Question

我的SQL数据库中有一个资源和一个订单表，我有以下SQL查询：

Select resource.id, resource.name from resource
inner join orders on orders.res_id = resource.id 
where orders.markup < 1000 and 
resource.id = 100

此工作正常，并在我的视图中显示已过滤的ID和NAME字段。但是，我还想在视图中看到orders.markup列。我尝试了以下方法：

Select resource.id, resource.name, orders.* from resource, orders 
inner join orders on orders.res_id = resource.id 
where orders.markup < 1000 and 
resource.id = 100

这失败了：

ORA-00904: "RESOURCE"."ID": invalid identifier

Answer 1

试试这个：

Select resource.id, resource.name, orders.markup from resource
inner join orders on orders.res_id = resource.id 
where orders.markup < 1000 and 
resource.id = 100

Answer 2

您的代码中存在错误 - 您使用资源，订单同时使用内部联接...从查询中删除，订单，反之亦然 - 删除内部联接

样品：

create table "resource" (id integer, name varchar2(50));
create table orders (res_id int, markup integer, name varchar2(50));

select res.id, res.name, orders.* 
from "resource" res 
inner join orders on orders.res_id = res.id
where orders.markup < 1000 and 
res.id = 100

SQL：显示2个表中的列

2 个答案: