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Technical Articles

Database

phpMyAdmin server status overview

ThephpMyAdminServerStatusOverviewprovidesreal-timeinsightsintoMySQL/MariaDBperformance,withkeysections:1.LoadMonitoringshowingCPU,memoryusage,anduptime;2.Connectionsdisplayingmaxconcurrent,total,andabortedconnections;3.NetworkTrafficindicatingbytesse

Aug 12, 2025 am 03:00 AM

How to convert rows to columns dynamically in SQL

The core method of dynamically converting rows to columns is to use dynamic PIVOT. 1. First, get the unique values to be converted into columns (such as Category); 2. Use STRING_AGG or FORXMLPATH to construct these values into column names strings with square brackets; 3. Splice dynamic SQL statements containing PIVOT logic, where the PIVOT part uses an aggregate function (such as SUM) to rotate the value columns (such as Amount) by column name collection; 4. Execute the generated SQL through sp_executesql. In SQLServer, please pay attention to using QUOTENAME to process special characters. Old versions need to use STUFF and FORXML instead of STRING_AGG, and other databases

Aug 12, 2025 am 02:59 AM

sql 動(dòng)態(tài)列轉(zhuǎn)換

How to import database in phpMyAdmin

To import a database, first log in to phpMyAdmin, select or create a database, click the "Import" tab, select the SQL file and click "Go" to complete the import; 1. Log in to phpMyAdmin (such as http://localhost/phpmyadmin); 2. Optional: Click "Database", enter the name and select the collation (such as utf8mb4_unicode_ci), and create a new database; 3. Select the target database on the left; 4. Click the "Import" tab at the top; 5. Click "Select File" to upload the .sql or .sql.gz file; 6. Confirm the format is SQL, keep the default settings, and click "Go" to start importing; for large files, you can compress

Aug 12, 2025 am 02:50 AM

How to get the week number from a date in SQL?

To get the number of weeks from dates, you need to select the corresponding function according to the database system: 1.MySQL uses EXTRACT(WEEKFROMdate) (MySQL8.0 supports ISO weeks); 2.PostgreSQL uses EXTRACT(WEEKFROMdate) to directly return ISO weeks; 3.SQLServer uses DATEPART(ISO_WEEK,date) to obtain ISO weeks; 4.SQLite uses strftime('%W',date) as the base number of weeks, and needs to be manually adjusted to achieve ISO weeks; 5. Oracle uses TO_CHAR(date,'IW') to obtain ISO weeks; it is recommended to use IS first

Aug 12, 2025 am 02:38 AM

phpMyAdmin migrating a database

To use phpMyAdmin to migrate the database, first export the original database and import it to the target server, and finally update the application configuration. 1. Select the "Custom" mode when exporting, check the options "Add DROP", "Add CREATEDATABASE", "Including backticks" and other options to ensure that the complete SQL script is generated; 2. After the target server creates a database of the same name, upload the SQL file through the "Import" function. If the file is too large, adjust the PHP upload restrictions or use the compressed format; 3. Update the database name, user name, password and host information in the application configuration file, and modify the absolute path such as WordPress siteurl and home; 4. Check the table data integrity, user permissions and test the application connection

Aug 12, 2025 am 02:15 AM

php java

How to analyze the slow query log in MySQL

First, make sure to enable and correctly configure the slow query log, set slow_query_log=ON, long_query_time=1.0, and log_queries_not_using_indexes=ON, and restart MySQL or dynamic application configuration; 2. Use mysqldumpslow tool to analyze the log, view the most frequent slow query through mysqldumpslow-sc-t10, or filter specific tables with the -g parameter; 3. Use pt-query-digest in PerconaToolkit for in-depth analysis, generate detailed statistics and optimization suggestions, such as identifying that Rows_examined is much larger than Ro

Aug 12, 2025 am 02:13 AM

How to replace a specific part of a string in SQL?

