Question

有人可以解释为什么这不起作用：

select
   supplierorder,
   company,
   forename,
   surname,
   telephone,
   order_date,
   lbs_items.name,
   price,
   quantity,
   sum (quantity * price) as "Order Total Price:"
from
   lbs_supplier_orders
   join lbs_suppliers using (supplier)
   join lbs_persons using (person)
   join lbs_addresses using (address)
   join lbs_supplier_orderlines using (supplierorder)
   join lbs_items using (item)
group by
   supplierorder

Answer 1

在聚合查询中，所有列都需要位于group by子句或聚合函数中（例如sum()或avg()。我认为您打算使用以下内容：

select supplierorder, company, forename, surname, telephone, order_date,
       sum(quantity * price) as "Order Total Price:"
from
   lbs_supplier_orders
   join lbs_suppliers using (supplier)
   join lbs_persons using (person)
   join lbs_addresses using (address)
   join lbs_supplier_orderlines using (supplierorder)
   join lbs_items using (item)
group by supplierorder, company, forename, surname, telephone, order_date;

请注意我删除了一些列。如果包含所有可能的列，那么我想知道为什么需要聚合查询。

为什么我的多重SQL不起作用，而不是表达式

1 个答案: