join between two tables

Hi Pls tell me
There are two tables A and B where asset tags are present, but in one table in rows and in another in column wise.

for eg
ASSet Tag
SR-062009-00032966
SR-062009-00032962
SR-072009-00020572
SR-072009-00020571
SR-072009-00020585
HH-092009-00038342




Table B
feild 1 -->Asset TAG
Record 1-->SR-072009-00020572,SR-072009-00020571,SR-062009-00020685,SR-072009-00001592,SR-072009-00001376,SR-062009-00020683,SR-092009-00001617


filed 2 --> Material code
REcord 1-->121
REcord 2-->123


pls tell me the query so that asset tag of A matches with each and every asset tag table of B and output comes as




Output
Asset TAg -------- MAterial Code
SR-062009-00032966
SR-062009-00032962
SR-072009-00020572 ------121
SR-072009-00020571 -------121
SR-072009-00020585