SQL 开发人员在创建视图时重复列名

Question

我在下面指定 运行 语句时遇到此错误

ORA-00957: duplicate column name
00957. 00000 - "duplicate column name"

我的查询：

create view vw_sales_may 
as 
    select 
        customers.id, orderdetails.id, sales.sale_date, sales.total_value 
    from 
        customers 
    inner join 
        sales on customers.id = sales.customer_id 
    join 
        orderdetails on orderdetails.customer_id = customers.id 
    where 
        to_char(sale_date, 'MM') = 05;

Answer 1

只需要添加列别名。

create view vw_sales_may as 
select customers.id as CustomerID, 
orderdetails.id as OrderDetailsID, 
sales.sale_date, 
sales.total_value 
from customers 
inner join sales on customers.id = sales.customer_id 
join orderdetails on orderdetails.customer_id = customers.id 
where to_char(sale_date,'MM') = 05;