Question

我正在尝试运行查询，其中收到客户的姓名，发货日期，订单日期以及延迟的天数。如果延迟的天数大于10天，它应该只显示所有这些。下面是我到目前为止的代码和结果。

唯一的问题是，应该只显示一行，但它会显示数据库中的每个客户。这似乎是一个简单的修复，但我无法弄清楚。任何帮助表示赞赏。感谢。

Execute:
select Customers.customerName as 'customer name',
shipdate.shippedDate as 'ship date',
shipdate.orderDate as 'order date',
datediff (shipdate.shippedDate, shipdate.orderDate) as 'days late'

from Customers join Orders 
on Customers.customerNumber = Orders.customerNumber


join Orders as shipdate join Orders as orderday 
on shipdate.shippedDate = orderday.shippedDate
where datediff (shipdate.shippedDate, shipdate.orderDate) > 10

    + ------------------ + -------------- + --------------- + -------------- +
| customer name      | ship date      | order date      | days late      |
+ ------------------ + -------------- + --------------- + -------------- +
| Online Diecast Creations Co. | 2003-12-26 00:00:00 | 2003-10-22 00:00:00 | 65             |
| Blauer See Auto, Co. | 2003-12-26 00:00:00 | 2003-10-22 00:00:00 | 65             |
| Vitachrome Inc.    | 2003-12-26 00:00:00 | 2003-10-22 00:00:00 | 65             |
| Baane Mini Imports | 2003-12-26 00:00:00 | 2003-10-22 00:00:00 | 65             |
| Euro+ Shopping Channel | 2003-12-26 00:00:00 | 2003-10-22 00:00:00 | 65             |
| Danish Wholesale Imports | 2003-12-26 00:00:00 | 2003-10-22 00:00:00 | 65             |
| Rovelli Gifts      | 2003-12-26 00:00:00 | 2003-10-22 00:00:00 | 65             |
| Land of Toys Inc.  | 2003-12-26 00:00:00 | 2003-10-22 00:00:00 | 65             |
| Cruz & Sons Co.    | 2003-12-26 00:00:00 | 2003-10-22 00:00:00 | 65             |

Answer 1

应该尝试这样的事情：

{{1}}

如何使用两个连接运行递归查询？

1 个答案: