delete
fix
Merge branch 'bowen' into shuaiwang
Merge branch 'Bohan-Zheng' into shuaiwang
Merge branch 'master' into shuaiwang
Merge branch 'bowen' into shuaiwang
Merge branch 'Bohan-Zheng' into rtong
Merge branch 'Bohan-Zheng' into rtong
add find corerequsite
Merge branch 'Bohan-Zheng' into shuaiwang
Merge branch 'Bohan-Zheng' into shuaiwang
version1.5
wawawawawawa
Merge branch 'bowen' into rtong
cascading deletion
Merge branch 'rtong' into Bohan-Zheng
done with semesterData
Merge branch 'rtong' into Bohan-Zheng
version2.0
add core requisite