MySQL Programming homework by Ko Minjeong 20180504
From Biolecture.org
1) make database named hw0507 and try to use this database.
2) make table in database named hw0507. make 5 coloumns; id, subject, grade, start, end.
then put rows in the table and check.
3) put same rows then make 1 row be taken out from table and check.