To replace a specific part of a string, you can use the REPLACE() function, whose syntax is REPLACE(string,old_substring,new_substring), which replaces all matching substrings in the string with new substrings; 1. Can be used to update column values, such as UPDATEproductsSETdescription=REPLACE(description,'old-brand','new-brand')WHEREdescriptionLIKE'%old-brand%'; 2. Can clean up data during query, such as SELECTREPLACE(phone,

Aug 12, 2025 am 02:01 AM

How to add a column to a table in MySQL

To add columns to an existing MySQL table, you need to use the ALTERTABLE statement to match the ADDCOLUMN clause; the basic syntax is ALTERTABLEtable_nameADDCOLUMNcolumn_namedata_type[constraints], where the COLUMN keyword can be omitted; for example, add VARCHAR column: ALTERTABLEusersADDCOLUMNemailVARCHAR(100); add columns with NOTNULL constraints: ALTERTABLEusersADDCOLUMN created_atDATETIMENOTNULL; add a lever to a VARCHAR column; add a lever to a VARCHAR column: ALTERTABLEusersADDCOLUMN created_atDATETIMENOTNULL; add a lever to a VARCHAR column: ALTERTABLEusersADDCOLUMNcreated_atDATETIMENOTNULL; add a lever to a VARCHAR column: ALTERTABLEusersADDCOLUMNcreated_atDATETIMENOTNULL; add a lever to a VARCHAR column: ALTERTABLEusersADDCOLUMNcreated_atDATETIMENOTNULL; add a lever to a VARCHAR column: ALTERTABLEusersADDCOLUMNcreated_atDATETIMENOTNULL; add a lever to a VARCHAR column: ALTERTABLEusersADDCOLUMNcreated_atDATETIMENOTNULL;

Aug 12, 2025 am 01:56 AM

How to perform a case-insensitive search in SQL

Thesafestandmostportablewaytoperformacase-insensitivesearchinSQListousetheLOWER()orUPPER()functiononboththecolumnandthesearchterm,suchasSELECT*FROMusersWHERELOWER(name)=LOWER('John'),whichensuresconsistentbehavioracrossalldatabasesincludingPostgreSQL

Aug 12, 2025 am 01:50 AM

sql 大小寫不敏感搜索

How Do I Test My Server Connection Outside of Navicat?

You can test the server connection through command line tools or programming languages. 1. Use the telnet command (telnetyour_server_ipyour_port) to perform a quick check. 2. Use Python and mysql-connector-python libraries for more in-depth testing, running scripts to validate connections and execute queries. This allows you to customize and automate tests, but pay attention to security, error handling and network issues.

Aug 12, 2025 am 01:27 AM

How to set and use SQL modes in MySQL?

SQL mode is used to control the strictness of MySQL when processing data, affecting the processing of invalid or missing values; 2. You can view the current mode through SELECT@@sql_mode or SHOWVARIABLESLIKE'sql_mode'; 3. Use SETSESSION to set the session-level mode, SETGLOBAL to set the global mode, or set it in the my.cnf/my.ini configuration file to take effect permanently; 4. Common mode combinations include strict mode, MySQL8.0 default mode and unrecommended empty mode; 5. Note that some modes have been deprecated or removed, and loose mode should be avoided in production environments. It is recommended to use strict mode after testing in the development environment to ensure data.

Aug 12, 2025 am 01:23 AM

How Does Redis's In-Memory Approach Compare to Traditional Disk-Based Databases?

RedisisiDeal Foredandreal-Time Processing, WhiletraditionDital-Based Database Better Better Negotiation Larged Datasets DrobustDatapersistence.1) RedisExcelsinApplicationsRequingsub-Millisecondlatency, Likecachingandreal-Time Analytics, ButislimitedbymeMoryCo

Aug 12, 2025 am 01:20 AM

How to configure the MySQL server

LocateandedittheMySQLconfigurationfile(my.cnformy.ini)basedonyourOS,creatingitifnecessaryandbackingitupbeforechanges.2.Setbasicserversettingsunder[mysqld],includingserver-id,port,bind-address,datadir,socket,character-set-server=utf8mb4,andskip-name-r

Aug 12, 2025 am 01:13 AM

Building a REST API with Node.js, Express, and MongoDB

Initialize the project and install Express, Mongoose, dotenv, cors, helmet, morgan and nodemon; 2. Use .env files to configure environment variables and connect to MongoDB with Mongoose; 3. Create an Express server and configure middleware; 4. Define the user model; 5. Set up REST routes and controllers to implement CRUD operations; 6. Use Postman and other tools to test the API; 7. Add global error handling to enhance robustness, and finally build a Node.jsRESTAPI with complete CRUD functions and clear structure.

Aug 12, 2025 am 01:04 AM

node.js rest api