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Technical Articles

Database

How to set auto increment in phpMyAdmin

TosetautoincrementinphpMyAdmin,whencreatinganewtable,defineacolumn(e.g.,id)withINTtype,enabletheA_Icheckbox,andsetitasPRIMARYKEY.2.Foranexistingtable,gotoStructure,clickChangeonthecolumn,ensureit’sINTtype,checkA_I,setasPrimary,andsave.3.Remember:only

Sep 03, 2025 am 05:20 AM

自動(dòng)遞增

How to optimize the MySQL server configuration for performance

Setinnodb_buffer_pool_sizeto70–80%ofRAM(e.g.,12Gon16GBRAM)andconfigureinnodb_buffer_pool_instancesto1per1GBofbufferpool(e.g.,8for12G);keepkey_buffer_sizesmall(32–64M)unlessusingMyISAMheavily;increasetmp_table_sizeandmax_heap_table_sizeto256Mifdisk-ba

Sep 03, 2025 am 05:04 AM

performance mysql optimization

How to use Common Table Expressions (CTEs) in MySQL

ACTEisdefinedusingtheWITHclauseandactsasatemporaryresultsetforasinglequery.2.SimpleCTEsimprovereadabilitybyisolatingcalculationslikeaveragesalary.3.MultipleCTEscanbeusedinonequery,separatedbycommas,tobreaklogicintostepssuchascomputingaveragesandranki

Sep 03, 2025 am 04:15 AM

How to import a CSV file into MySQL

Using LOADDATAINFILE is the fastest way to import CSV files into MySQL. 1. Ensure that the CSV file is formatted correctly and placed in MySQL accessible paths or use LOCAL options; 2. Create a table in MySQL that matches the CSV structure; 3. Execute the LOADDATAINFILE command and set the correct separator, quotes and line breaks, and enable local_infile if necessary; 4. If the file is local, use LOADDATALOCALINFILE; in addition, graphical import can be performed through phpMyAdmin. Pay attention to file permissions, field matching, data type, character encoding and other issues to ensure successful import.

Sep 03, 2025 am 04:11 AM

mysql csv

How to Handle Joins in MongoDB

MongoDBhandlesrelationshipsthroughschemadesigninsteadofSQL-stylejoins.Forone-to-few,embedrelateddata;forone-to-manyormany-to-many,usemanualreferenceswith_id.Use$lookupinaggregationfordynamicjoinsbetweencollections,idealforanalytics.Considerdataduplic

Sep 03, 2025 am 04:07 AM

How to create a new user and assign roles in SQL

The method of creating a new user and assigning a role varies from the database management system: in MySQL, use the CREATEUSER command to create a user and grant permissions directly through the GRANT statement or create a role and assign it to the user; in PostgreSQL, CREATEUSER or CREATEROLE is used to create a user, and the permissions are assigned by the database, schema or table through the GRANT statement, and the role can be directly granted to the user; in SQLServer, you must first use CREATELOGIN to create a server-level login name, then use CREATEUSER to create a database user in the database, and finally assign permissions through the system stored procedures or custom roles, such as

Sep 03, 2025 am 02:28 AM

How to handle errors in a stored procedure in SQL

UseTRY...CATCHblockstotraperrorsinstoredprocedures,ensuringthattheCATCHblockrollsbacktransactionsif@@TRANCOUNT>0andre-throwstheerrorusingTHROW.2.CapturedetailederrorinformationwithERROR_NUMBER(),ERROR_MESSAGE(),ERROR_SEVERITY(),ERROR_STATE(),ERROR

Sep 03, 2025 am 02:14 AM

sql stored procedure

How to manage time zones in MySQL?

Use TIMESTAMP data types and configure time zone support to effectively manage time zones in MySQL. Specific practices include: prioritizing TIMESTAMP over DATETIME to achieve automatic time zone conversion, setting the server time zone to UTC to avoid daylight saving time problems, loading the time zone table through mysql_tzinfo_to_sql to support named time zones, setting the session time zone according to user location to automatically adjust the time, using the CONVERT_TZ() function for explicit time zone conversion, and always storing timestamps in the UTC time zone to ensure data consistency, and ultimately ensuring the accuracy of time applications across regions.

Sep 03, 2025 am 02:09 AM

Navicat vs Dbeaver: which is best?

Navicatisbetterforapolished,user-friendlyexperience,whileDBeaverexcelsincustomizationandsupportingawiderangeofdatabases.Navicatoffersasleekinterfaceandrobustfeaturesforeasydatabasemanagement,whereasDBeaver,beingopen-source,providesflexibilityandexten

Sep 03, 2025 am 02:05 AM

How to get the database name you are connected to in SQL?

MySQL:SELECTDATABASE();returnsthecurrentdatabasenameorNULLifnoneisselected.2.PostgreSQL:SELECTcurrent_database();returnsthenameofthecurrentlyconnecteddatabase.3.SQLServer:SELECTDB_NAME();directlyreturnsthecurrentdatabasename.4.Oracle:SELECTnameFROMv$

Sep 03, 2025 am 01:57 AM

How to set up an alias for phpMyAdmin in Nginx

To set the Nginx alias of phpMyAdmin, first make sure that its installation path is correct, and the common path is /usr/share/phpmyadmin/; then add the location/admin block in the server block of the Nginx configuration file, use alias to point to the phpMyAdmin directory, and configure nested location blocks for the PHP file, explicitly set fastcgi_pass and SCRIPT_FILENAME; then test and overload the Nginx configuration; finally access through http://your-domain.com/admin, optionally add IP restriction or HTTP authentication to enhance security. 1. Confirm

Sep 03, 2025 am 01:41 AM

nginx

How to analyze a query execution plan in SQL

Toanalyzeaqueryexecutionplaneffectively,startbyunderstandingthatitrevealshowthedatabaseexecutesaquery,includingoperationslikescans,seeks,joins,andsorts;usetoolslikeSQLServerManagementStudio,EXPLAINinPostgreSQL,orEXPLAINPLANinOracletoviewestimatedorac

Sep 03, 2025 am 01:31 AM

How to join multiple tables in SQL

To join multiple tables, you need to use multiple JOIN operations in the FROM clause and specify the association conditions. For example, connect three or more tables in sequence based on foreign key relationships through INNERJOIN or LEFTJOIN to ensure that each JOIN has a clear ON condition to avoid Cartesian product. At the same time, use table alias to improve readability, and ultimately achieve cross-table data integration. This method can be extended to any number of association tables, and the desired result can be correctly returned as long as the logic is clear and the connection order is reasonable.

Sep 03, 2025 am 01:23 AM

How to Securely Connect to a Remote MongoDB Instance

SecureremoteMongoDBaccessrequiresenablingauthenticationwithstrongcredentials,configuringTLS/SSLencryptionfordataintransit,restrictingnetworkaccessviafirewallsandbindIPsettings,andusingSSHtunnelingorVPNstopreventpublicexposure,ensuringprotectionagains

Sep 03, 2025 am 01:20 AM