Question

我需要帮助找出我的电子商务网站的SQL查询

有Users（customers / customer-service-reps）表

有Orders表

有Line-Items（列是制造商，数量，等）表

用户拥有多个订单，订单包含多个订单项。

我正在尝试查找已提出1个或更多订单的用户列表，其中包含来自（＆＃39; X-Parts＆＃39;＆lt; - 制造商名称）的商品

非常感谢任何帮助

Answer 1

试试这个

SELECT U.UserID, COUNT(O.OrderID) OrderCount
FROM Users U INNER JOIN Orders O ON U.UserID = O.UserID
             INNER JOIN Line-Items L ON O.OrderID = L.OrderID
Where L.manufacturer = 'X-Parts'
Group BY U.UserID
Having count(O.orderID) >= 1

示例演示： - http://sqlfiddle.com/#!3/f1712/2

Answer 2

Its one or more orders.

SELECT U.UserID, COUNT(O.OrderID) as OrderCount
FROM Users U 
INNER JOIN Orders O ON U.UserID = O.UserID
INNER JOIN Line-Items L ON O.OrderID = L.OrderID
Where L.manufacturer = 'X-Parts'
Group BY U.UserID
Having count(O.orderID) >= 1

对具有一对多关系的3个表的SQL查询

2 个答案: