https://blog.csdn.net/cnmlgbnbcs/article/details/110643393?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522164327697216780255279283%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%25
with database. without specific data.
with entity-relation diagram
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