Upsert data in one Table based on data in another Table?

Hi,

Is it possible to UPSERT data in one table based on data in a different table?

Here is the scenario:

CREATETABLE T (COL INT, VAL INT);

INSERTINTO T VALUES (1, 1);

INSERTINTO T VALUES (2, 2);

CREATETABLE u (COL INT, VAL INT);

INSERTINTO u VALUES (1, 4);

INSERTINTO u VALUES (3, 3);

UPSERT something like this:

UPSERT T

VALUES (U.COL, U.VAL)

FROM   T, U

WHERE  T.COL=U.COL;

What I finally want to see in the Table T is

1,4

2,2

3,3

Thanks,

Varun Vemala