Change DB dummy data

@@ -8,12 +8,6 @@ VALUES('2014104161', '허진호');
 INSERT INTO student(student_id, student_name)
 VALUES('2014104117', '양원영');
 INSERT INTO student(student_id, student_name)
-VALUES('2019310943', '김소언');
-INSERT INTO student(student_id, student_name)
-VALUES('2019310152', '이준범');
-INSERT INTO student(student_id, student_name)
-VALUES('2018315456', '이석영');
-INSERT INTO student(student_id, student_name)
 VALUES('2016100789', '이준오');
 
 INSERT INTO lecture_students(lecture_id, student_id)
@@ -23,8 +17,4 @@ VALUES('0', '2014104161');
 INSERT INTO lecture_students(lecture_id, student_id)
 VALUES('0', '2014104117');
 INSERT INTO lecture_students(lecture_id, student_id)
-VALUES('0', '2019310943');
-INSERT INTO lecture_students(lecture_id, student_id)
-VALUES('0', '2019310152');
-INSERT INTO lecture_students(lecture_id, student_id)
-VALUES('0', '2018315456');
\ No newline at end of file
+VALUES('0', '2016100789');
\ No newline at end of file