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  • homework 5-3

    Database is a collection of data that can be stored together in a certain way, shared with multiple users, has the smallest redundancy, and is independent of the application program. It can be regarded as an electronic file cabinet where electronic files are stored. Users can add, query, update, delete and other operations on the data in the files.

    A database is a warehouse for storing data. It has a large storage space, which can store millions, tens of millions, hundreds of millions of data


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