Crosstabulation Solution

[StacyCui]

Hi, Recently, I have a topic on cross selling.  I have a order table. 

Product	OR	Client ID
A	100	1
A	200	2
A	500	5
A	10	4
B	7	1
B	8	3
C	90	2
C	40	4

what I'm trying to achieve is:

Store	A	B	C
A	-	1	2
B	1	-	1
C	2	0	-

It can be show how many clients choose the product combination. How to create a data model?