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Non-repeating fields in the table can be used as primary keys. For example, in the student table, the student number field can be used as the primary key, because the student number will definitely not be repeated, but the name is not appropriate, because the name may be repeated.

Shooting is to record images of people and things with cameras and video recorders. Different scenes have different shooting techniques, including night scene shooting, rain scene shooting, building shooting, portrait shooting and so on. Film dynamic art shooting is also a kind of shooting, but it must follow certain principles. With the progress of science and technology, shooting has become more and more simple and popular.