SQL Question - Select Data From Different Source

Table A




PRODUCTID PRICEDATE PRICE SOURCE
1 20080102 10.12 A
1 20080102 10.13 B
1 20080102 10.12 C
1 20080102 10.12 D
2 20080102 43.23 A
2 20080102 43.26 B
2 20080102 43.23 C
2 20080102 43.26 D






I have a table A with these fields PRODUCTID,PRICEDATE,PRICE,SOURCE

I need to find out which product id has differnt price from different souce

i.e suppose if for instance we take productid 1 , it has same price from 3 different source A,c,and D
and the price from source B is differ from .01

so in the result the need something like this'

RESULT


PRODUCTID PRICEDATE PRICE SOURCE PRICE DIFFERENCE DIFFERENCESOURCE
1 20080102 10.12 A,C,D .01 B
2 20080102 43.23 A,C .03 B,D

If the price is different from all the sources then we should show all the prices for that product...i.e all different prices









Can someone help

Thanks
Abhishek