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  • CSS Counters Explained: Automatic Numbering Made Easy
    CSS Counters Explained: Automatic Numbering Made Easy
    CSSCounterssimplifyautomaticnumberinginwebdesign.1)Theyallowforeasygenerationofsequentialnumbersforelementslikelistsandheadings.2)Countersautomaticallyadjustwhenitemsareaddedorremoved,eliminatingmanualrenumbering.3)Theysupporthierarchicalnumberingfor
    CSS Tutorial . Web Front-end 660 2025-06-27 00:08:31
  • How to create a flip effect using CSS transforms?
    How to create a flip effect using CSS transforms?
    To create a CSS flip effect, the key is to use transform-style:preserve-3d and rotateY() or rotateX() functions in combination. 1. Build an HTML structure and simulate a card with a container containing the front and back sides; 2. Use CSS to locate the front and back sides and set backface-visibility:hidden to hide the content on the back; 3. Trigger the flip animation through:hover pseudo-class or JavaScript to achieve an interactive flip effect.
    CSS Tutorial . Web Front-end 937 2025-06-27 00:05:10
  • What is the difference between em, rem, px, and % units?
    What is the difference between em, rem, px, and % units?
    Whenchoosingunitsforwebdesign,therightchoicedependsonthecontextanddesiredbehavior.1.Usepxforfixed,precisemeasurementslikebordersorsmalliconsthatshouldn’tscale.2.Useemforrelativesizingthatscaleswiththeparent’sfontsize,idealforcomponentslikepaddingorwi
    CSS Tutorial . Web Front-end 765 2025-06-27 00:04:30
  • how to start mysql server on mac terminal
    how to start mysql server on mac terminal
    The method of starting MySQL server on the Mac terminal is as follows: 1. Start using mysql.serverstart or sudomysql.serverstart; 2. Check whether the process exists to confirm whether it is running; 3. If the startup fails, troubleshoot insufficient permissions, port occupation, configuration file errors or installation problems. If the command is not found or the startup fails, you can try to run the administrator privileges, check the 3306 port occupancy, check the log file location problems, and ensure that you use a formal method to install it to avoid path or dependency problems.
    Mysql Tutorial . Database 224 2025-06-27 00:03:21
  • Is it necessary to run mysql_secure_installation after I install MySQL
    Is it necessary to run mysql_secure_installation after I install MySQL
    Yes, it is highly recommended to run mysql_secure_installation after installing MySQL for improved security. This tool helps harden the default configuration and prevent unauthorized access by setting a strong root password, removing anonymous users, disabling remote root login, deleting test databases and reloading permissions. When using it, you need to select "yes" to confirm the above operation and enter a strong password. While the same effect can be achieved by manually executing SQL commands, the script is simpler and safer, especially suitable for production environments.
    Mysql Tutorial . Database 526 2025-06-26 14:04:10
  • mysql tutorial for data analysis
    mysql tutorial for data analysis
    To use MySQL for data analysis, systematic learning is required. First, design a data structure suitable for analysis: use wide tables and pre-aggregated fields to appropriately redundant data, such as merging orders and user information; modeling time dimensions separately, such as adding date_type fields or date dimension tables; using partition tables to improve efficiency, especially when processing log data, partitioning by date. Secondly, master the key SQL skills: use GROUPBY to cooperate with SUM/COUNT for statistics; use CASEWHEN classification, such as dividing user activity levels; use DATE_FORMAT/WEEK to slice by time; use window functions such as ROW_NUMBER/RANK to rank, such as checking the top three products in each city's sales. Finally optimize query performance: in user_i
    Mysql Tutorial . Database 399 2025-06-26 13:57:11
  • mysql tutorial about foreign keys and primary keys
    mysql tutorial about foreign keys and primary keys
    Primarykeysuniquelyidentifyrowsinatable,whileforeignkeysestablishrelationshipsbetweentables.Aprimarykeymusthaveunique,non-nullvaluesandeachtablecanhaveonlyone;itcanbeasinglecolumnoracompositeofmultiplecolumns.Foreignkeysreferencetheprimarykeyinanothe
    Mysql Tutorial . Database 746 2025-06-26 13:50:11
  • change mysql port on mac
    change mysql port on mac
    To modify the port of MySQL on Mac, first find the configuration file my.cnf, which is usually /etc/my.cnf or /usr/local/etc/my.cnf. You can also find it by the command mysql--help|grep'my.cnf'; secondly, add or modify the port parameters in the [mysqld] part of the configuration file, such as port=3307; then save the file and restart the MySQL service, which can be implemented through brewservicesrestartmysql; finally check whether the port is effective, use the command lsof-i:3307 or mysql-uroot-p-h127.0.0.1-P33
    Mysql Tutorial . Database 460 2025-06-26 13:09:10
