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Technical Articles

Database

Mysql Tutorial

mysql tutorial on INSERT, UPDATE, and DELETE

MySQL adds, deletes, and modify operations need to pay special attention to accuracy and security. When inserting data, use the INSERTINTO table name (column) VALUES (value) syntax. The auto-increment primary key does not need to be filled in manually, and multiple records can be inserted at a time to improve efficiency. When modifying data, be sure to add WHERE conditions in the UPDATE statement to avoid updating the entire table. It is recommended to query and confirm the target record before modifying; when deleting data, DELETE must have WHERE conditions, otherwise the entire table will be cleared. If you need to reset the auto-increment ID, you can use TRUNCATETABLE, but this operation cannot be rolled back and there are no WHERE conditions, so you must use it with caution.

Jun 30, 2025 am 01:53 AM

how to check mysql version on mac

Open the terminal and enter the command mysql--version or mysqld--version to view the installed MySQL version; 2. If you are logged in to MySQL, you can execute SELECTVERSION() on the console to obtain the running version information; 3. If you use Homebrew to install, you can run brewinfomysql to view the default version description. These three methods are applicable to different scenarios: command line quick check, database internal confirmation and Homebrew installation information query, and can all effectively obtain the MySQL version number.

Jun 30, 2025 am 01:49 AM

How to connect to a remote database using mysql workbench

To use MySQLWorkbench to connect to a remote database, 1. Ensure that the remote database allows external connections, including configuring binding IP, opening firewall ports, and setting user permissions; 2. Create a new connection in Workbench, fill in the host name, port, user name and password, and test the connection; 3. If you cannot connect directly, you can establish a secure connection through SSH tunnel; 4. Pay attention to troubleshooting common problems such as connection timeout, access denial, and slow connection. After correct configuration, connecting to the remote database is not complicated, but attention should be paid to details.

Jun 30, 2025 am 01:44 AM

how to reset mysql root password windows

To reset MySQL's root password, you must start MySQL by skipping permission verification and then modify the password. 1. Stop running MySQL service, and can be stopped by netstopmysql or through the service management interface; 2. Execute mysqld-skip-grant-tables in the bin folder of the installation directory to start MySQL; 3. Execute mysql-uroot login in the new command prompt window and use ALTERUSER or SETPASSWORD to modify the password; 4. Press Ctrl C to stop the current service and restart the MySQL service normally through netstartmysql.

Jun 30, 2025 am 01:43 AM

mysql reset Password

How to view and kill processes in mysql workbench

ToviewandkillMySQLprocessesinMySQLWorkbench,openthe"Server"menu,select"ProcessList"toseerunningprocesseswithdetailslikeProcessID,User,Host,DB,Command,Time,State,andInfo.1.Identifyproblematicprocessessuchaslong-runningqueriesorstuc

Jun 30, 2025 am 01:43 AM

mysql tutorial on creating a user and granting privileges

The method of creating MySQL users and assigning permissions is as follows: 1. Create a user using the CREATEUSER statement, in the format CREATEUSER'username'@'host'IDENTIFIEDBY'password', for example, CREATEUSER'dev_user'@'%'IDENTIFIEDBY'securePass123'; 2. Use the GRANT command to assign permissions, such as GRANTALLPRIVILEGESONpro, such as GRANTALLPRIVILEGESONpro

Jun 30, 2025 am 01:42 AM

mysql workbench lost connection to mysql server during query

When an error "LostconnectiontoMySQLserverduringquery" appears, the server timeout setting, packet size limit, network status and client connection parameters should be checked and adjusted first. The specific steps are as follows: 1. Check and increase the wait_timeout and interactive_timeout parameters to extend the idle connection holding time; 2. Increase the max_allowed_packet value to support larger data transmission; 3. Use ping or traceroute to check network delays and packet loss, and confirm that the firewall or security group has not interrupted the connection; 4. Turn up the connection and execute super in MySQLWorkbench

