连接表和聚合/子查询

Question

I have 2 tables as show below.

Table1

Order ID	Item_code	Sales_Price	Qty_ordered	Total	Qty shipped
1000	111	10	5	$50	1
1000	222	20	10	$200	2
1000	333	30	15	$450	0

I have another table that stores only the details of how much was invoiced (ie how much we shipped)

Table2 (because we shipped only 10x1 and 20x2 = $50)

Order ID	Invoice_total
1000	$50

I wrote the following query,

select T1.Order_ID, 
       sum(T1.Qty_Ordered) as Qty_Ordered, 
       sum(T1.Total) as Total_Amt_ordered, 
       sum(T1.Qty_shipped) as Qty_Shipped, 
       sum(T2.Invoice_total) 
  from T1 join 
       T2 on T1.Order_ID = T2.Order_ID

This query gives me the following output, (It is adding $50 to all the rows of T1 Orders).

Order ID	Qty_ordered	Total	Qty shipped	Invoice_total
1000	30	$700	3	$150

Whereas now, I want my output to be as:

Order ID	Qty_ordered	Total	Qty shipped	Invoice_total
1000	30	$700	3	$50

(because we shipped only $50)

What changes should I make to my query? I know I can just hard code it but my database has 1000's of orders and 1000's of Half shipped Orders. I want to keep track of Shipped $ (Invoiced $) for all the orders.

Answer 1

If I understand correctly, you want:

select T2.Order_ID, T2.Invoice_total, 
       sum(T1.Qty_Ordered) as Qty_Ordered, 
       sum(T1.Total) as Total_Amt_ordered, 
       sum(T1.Qty_shipped) as Qty_Shipped, 
from T2 join 
     T1
     on T1.Order_ID = T2.Order_ID
group by T2.Order_ID, T2.Invoice_total;

That is, you don't want to aggregate Invoice_total . You just want it to be a group by key.