并排显示两个表中的记录,仅匹配某些字段

Question

我有两张桌子,table A:

Customer_ID  Product  Date Of Sale  Pay Meth 1  Pay Meth 2  QTY
-----------  -------  ------------  ----------  ----------  ---
        123  AB       1/1/2012             111         222    1
        123  AB       1/1/2012             111         222    1
        456  AC       2/1/2012             333         444    1

并且table B:

Customer_ID  Product  Date Of Sale  Pay Meth 1  Pay Meth 2  QTY
-----------  -------  ------------  ----------  ----------  ---
        123  AB       1/1/2012             111         222    2
        456  AB       1/1/2012             124         111    1

我想,这样的客户记录匹配的数据了123在table A被归纳为:

Customer_ID  Product  Date Of Sale  Pay Meth 1  Pay Meth 2  QTY
-----------  -------  ------------  ----------  ----------  ---
        123  AB       1/1/2012             111         222    2

在它的右边出现以下记录table B:

Customer_ID  Product  Date Of Sale  Pay Meth 1  Pay Meth 2  QTY
-----------  -------  ------------  ----------  ----------  ---
        123  AB       1/1/2012             111         222    2

另外(总有一个)我们想要在该记录table A的右侧显示第三条记录table B(客户456)中的第二条记录,因为它们具有相同的Customer_ID,Product并且Date of Sale

所以看起来应该是这样的

Customer_ID  Product  Date Of Sale  Pay Meth 1  Pay Meth 2  QTY  Customer_ID  Product  Date Of Sale  Pay Meth 1  Pay Meth 2  QTY
-----------  -------  ------------  ----------  ----------  ---  -----------  -------  ------------  ----------  ----------  ---
        123  AB       1/1/2012             111         222    1          123  AB       1/1/2012             111         222    1
        456  AC       2/1/2012             333         444    1          456  AB       1/1/2012             124         111    1

Answer 1

您可以在每个表上执行子查询以获取每个客户的总和数量,然后通过客户ID加入结果,例如

SELECT a.*, b.*
FROM (
    Select customer_id, product, dateofsale, PayMeth1, PayMeth2, SUM(Qty) as Qty
    from TableA
    Group by customer_id, product, dateofsale, PayMeth1, PayMeth2
) a
JOIN (
    Select customer_id, product, dateofsale, PayMeth1, PayMeth2, SUM(Qty) as Qty
    from TableB
    Group by customer_id, product, dateofsale, PayMeth1, PayMeth2
) b 
ON a.customer_id = b.customer_id