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Question

我有3张桌子

1. Payment_Schedule（Event_ID，Event_Type，Event_Incharge，Event_Date）
2. Product_AMC（AMC_ID，Customer_ID）
3. Item_Order（Order_ID，Customer_ID）

对于Payment_Schedule中的记录，Event_ID是AMC_ID或Order_ID。如果Event_ID是AMC_ID，那么Event_Type将是“AMC”，如果它是Order_ID，则Event_Type将是“Order”。

现在我的问题是我不知道如何获取Customer_ID以及Payment_Schedule的所有字段。

我正在使用MS Access 2003.请帮助。

Answer 1

显示所有客户及其所有payment_schedules

select PS.Event_ID, PS.Event_Type, PS.Event_Incharge, PS.Event_Date, PA.Customer_ID
from (Product_AMC PA
inner join Payment_Schedule PS on (PS.Event_Type='AMC' and PS.Event_ID=PA.AMC_ID))
union all
select PS.Event_ID, PS.Event_Type, PS.Event_Incharge, PS.Event_Date, IO.Customer_ID
from (Item_Order IO
inner join Payment_Schedule PS on (PS.Event_Type='Order' and PS.Event_ID=IO.Order_ID))
order by Customer_ID

对于单个客户，请说'ABC'

select PS.Event_ID, PS.Event_Type, PS.Event_Incharge, PS.Event_Date, PA.Customer_ID
from (Product_AMC PA
inner join Payment_Schedule PS on (PS.Event_Type='AMC' and PS.Event_ID=PA.AMC_ID))
where PA.Customer_ID = 'ABC'
union all
select PS.Event_ID, PS.Event_Type, PS.Event_Incharge, PS.Event_Date, IO.Customer_ID
from (Item_Order IO
inner join Payment_Schedule PS on (PS.Event_Type='Order' and PS.Event_ID=IO.Order_ID))
where IO.Customer_ID = 'ABC'