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Mysql database interview questions & knowledge points summary (2021 latest version) | javaguide
2022-01-27 00:16:53 【JavaGuide】
seeing the name of a thing one thinks of its function , Relational database is a kind of database based on relational model . The relational model shows the relationship between the data stored in the database （ one-on-one 、 One to many 、 Many to many ）.
In relational database , Our data is stored in various tables （ For example, user table ）, Each row in the table holds one piece of data （ Like a user's information ）.
Most relational databases use SQL To manipulate the data in the database . also , Most relational databases support the four features of transactions (ACID).
What are the common relational databases ？
MySQL、PostgreSQL、Oracle、SQL Server、SQLite（ Wechat is used to store local chat records SQLite） ….
MySQL It's a relational database , It is mainly used for persistent storage of some data in our system, such as user information .
because MySQL Open source, free and relatively mature database , therefore ,MySQL It is widely used in various systems . Anyone can be in GPL(General Public License) Download and modify it according to the needs of personalization .MySQL The default port number for is 3306.
author[JavaGuide],Please bring the original link to reprint, thank you.
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