Question

我正在尝试获取订单报告，不仅返回客户的订单总数，还包含三个附加字段，包含第一个和最后一个订单的日期，以及第一个和最后一个订单之间的范围（以天为单位）

以下查询

SELECT customers.name, 
   customers.customer_id, 
   COUNT(orders.order_id) AS Orderscount 
   FROM customers 
   JOIN orders ON customers.customer_id = orders.customer_id 
   GROUP BY customers.name,
            customers.customer_id                       
         HAVING Orderscount >= 2  
         ORDER BY Orderscount DESC

返回一个名称为customer_id的表格，以及订单总数。

问题是，如何添加到此查询中以获取first_order，last_order和两者之间的日期范围的日期？

我正在使用SQLite。

Answer 1

使用MIN和MAX获取第一个和最后一个订单日期，使用julianday()计算范围：

SELECT customers.name, 
   customers.customer_id, 
   COUNT(orders.order_id) AS Orderscount,
   MIN(col_name) AS firstOrder,
   MAX(col_name) AS lastOrder,
   ROUND(julianday(MAX(col_name)) - julianday(MIN(col_name))) AS range
FROM customers 
JOIN orders ON customers.customer_id = orders.customer_id 
GROUP BY customers.name,
         customers.customer_id                       
HAVING Orderscount >= 2  
ORDER BY Orderscount DESC

订单日期范围为

1 个答案: