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Technical Articles

Database

How to manage user accounts in phpMyAdmin

AccesstheUseraccountstabinphpMyAdminusinganadminaccounttomanageMySQLusers.2.Createanewuserbyclicking"Adduseraccount",settingausername,host,strongpassword,andassigningminimalnecessaryprivileges.3.Editexistingusersbyselecting"Editprivile

Aug 05, 2025 am 09:22 AM

User Management

How does SQL handle NULL in a comparison (e.g., WHERE column = NULL)?

Special attention is required when handling NULL values in SQL, because NULL represents unknown or missing values and does not follow conventional comparison logic. 1. Use ISNULL to check the NULL value, because =NULL will not take effect, it will return UNKNOWN; 2. Be careful when using NOTIN. If the subquery contains NULL value, the entire condition may return UNKNOWN. Use NOTEXISTS instead or filter NULL; 3. Aggregation functions such as COUNT, SUM, and AVG will ignore the NULL value, COUNT(*) counts all rows, and COUNT(column) only counts non-NULL values. Understanding these rules helps avoid common pitfalls in query results.

Aug 05, 2025 am 08:49 AM

Best Practices for Connection Pool Management in MongoDB Applications

UnderstandhowconnectionpoolsworkbyrecognizingthatMongoDBdriversreuseconnectionstoreduceoverhead,limitconcurrentoperationsviapoolsize,andrequirepropermanagementtoavoidtimeoutsorresourceexhaustion.2.Tuneconnectionpoolsettingsbasedonworkloadbyconfigurin

Aug 05, 2025 am 08:46 AM

What are the best practices for writing MySQL triggers?

Keeptriggerssimpleandfocusedbyperformingasingletaskanddelegatingcomplexlogictostoredproceduresorapplicationcode,ascomplextriggersarehardertodebugandtest.2.Avoidrecursiveorcascadingsideeffectsbypreventinginfiniteloopsthroughcarefuldesignandthoroughtes

Aug 05, 2025 am 08:25 AM

Best Practices mysql trigger

Optimizing MySQL for Real-time Stock Market Data

TooptimizeMySQLforreal-timestockmarketdata,focusonthefollowingsteps:1)UseInnoDBasthestorageenginefortransactions,crashrecovery,androw-levellocking,andenableinnodb_file_per_table;2)Designefficientindexes,especiallyacompoundindexon(symbol,timestamp),an

Aug 05, 2025 am 08:24 AM

Leveraging MongoDB Atlas Search for Powerful Full-Text Search Capabilities

CreateadeclarativeAtlasSearchindexusingJSONtospecifyfieldslikename,description,andcategorywithdynamic:falseforcontrol.2.Usethe$searchaggregationstageinsteadof$match,enablingtextsearchacrossspecifiedfieldswithrelevancescoring.3.Boostrelevancebyassigni

Aug 05, 2025 am 08:21 AM

How do you find the last inserted identity value in SQL?

Tofindthelastinsertedidentityvalue,usethedatabase-specificfunction:1.SQLServer:SCOPE_IDENTITY()issafestasitreturnsthelastidentityvaluewithinthesamescope,avoidingissueswithtriggers;2.MySQL:LAST_INSERT_ID()returnsthelastauto-incrementvalueforthecurrent

Aug 05, 2025 am 07:31 AM

Implementing MySQL Read-Write Splitting for Performance

MySQL read and write separation reduces the load on the main library and improves performance by distributing read requests to the slave library. 1. Reading and writing separation depends on the master-slave replication mechanism. The master library processes write operations and records binlog. The slave library plays the log synchronized data. Pay attention to the delay and consistency issues; 2. The implementation methods include application-level manual routing, middleware proxy (such as MyCat, ProxySQL) and ORM framework support, each with its advantages and disadvantages; 3. Precautions include avoiding dirty reads, reasonably managing connection pools, monitoring master-slave delays, reasonably allocating read requests and conducting sufficient tests and verification to ensure data consistency and system stability.

Aug 05, 2025 am 06:47 AM

How to find and remove orphaned records in MySQL?

Tofindorphanedrecords,useaLEFTJOINtoidentifychildrecordswithoutvalidparentreferences,suchas:SELECTo.*FROMordersoLEFTJOINusersuONo.user_id=u.idWHEREu.idISNULL.2.Todeleteorphanedrecords,useDELETEwithLEFTJOINorNOTEXISTS,forexample:DELETEoFROMordersoLEFT

Aug 05, 2025 am 06:35 AM

What is the Purpose of the Binary Log in MySQL?

ThebinaryloginMySQLiscriticalforreplication,recovery,andauditing;1.Inreplication,themasterrecordschangesinthebinarylog,andslavesuseI/OandSQLthreadstocopyandapplytheseeventsforsynchronization;2.Forpoint-in-timerecovery,itenablesrestoringdatatoaspecifi

Aug 05, 2025 am 06:09 AM

From Excel to SQL: A Transitional Guide for Data Professionals

SQLrequiresamindsetshiftfrominteractivespreadsheetstodeclarativequeries;2.Excel’sFILTER,VLOOKUP,SUMIF,pivottables,andduplicateremovalmaptoSQL’sWHERE,JOIN,GROUPBYwithaggregates,conditionalaggregation,andDISTINCT/ROW_NUMBER();3.SQLexcelsinhandlinglarge

Aug 05, 2025 am 06:08 AM

What is the difference between OLTP and OLAP systems in the context of SQL?

OLTPisforreal-timetransactionprocessing,whileOLAPisforcomplexdataanalysis;2.OLTPusesnormalizedschemastoensureintegrity,whereasOLAPusesdenormalizedstarorsnowflakeschemasforqueryspeed;3.OLTPhandlesshort,frequentquerieslikeinsertsandupdates,whileOLAPrun

Aug 05, 2025 am 05:57 AM

How to implement a tagging system in a MySQL database?

Useamany-to-manyrelationshipwithajunctiontabletolinkitemsandtagsviathreetables:items,tags,anditem_tags.2.Whenaddingtags,checkforexistingtagsinthetagstable,insertifnecessary,thencreatemappingsinitem_tagsusingtransactionsforconsistency.3.Queryitemsbyta

Aug 05, 2025 am 05:41 AM

mysql

How to change WordPress URL in phpMyAdmin

AccessphpMyAdminviayourhostingcontrolpanelandselectthecorrectWordPressdatabase.2.Locatethewp_optionstable,theneditthesiteurlandhomerows,updatingtheiroption_valuetothenewfullURL(e.g.,https://newdomain.com),savingeachchange.3.Ifmigratingdomains,avoiddi

Aug 05, 2025 am 05:33 AM