I can only assume with the information given that pol is another table that you have the updated values stored in.
If that is not the case, please ignore the rest of my comments.
If it is:
You will need to modify the Update Statemnent to include a Join between Table1 and the Table pol. Something like the following should be on the right track:
Code:
UPDATE Table1[COLOR=blue][B] INNER JOIN Pol[/B][/COLOR]
ON [COLOR=red][B]Table1.Table1JoinKey = Pol.PolJoinKey[/B][/COLOR]
SET Column1 = Pol.Column1;
BLUE Code needs to be added. RED Code needs to be added, but has not been defined.