Change student_attendance table

@@ -15,8 +15,8 @@ FOREIGN KEY (student_id) REFERENCES student(student_id)
 CREATE TABLE student_attendance(
 lecture_id VARCHAR(20) NOT NULL,
 student_id VARCHAR(10) NOT NULL,
-attendance_time DATETIME NOT NULL, 
 status VARCHAR(10) NOT NULL,
+attendance_time DATETIME DEFAULT CURRENT_TIMESTAMP, 
 FOREIGN KEY (lecture_id) REFERENCES lecture(lecture_id),
 FOREIGN KEY (student_id) REFERENCES student(student_id)
 );