* 2012-10-29 v1.0.1

s즳 table 
score_subject ذOƪ   subject_id
score_ss      CǦ~ҵ{]w ss_id , subject_id , year ,semester, class_year
score_course  ҪO year,semester,class_id(101_1_07_01),teacher_sn

sW table
stud_eduh_teacher wǬتѮv, Ѩ޲zvѮv]w, p: Ʋժ
stud_eduh_teacher2 wSwѮvtdJYǯZŻɸ, Ѩ޲zvѮv]w, p: Ʋժ