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Technical Articles

Database

How to use stored procedures in phpMyAdmin

TocreateastoredprocedureinphpMyAdmin,useDELIMITER$$todefinetheprocedurewithCREATEPROCEDURE,thenresetwithDELIMITER;andexecuteintheSQLtab.2.ViewstoredproceduresbyselectingthedatabaseandnavigatingtotheRoutinestab,whereallproceduresarelistedwithoptionsto

Aug 26, 2025 am 05:16 AM

stored procedure

Can you explain the RANK(), DENSE_RANK(), and ROW_NUMBER() window functions in SQL?

RANK(),DENSE_RANK(),andROW_NUMBER()handletiesdifferently:1.ROW_NUMBER()assignsuniquesequentialnumbersregardlessofties,resultinginnogapsbutarbitraryorderingamongties(e.g.,1,2,3,4,5);2.RANK()givestiedrowsthesamerankbutleavesgapsinthesequenceafterward,s

Aug 26, 2025 am 05:02 AM

sql Window Functions

What is the difference between a temporary table and a table variable in MySQL?

MySQLdoesnotsupporttablevariableslikeSQLServer;2.Theonlybuilt-inoptionfortemporaryresultsetsinMySQLisCREATETEMPORARYTABLE;3.Temporarytablesaresession-specific,supportindexesandjoins,andareautomaticallydroppedwhenthesessionends;4.User-definedvariables

Aug 26, 2025 am 04:51 AM

How to retrieve a range of members by their rank (index) using ZRANGE?

The ZRANGE command is used to obtain a subset from an ordered set based on the ranking of members, and the ranking starts at 0. When using it, specify the starting and end rankings (both included), such as ZRANGEplayers04 obtains the top 5 players; add WITHSCORES parameters to return scores at the same time; support negative indexes, such as ZRANGEplayers-3-1 obtains the last three members; suitable for scenarios such as ranking, paging, and real-time dashboards; note that no errors will be reported when processing index values ??beyond the range, and the results will be returned in ascending order by default.

Aug 26, 2025 am 04:49 AM

How do you perform a cross join in SQL and what is its result?

AcrossjoininSQLcombineseveryrowfromonetablewitheveryrowfromanother,producingaCartesianproduct.1.UsetheCROSSJOINkeyword:SELECTFROMtable1CROSSJOINtable2.2.Alternatively,listtablesintheFROMclausewithoutaWHEREorONclause:SELECTFROMtable1,table2.3.Theresul

Aug 26, 2025 am 04:42 AM

How to get the list of databases on a MySQL server?

To get the database list on the MySQL server, the most common method is to use the SHOWDATABASES command, and after logging in to MySQL, execute SHOWDATABASES; it can display all databases that the current user has permission to access, and system databases such as information_schema, mysql, performance_schema and sys are usually listed; in addition, the same results can be obtained by querying the INFORMATION_SCHEMA.SCHEMATA table, which is suitable for scenarios where filtering or scripting operations are required, such as using SELECTSCHEMA_NAMEFROMINFORMATION_SCHEMA_SCHEMA_

Aug 26, 2025 am 04:17 AM

How to insert multiple rows quickly in Navicat?

There are four ways to quickly insert multi-row data in Navicat: 1. Add multiple records at once using SQL batch insertion statements, which is suitable for large-scale data operations; 2. Use the import wizard to import batches from external data sources such as Excel and CSV, which is suitable for non-SQL users; 3. Add rows continuously in the table view, which is suitable for manual input of a small amount of data; 4. Paste existing table data into the Navicat table view through copy and paste to improve the efficiency of entering medium-sized data. Each method is suitable for different scenarios and can be flexibly selected based on the source and quantity of data.

Aug 26, 2025 am 04:14 AM

How to calculate the difference between two dates in SQL

Calculating the difference between two dates depends on the SQL database used, but most databases support DATEDIFF function or interval operation; in MySQL, DATEDIFF() calculates the difference in the number of days or TIMESTAMPDIFF() calculates other units, SQLServer uses DATEDIFF() and takes the unit as the first parameter, PostgreSQL handles the difference in dates directly or uses EXTRACT and AGE() functions, while SQLite uses julianday() function to calculate the difference in days. The syntax of each database is different but the core concept is consistent. You need to select a suitable function according to the specific system and pay attention to the date type and time boundary issues, and finally achieve accurate results.

Aug 26, 2025 am 04:02 AM

What is the role of my.cnf or my.ini file in MySQL?

Themy.cnformy.inifileisessentialforcustomizingMySQLbehavior,asitallowsadministratorstocontrolserversettings,optimizeperformance,managelogs,andapplyconfigurationstospecificcomponents;withoutit,MySQLrunsondefaults,limitingperformance,security,andmonito

Aug 26, 2025 am 03:49 AM

How to search for data within a table in phpMyAdmin

TosearchfordatainatableinphpMyAdmin,usethe"Search"tabtoselectcolumnsandenterasearchtermwithoptionalwildcardslike%forpartialmatches.2.Formorecontrol,gotothe"SQL"tabandwriteacustomSELECTquerywithaWHEREclause,usingconditions,logicalo

Aug 26, 2025 am 03:42 AM

How to Model Time-Series Data in MongoDB

UseMongoDB’snativetime-seriescollectionsforoptimaltime-seriesdatahandling.CreatecollectionswithtimeField,optionalmetaField,andgranularitytoenhanceingestionandstorage.DesigndocumentsaroundquerypatternsbyplacingfrequentlyfilteredmetadatainmetaFieldandm

Aug 26, 2025 am 02:59 AM

What is a foreign key in MySQL?

AforeignkeyinMySQLisacolumnorsetofcolumnsthatreferencesaprimaryoruniquekeyinanothertabletoenforcereferentialintegrity;itensuresdataconsistencybyallowingonlyvalidvaluesfromthereferencedtable,preventsaccidentaldeletionofrelatedrecordsdependingonconstra

Aug 26, 2025 am 02:49 AM

How Does Redis Scale Differently Than Traditional Databases?

Redisscalesdifferentlyfromtraditionaldatabasesthroughin-memoryoperations,sharding,andreplication.1)In-memoryoperationsallowRedistohandlehigh-speedread/writetasks.2)Shardingdistributesdataacrossmultipleinstancesforhorizontalscaling.3)Replicationensure

Aug 26, 2025 am 02:15 AM

redis database

How to check if a column is an identity column in SQL?

Usesys.identity_columnstogetdetailedidentitycolumninformationincludingseedandincrementvalues;2.UseCOLUMNPROPERTY()functionforaquickyes/nocheckbyreturning1ifthecolumnisidentity,0otherwise,orNULLifinvalid;3.AvoidINFORMATION_SCHEMA.COLUMNSasitdoesnotexp

Aug 26, 2025 am 02:14 AM