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Technical Articles

Database

Mysql Tutorial

mysql tutorial pdf for offline learning

TolearnMySQLeffectivelyofflineusingaPDFtutorial,chooseawell-structuredresourcewithclearexplanations,codeexamples,logicalprogression,andpracticeexercises.1)Lookforclarityinexplainingqueries,joins,indexes,etc.2)Ensurereal-worldexamplesareincluded.3)Che

Jun 30, 2025 am 01:27 AM

pdf MySQL Tutorial

mysql workbench ssh tunnel authentication error

When encountering the SSHTunnelAuthenticationError of MySQLWorkbench, first check whether the SSH login credentials are correct, including the user name, password, or private key path and permissions; secondly, confirm whether the server allows the specified user's login method, such as PasswordAuthentication settings and user permissions; then ensure that the SSH settings in MySQLWorkbench are accurate, including SSHHostname, Username and authentication methods; finally troubleshoot the key file permissions, it is recommended to set the private key permission to 600 and the .ssh directory permission to set it to 700. Manually testing SSH connections via the command line can help locate problems

Jun 30, 2025 am 01:23 AM

mysql windows service not starting

The common reasons and solutions for MySQL failing to start as a service on Windows are as follows: 1. Check the error log to obtain specific problem clues, such as port conflicts, insufficient permissions or data directory errors; 2. Troubleshoot the occupancy of 3306 ports, which can be solved by terminating the process or modifying the port number in the configuration file; 3. Ensure that the data directory path is correct and MySQL has sufficient permissions to access, and re-initialize the data directory if necessary; 4. Manually run the mysqld command to view detailed error information, which is convenient for locating problems such as missing DLLs, configuration syntax errors. Most startup failures can usually be resolved through the above steps.

Jun 30, 2025 am 01:19 AM

mysql tutorial on how to connect with Python

Want to connect to MySQL in Python? The answer is to use mysql-connector-python or pymysql library to achieve it. The specific steps are as follows: 1. Install the connection library, install mysql-connector-python or pymysql through pip; 2. Write code to connect to the database, import the corresponding module and pass in host, user, password, database and other parameters; 3. Create a cursor object to execute SQL statements, such as query, insertion, update, etc.; 4. Handle common problems, if the connection fails, you need to check the host address, remote access permissions and firewall settings, and report the error "Accessdenied" and confirm the user name and password

Jun 30, 2025 am 01:14 AM

mysql python

mysql tutorial explaining GROUP BY and aggregate functions

GROUPBYandaggregatefunctionsareessentialforsummarizingdatainMySQL.AggregatefunctionslikeCOUNT(),SUM(),AVG(),MAX(),andMIN()computesinglevaluesfromsetsofrows,oftenusedwithGROUPBYtogroupdatabysharedvalues.WhenusingGROUPBY,includeallnon-aggregatedcolumns

Jun 30, 2025 am 01:06 AM

Create EER diagram from existing database mysql workbench

Use MySQLWorkbench to quickly generate EER charts from existing databases. The specific steps are: 1. Create a new model in Model Explorer; 2. Select "Create EER model from existing database" and configure database connections; 3. Enter the reverse engineering process and select the tables and other objects to be imported; 4. After the generation is executed, view the EER chart and manually adjust the missing association relationship; 5. Export the chart to PNG or PDF format for sharing. The entire process relies on foreign key constraints to ensure the accuracy of the relationship. If there is no foreign key, it needs to be supplemented manually.

Jun 30, 2025 am 12:47 AM

database Honor 圖

allow remote connection to mysql server on windows

To allow remote access to MySQL server, you need to modify the configuration file, open the firewall port, and set user permissions. First, edit the my.ini or my.cnf file, comment out bind-address=127.0.0.1 to listen to all IPs; second, create a new inbound rule in the Windows firewall to open port 3306; finally, use the GRANT statement to grant the user permission to connect remotely from % or a specific IP, and perform FLUSHPRIVILEGES refresh permissions. After the configuration is completed, you can troubleshoot connection problems through tools such as netstat, ping and telnet.

Jun 29, 2025 am 02:07 AM

change mysql port 3306 on windows

To modify the MySQL default port, you need to edit the configuration file and restart the service. The specific steps are: 1. Find the my.ini or my.cnf file, usually located in the installation directory; 2. Add or modify the port parameters in the [mysqld] paragraph, such as port=3307; 3. After saving the file, check whether the new port is occupied; 4. Restart the MySQL service through the service manager; 5. If the startup fails, check the error log to troubleshoot; 6. Modify the firewall rules to allow the new port to enter; 7. Specify the new port number when the client connects. Pay attention to avoid port conflicts and service restart issues throughout the process.

Jun 29, 2025 am 02:05 AM

What is the principle behind MySQL Master-Slave replication?

MySQLMaster-Slavereplicationworksbyrecordingdatachangesinthemaster'sbinarylogandreplayingthemontheslave.1.Themasterlogsalldatamodifications(excludingSELECTqueries)intothebinarylog,whichmustbeenabledvialog-bin=mysql-binandassignedauniqueserver_id.2.Th

Jun 29, 2025 am 01:59 AM

How to completely uninstall and reinstall MySQL on Mac

To completely uninstall and reinstall MySQL, please follow the following steps: 1. Stop MySQL service, set up the MySQL service through the system or use the terminal command sudomysql.serverstop; 2. Use the terminal to delete MySQL-related files and directories, including binary files, support files and configuration files; 3. Download the MySQL version suitable for Mac from the official website and install it, record the temporary root password; 4. Change the root password immediately after logging in, and verify the installation to confirm that the database is running normally.

Jun 29, 2025 am 01:58 AM

How to set or reset the root password after you install MySQL

To set or reset MySQL's root password, you can follow the following steps: 1. When you forget your password, start MySQL in safe mode and execute the password update command by creating an init file; 2. When setting your password for the first time, run the mysql_secure_installation tool to gradually configure it; 3. For the MySQL8 version, if you need to be compatible with the old client, you should modify the root user authentication method to mysql_native_password. These methods are suitable for different scenarios and ensure security and compatibility.

Jun 29, 2025 am 01:57 AM

How to backup a database in mysql workbench

There are two common ways to use MySQLWorkbench to back up databases: one is to export SQL files through DataExport, which is suitable for most users; the other is to use BackupProjects, which is suitable for unified management of multiple backups. The specific operations are as follows: 1. Use DataExport: After connecting to the database, select "Server" → "DataExport", select the target database or table, set the export path and check "IncludeCreateSchema" and "IncludeDropStatements", click "StartExport"; 2. Use BackupProjects: click "Create"

Jun 29, 2025 am 01:57 AM

Why is the mysql command not found after a successful install

Check whether MySQL is installed correctly and use which or brewinfo to confirm; 2. Make sure that the mysql command is in PATH, manually add the path and save it permanently; 3. Install the correct package containing the client, such as default-mysql-client; 4. Start the MySQL service and complete the initial settings. The problem usually comes from the path configuration, missing installation package or not starting the service. One by one, you can solve the "mysqlcommandnotfound" error.

Jun 29, 2025 am 01:56 AM

How to install MySQL Community Server

The steps to install MySQLCommunityServer include downloading, installing, and configuring. First, go to the official website to download the corresponding system installation package. Windows recommends using MSI installation package. Linux can be used for distribution repository or RPM/DEB package. macOS is installed with dmg or Homebrew. Secondly, when installing Windows, select "DeveloperDefault", set the root password, enable system services and power-on self-start. Then, Linux users use apt to install and run mysql_secure_installation to configure security options, and macOS users install and start the service through Homebrew. Finally, enter via the command line

Jun 29, 2025 am 01:55 AM