If the student logs in with the email address, he may get "Wrong Password" after logging out. If the student logs in with the new student number, he won't get the message after logging out. If the student logs in with the old student number, he won't get the message after logging out. The relevant database table; users_table Student_ID, Email, Password 2016123, 1701699340@qq.com, password1 2022123, 1701699340@qq.com, password2