import the table from the old db into the current db
then run and update query
Code:
UPDATE [one big table] SET mycolumn = othertablename.mycolumn
WHERE othertablename.acolumn = [one big table].acolumn
providing there is a unique reference that is the same in both tables that should work. that unique reference should replace acolumn.
the way this works is that you tell the SQL engine to replace the value of mycolumn with t he value form the othertable where there is a match between the a column values. if you need more than one column to identify a row uniquely then
Code:
WHERE othertablename.acolumn = [one big table].acolumn
AND othertablename.bcolumn = [one big table].bcolumn
AND othertablename.ccolumn = [one big table].ccolumn
repalce the mycolumn, othertablename, a column etc with your own table /column names