4. MySQL tutorial

Mysql

MySQL is the most popular relational database management system, and MySQL is one of the best RDBMS (Relational Database Management System: relational database management system) applications in WEB applications.

In this tutorial, you will quickly grasp the basic knowledge of MySQL and easily use the MySQL database.

4.1. What is a database?

Database (Database) is a warehouse that organizes, stores and manages data according to the data structure.

Each database has one or more different API for creating, accessing, managing, searching, and replicating saved data.

We can also store data in a file, but it is relatively slow to read and write data in the file.

So now we use a relational database management system (RDBMS) to store and manage large amounts of data. The so-called relational database is a database based on the relational model, which deals with the data in the database with the help of mathematical concepts and methods such as set algebra.

RDBMS is the characteristics of relational database management system (Relational Database Management System):

  • 1.数据以表格的形式出现

  • 2.每行为各种记录名称

  • 3.每列为记录名称所对应的数据域

  • 4.许多的行和列组成一张表单

  • 5.若干的表单组成database

4.2. RDBMS terminology

  • 4.2.1. MySQL tutorial

    MySQL is the most popular relational database management system, and MySQL is one of the best RDBMS...
    2025-10-25 12:31:22 UTC

  • 4.2.2. MySQL installation

    The MySQL download address for all platforms is: MySQL 下载 . Pick what you need. MySQL Community...
    2025-10-25 12:31:23 UTC

  • 4.2.3. MySQL management

    Start and shut down the MySQL server ¶ Under the Windows system ¶ ...
    2025-10-25 12:31:23 UTC

  • 4.2.4. MySQL PHP syntax

    MySQL can be used in many languages, including PERL, C, Cellular, JAVA and PHP. Among these languages, MySQL is the mo...
    2025-10-25 12:31:19 UTC

  • 4.2.5. MySQL connection

    Connect using mysql binary ¶ You can use MySQL binary to enter the mysql command promp...
    2025-10-25 12:31:19 UTC

  • 4.2.6. MySQL creates a database

    After logging into the MySQL service, we can use the create Command to create the database, ...
    2025-10-25 12:31:22 UTC

  • 4.2.7. MySQL deletes the database

    Using ordinary users to log in to the MySQL server, you may need specific permissions to create or delete MySQL databa...
    2025-10-25 12:31:23 UTC

  • 4.2.9. MySQL data type

    Defining the type of data field in MySQL is very important for optimizing your database. MySQL supports many ...
    2025-10-25 12:31:18 UTC

  • 4.2.10. MySQL creates a data table

    The following information is required to create an MySQL data table: Table name ...
    2025-10-25 12:31:22 UTC

  • 4.2.11. MySQL delete data table

    Deleting tables in MySQL is very easy to operate, but you have to be very careful when deleting tables, because all da...
    2025-10-25 12:31:19 UTC

  • 4.2.12. MySQL insert data

    Used in the MySQL table INSERT INTO SQL statement to insert data. You can insert data into the...
    2025-10-25 12:31:20 UTC

  • 4.2.13. MySQL query data

    The MySQL database uses SQL SELECT statements to query data. You can query the data in the database from the ...
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  • 4.2.14. MySQL WHERE clause

    We know that SQL SELECT statements are used to read data from the MySQL table. To conditionally select data f...
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  • 4.2.15. MySQL UPDATE update

    If we need to modify or update the data in MySQL, we can use the SQL UPDATE command to do so. Grammar ...
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  • 4.2.16. MySQL DELETE statement

    You can use SQL’s DELETE FROM command to delete records in the MySQL datasheet. You can do it in the ...
    2025-10-25 12:31:19 UTC

  • 4.2.17. MySQL LIKE clause

    We know that we use the SQL SELECT command in MySQL to read data, and we can read data in the SELECT ...
    2025-10-25 12:31:23 UTC

  • 4.2.18. MySQL UNION operator

    This tutorial introduces you to the syntax and examples of the MySQL UNION operator. Description ...
    2023-12-29 23:00:02 UTC

  • 4.2.19. MySQL sorting

    We know that SQL SELECT statements are used to read data from the MySQL table. If we need to sort the read da...
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  • 4.2.20. MySQL GROUP BY statement

    The GROUP BY statement groups the result set according to one or more columns. We can use COUNT, SUM, AVG, an...
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  • 4.2.21. Use of MySQL connections

    In the previous chapters, we have learned how to read data in one table, which is relatively simple, but in real appli...
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  • 4.2.22. MySQL NULL value processing

    We already know that MySQL uses the SQL SELECT command and the WHERE clause to read the data in the data table, but wh...
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  • 4.2.23. MySQL regular expression

    In the previous chapter, we have learned that MySQL can be accessed through the LIKE …% To make a fuzzy...
    2025-10-25 12:23:39 UTC

  • 4.2.24. MySQL transaction

    MySQL transactions are mainly used to deal with data with large amount of operations and high complexity. For example,...
    2025-10-25 12:31:21 UTC

  • 4.2.25. MySQL ALTER command

    When we need to change the data table name or modify the data table field, we need to use the MySQL ALTER command. ...
    2025-10-25 12:31:22 UTC

  • 4.2.26. MySQL index

    The establishment of MySQL index is very important for the efficient operation of MySQL, and the index can greatly imp...
    2025-10-25 12:31:23 UTC

  • 4.2.27. MySQL temporary table

    MySQL temporary tables are very useful when we need to save some temporary data. Temporary tables are visible only in ...
    2025-10-25 12:31:18 UTC

  • 4.2.28. MySQL copy table

    If we need to completely copy the MySQL data table, including the table structure, index, default value, etc. If you o...
    2025-10-25 12:31:20 UTC

  • 4.2.29. MySQL metadata

    You may want to know the following three messages about MySQL: 查询结果信息： The numbe...
    2025-10-25 12:31:21 UTC

  • 4.2.30. MySQL sequence usage

    MySQL sequence is a set of integers: 1, 2, 3,. Because a data table can only have one field self-increasing primary ke...
    2025-10-25 12:31:18 UTC

  • 4.2.31. MySQL handles duplicate data

    There may be duplicate records in some MySQL data tables, and in some cases we allow duplicate data, but sometimes we ...
    2025-10-25 12:31:21 UTC

  • 4.2.32. MySQL and SQL injection

    If you get the data entered by the user through a web page and insert it into a MySQL database, then the security prob...
    2025-10-25 12:31:21 UTC

  • 4.2.33. MySQL export data

    In MySQL, you can use SELECT…INTO OUTFILE Statement to simply export data to a text file. ...
    2025-10-25 12:31:22 UTC

  • 4.2.34. MySQL Import data

    In this section, we introduce several simple MySQL import data commands.
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  • 4.2.35. MySQL function

    MySQL has many built-in functions, and the descriptions of these functions are listed below. MySQL strin...
    2025-10-25 12:31:20 UTC

  • 4.2.36. MySQL IFNULL () function

    MySQL 函数 MySQL 函数 IFNULL() The function determines whether the first expressi...
    2025-10-25 12:31:22 UTC

  • 4.2.37. MySQL operator

    In this section, we focus on the operators of MySQL and their precedence. MySQL has the following main operators: ...
    2025-10-25 12:31:19 UTC
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