如何解决每个派生表都必须有自己的别名？

Question

我有这个 sql 查询

Select parent_order_id,product_id,hub_id,cast(1- '0.05' * MONTHS_BETWEEN(SYSDATE(), order_processing_date)as unsigned) AS total_sum 
      FROM (select q1.parent_order_id, q1.product_id, q1.hub_id, q1.order_processing_date from (select o1.parent_order_id, 
            o2.product_id, o1.hub_id, o1.order_processing_date from licious.orders as o1 join licious.order_items as o2 on o1.order_id = o2.order_id 
            WHERE DATE(o1.order_processing_date) BETWEEN DATE(DATE_SUB(CURRENT_TIMESTAMP(), INTERVAL 90 day) )AND DATE(CURRENT_TIMESTAMP()) 
            AND  o1.status = "Delivered") as q1 
        join ((select o1.parent_order_id from licious.orders as o1 join licious.order_items as o2 on o1.order_id = o2.order_id 
              WHERE DATE(o1.order_processing_date) BETWEEN DATE(DATE_SUB(CURRENT_TIMESTAMP(), INTERVAL 90 day) )
              AND DATE(CURRENT_TIMESTAMP()) AND  o1.status = "Delivered" group by parent_order_id having count(parent_order_id > 1)
              )) as q2 on q1.parent_order_id = q2.parent_order_id)
            group by 
              parent_order_id, 
              product_id, 
              hub_id, 
              order_processing_date 
            order by 
              parent_order_id desc, 
              total_sum desc;

我收到错误，每个派生表都必须有自己的别名 我知道我需要使用别名，但我已经使用过它并且我不知道在哪里修改我的查询 任何人都可以检查整个查询并更新它。这将是一个很大的帮助。

Ps：我刚刚编辑了我的问题，因为前一个问题只是通过编写 UNSIGNED 而不是 int 解决了

Answer 1

您没有为外部查询提供别名：

Select parent_order_id,product_id,hub_id,cast(1- '0.05' * DATEDIFF(MONTH, SYSDATE(), order_processing_date)as unsigned) AS total_sum 
FROM (select q1.parent_order_id, q1.product_id, q1.hub_id, q1.order_processing_date from (select o1.parent_order_id, 
    o2.product_id, o1.hub_id, o1.order_processing_date from licious.orders as o1 join licious.order_items as o2 on o1.order_id = o2.order_id 
    WHERE DATE(o1.order_processing_date) BETWEEN DATE(DATE_SUB(CURRENT_TIMESTAMP(), INTERVAL 90 day) )AND DATE(CURRENT_TIMESTAMP()) 
    AND  o1.status = "Delivered") as q1 
join ((select o1.parent_order_id from licious.orders as o1 join licious.order_items as o2 on o1.order_id = o2.order_id 
      WHERE DATE(o1.order_processing_date) BETWEEN DATE(DATE_SUB(CURRENT_TIMESTAMP(), INTERVAL 90 day) )
      AND DATE(CURRENT_TIMESTAMP()) AND  o1.status = "Delivered" group by parent_order_id having count(parent_order_id > 1)
      )) as q2 on q1.parent_order_id = q2.parent_order_id) table1
    group by 
      parent_order_id, 
      product_id, 
      hub_id, 
      order_processing_date 
    order by 
      parent_order_id desc, 
      total_sum desc;