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  • hw5-3

    A database is a repository for storing data. It has a large storage space and can store millions, tens of millions, and hundreds of millions of pieces of data. However, the database does not store the data arbitrarily. There are certain rules, otherwise the efficiency of the query will be very low. The world today is a world of data filled with data, full of data. That is, the Internet world is the data world.There are many sources of data, such as travel records, consumption records, web pages viewed, messages sent, and so on. In addition to text type data, images, music, and sound are all data.

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