title: can we use update with load query?
body: <p>I've loaded a csv file(which contains columns studentsID and marks) into a table.
  Now am loading another csv file into same table(with same columns but with the updated marks of same students).
  Now it should check for the condition if there is increase in students marks for particular student then the new marks should be updated  else no change in marks.
  Can we use update with load query?If possible how can we do that</p>