1. at_mid, at_final, at_attend, at_homework 값 업데이트 (40/40/10/10) update attend set at_homework = 8 where at_num=1; update attend set at_homework = 5 where at_num=2; update attend set at_homework = 2 where at_num=3; update attend set at_homework = 10 where at_num=4; update attend set at_homework = 7 where at_num=5; update attend set at_homework = 5 where at_num=6; update attend set at_homework = ..