  • mysql workbench error code 1045 access denied for user 'root'@'localhost'
    mysql workbench error code 1045 access denied for user 'root'@'localhost'
    ErrorCode:1045 encountered in MySQLWorkbench, which is usually caused by password error, permission configuration problems or user failure; solutions include: 1. Check whether the user name and password are correct, it is recommended to test login through the command line mysql-uroot-p; 2. If the password is wrong, you can skip permission verification and reset the password. The specific steps are to stop the service, start with skip-grant-tables, update the password and restart the service; 3. Check whether the 'root'@'localhost' exists, if not, you need to create and authorize it; 4. Troubleshoot other reasons such as whether the service is running, whether the configuration file is abnormal, and whether the authentication plug-in is suitable, such as modifying it to mysql_nati
    Mysql Tutorial . Database 737 2025-06-26 12:47:11
  • mysql tutorial on understanding data types
    mysql tutorial on understanding data types
    Choosing the right MySQL data type is critical to performance and storage efficiency. Integer types should be selected reasonably based on the value range and storage space. For example, tinyint is suitable for the status field, int is suitable for most scenarios, and bigint is used for super large values; avoid waste caused by using bigint all, and the unsigned attribute can be used to expand the positive range. String types should be selected as needed, char is suitable for fixed-length fields, varchar is suitable for variable-length content, and text series is used for large text; avoid abuse of varchar(255), and should be optimized according to actual length. Date and time types include date, time, datetime and timestamp, where timestamp accounts for
    Mysql Tutorial . Database 202 2025-06-26 12:33:12
  • how to upgrade mysql 5.7 to 8.0 on windows
    how to upgrade mysql 5.7 to 8.0 on windows
    The key points of upgrading MySQL5.7 to 8.0 on Windows include: 1. Back up the database and configuration files, use mysqldump to export all databases and copy the data folder; 2. Download and install the MySQL8.0 MSI package, select the upgrade option or manually replace the ZIP installation file; 3. Update the character set and authentication plug-in settings in the configuration file; 4. Run mysql_upgrade to check and repair the system table; 5. When encountering problems, check the log, force the old authentication method or re-register the service. The entire process needs to be handled with caution to ensure a smooth upgrade.
    Mysql Tutorial . Database 646 2025-06-26 11:18:11
  • mysql tutorial explaining JOINs with examples
    mysql tutorial explaining JOINs with examples
    JOINscombinedatafrommultipletablesbasedonrelatedcolumns.1.INNERJOINreturnsonlymatchingrows.2.LEFTJOINincludesallrowsfromthelefttable,fillingNULLswhenthere'snomatch.3.RIGHTJOINincludesallrowsfromtherighttable,andFULLJOIN(simulatedviaUNION)combinesallr
    Mysql Tutorial . Database 1001 2025-06-26 11:10:10
  • Why am I getting an 'access denied for user 'root'@'localhost'' error after a fresh MySQL install
    Why am I getting an 'access denied for user 'root'@'localhost'' error after a fresh MySQL install
    The problem "accessdeniedforuser'root'@'localhost'" is usually caused by not setting a password, authentication method changes or permission configuration errors. The solution is as follows: 1. If you do not set a password or forget your password, you can try logging in without a password and setting a new password, or resetting through security mode; 2. If you use the new version of MySQL/MariaDB, the default authentication method may be auth_socket, which needs to be modified to mysql_native_password; 3. Ensure that localhost is correctly connected and has access rights, use sudo to run the client or check the GUI tool configuration if necessary; 4. If you cannot log in completely, you can stop the MySQL server.
    Mysql Tutorial . Database 207 2025-06-26 10:58:11
  • How to find duplicate records in a MySQL table?
    How to find duplicate records in a MySQL table?
    Finding duplicate records in MySQL requires the use of GROUPBY and HAVING clauses. 1. First, clearly determine the duplicate key fields, such as single fields such as email or name, or combinations of multiple fields; 2. Use SELECT field COUNT() to combine GROUPBY and HAVINGCOUNT()>1 to filter duplicate values, such as SELECTemailFROMusersGROUPBYemailHAVINGCOUNT()>1; 3. If you need to display specific duplicate records, you can implement them through JOIN subquery, such as SELECTu.FROMuserssuJOIN(SELECTemailFROMuser(SELECTemailFROMuser)>1; 3. If you need to display specific duplicate records, you can use JOIN subquery to do so, such as SELECTu.FROMuserssuJOIN(SELECTemailFROMuser
    Mysql Tutorial . Database 946 2025-06-26 10:45:11

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