SQL Cookbook
Written in O'Reilly's popular Problem/Solution/Discussion style, the SQL Cookbook is sure to please. Anthony's credo is: "When it comes down to it, we all go to work, we all have bills to pay, and we all want to go home at a reasonable time and enjoy what's still available of our days." The SQL Cookbook moves quickly from problem to solution, saving you time each step of the way.
Not working in MySQL...
Alternative for MS Access:
UPDATE tbldest INNER JOIN tblsrc ON tbldest.pk1 = tblsrc.pk1 AND tbldest.pk2 = tblsrc.pk2 SET tbldest.col3 = tblsrc.col3, tbldest.col4 = tblsrc.col4;