer_id

我需要以下三个条件。

1. isActive > -1 的客户订单计数（-1 = 已删除）
2. 客户不在订单表中（没有订单的客户）。
3. isActive = 0 的客户及其对应的订单数

简而言之，我只需要 isActive = 0 的客户，并为 total_orders 列获得实际的 #。

为了更好地帮助您理解我的要求，我创建了一个 SqlFiddle。

Please see my SqlFiddle

Answer 1

如果您的要求是您在 3 点中提到的，那么您可以使用以下查询-

如果您想要单独的查询，请使用下面-

SELECT d.customer_id, d.fname, COUNT(o.order_id) AS Total_Orders
FROM customer d 
LEFT JOIN orders o ON d.customer_id=o.customer_id 
WHERE d.isActive > -1
GROUP BY d.customer_id;

SELECT DISTINCT d.customer_id, d.fname 
FROM customer d 
LEFT JOIN orders o ON d.customer_id=o.customer_id 
WHERE o.customer_id IS NULL;

SELECT d.customer_id, d.fname, COUNT(o.order_id) AS Total_Orders
FROM customer d 
LEFT JOIN orders o ON d.customer_id=o.customer_id 
WHERE d.isActive = 0 
GROUP BY d.customer_id;

如果您想通过联合合并它们，请使用下面-

SELECT 'isactive>-1' AS 'status', d.customer_id, d.fname, COUNT(o.order_id) AS Total_Orders
FROM customer d 
LEFT JOIN orders o ON d.customer_id=o.customer_id 
WHERE d.isActive > -1
GROUP BY d.customer_id 
UNION ALL
SELECT DISTINCT 'Customer without Order' AS 'status', d.customer_id, d.fname, COUNT(o.order_id) AS Total_Orders 
FROM customer d 
LEFT JOIN orders o ON d.customer_id=o.customer_id 
WHERE o.customer_id IS NULL 
UNION ALL
SELECT 'isactive=0' AS 'status', d.customer_id, d.fname, COUNT(o.order_id) AS Total_Orders
FROM customer d 
LEFT JOIN orders o ON d.customer_id=o.customer_id 
WHERE d.isActive = 0 
GROUP BY d.customer_id;

注意：您的主要查询是尝试获取可用于任何其他目的的最新订单，因此，如果您提供与您的确切要求不同的确切要求，那么有人可以帮助您。