Jun 30, 2025 am 01:41 AM

A complete mysql tutorial from scratch

ThebestwaytolearnMySQLisbydoing,throughsettingupadatabase,creatingtables,insertingandretrievingdata,andunderstandingbasicqueries.1.StartbyinstallingMySQLCommunityServerorusingXAMPP,andconnectviacommandlineorGUItoolslikeMySQLWorkbench.2.Createadatabas

Jun 30, 2025 am 01:40 AM

add mysql to windows path

After installing MySQL, you need to add its bin directory to the Windows Path environment variable to use the mysql command on the command line. The specific steps are as follows: 1. Find the bin directory of MySQL, such as C:\ProgramFiles\MySQL\MySQLServerX.X\bin or the path for manual installation; 2. Right-click "This computer" to enter "Properties", select "Advanced System Settings", click "Environment Variables", find the Path in "System Variables" and edit it, and add the new bin directory path; 3. It is recommended to check the user variables and system variables at the same time and add them according to your needs; 4. Open a new command prompt window and enter mysql--version to verify whether it is successful, if it is displayed

Jun 30, 2025 am 01:38 AM

How to install MySQL using apt-get

The steps to install MySQL using apt-get include: 1. Update the software package list to ensure that the latest version is obtained; 2. Install the MySQL service and check its running status; 3. Run the security initialization script to set the root password, delete anonymous users, prohibit remote login, etc.; 4. Log in to MySQL and execute commands to verify that the installation is successful. During the entire process, you need to pay attention to key points such as updating the apt list, configuring security settings, and setting strong passwords, otherwise it may cause installation failure or security risks. Follow the above steps to successfully complete the installation and basic configuration of MySQL.

Jun 30, 2025 am 01:37 AM

mysql workbench data export and restore

MySQLWorkbench can export database structures and data and recover them. Use DataExport to export the entire database or part of the table, and only export structures without data are supported. Use DataImport/Restore to import SQL files, suitable for small and medium-sized data. Notes include consistent character sets, table engine compatibility, whether the target database exists, user permissions, and whether data insertion is included.

Jun 30, 2025 am 01:36 AM

how to install mysql on windows wsl

ToinstallMySQLonWindowsusingWSL,firstupdateyoursystemwithsudoaptupdateandsudoaptupgrade.2)EnableWSLandinstallaLinuxdistrolikeUbuntufromtheMicrosoftStoreifnotalreadydone.3)InstallMySQLviasudoaptinstallmysql-server.4)Checkitsstatuswithsudosystemctlstat

Jun 30, 2025 am 01:35 AM

What are the major new features in MySQL 8.0 compared to 5.7?

MySQL 8.0 has made significant improvements in several key areas compared to 5.7. 1. The default authentication method is changed to caching_sha2_password, which enhances security but may also cause compatibility issues. 2. The configuration needs to be adjusted or the connection library is upgraded; 2. The window functions and CTE are introduced to improve the readability and ability of complex queries; 3. The JSON support is improved, and new functions such as JSON_TABLE() and optimizes indexing and aggregation operations are added; 4. The atomic DDL statement is implemented to ensure that the operation is successful or all failed to avoid data inconsistency; 5. The performance mode and query optimization enhancement include more detailed monitoring, optimization of statistics and sorting performance; 6. The InnoDB engine is enhanced, such as the introduction of cluster support, replication sets, tablespace addition

Jun 30, 2025 am 01:33 AM

mysql workbench could not acquire management access for connection

When encountering the "cannotacquiremanagementaccessforconnection" error, it is usually caused by insufficient permissions or configuration restrictions. You need to troubleshoot the following steps: 1. Check whether the user permissions include global permissions such as RELOAD, PROCESS, SUPER, etc., and the administrator will grant the required permissions if necessary; 2. Check whether the my.cnf/my.ini configuration file has skip-grant-tables or bind-address restrictions, and comment or adjust appropriately; 3. Confirm whether the current account is a read-only account, and it should be replaced with an account with administrative permissions; 4. Try to use the root user to connect to eliminate permission problems, if you forget

Jun 30, 2025 am 01:30 AM