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Technical Articles

Database

Mysql Tutorial

How to use the BETWEEN operator in MySQL?

TheBETWEENoperatorinMySQLisusedtofilterresultswithinaninclusiverangeofvalues,workingwithnumbers,text,anddates;forexample,"SELECT*FROMproductsWHEREpriceBETWEEN10AND50"retrievesproductswithpricesfrom10to50,includingbothbounds,andthesamelogica

Aug 24, 2025 pm 01:02 PM

How to grant privileges to a user in MySQL

ConnecttoMySQLasaprivilegeduserlikerootusingmysql-uroot-p.2.UsetheGRANTstatementtoassignspecificprivilegessuchasSELECT,INSERT,UPDATE,DELETE,orALLPRIVILEGESonspecifieddatabasesortablestoauser,forexample:GRANTSELECT,INSERTONmydb.*TO'john'@'localhost'ID

Aug 24, 2025 pm 12:05 PM

How to use row-level locks in MySQL

Row-levellocksinMySQLareautomaticallyappliedbyInnoDBduringwriteoperationsonindexedcolumns,lockingonlyspecificrows;2.UseSELECT...FORUPDATEtoexplicitlylockrowsforexclusiveaccessduringatransaction,preventingothertransactionsfrommodifyingthem;3.UseSELECT

Aug 24, 2025 am 09:58 AM

How to use variables in MySQL queries?

Use@prefixtodeclareuser-definedvariablesinMySQL,whicharesession-specificandpersistduringtheconnection.2.AssignvaluesusingSETorSELECTwiththe:=operatorinSELECTstatementstodistinguishassignmentfromcomparison.3.ReusevariablesinSELECT,INSERT,UPDATE,andDEL

Aug 24, 2025 am 09:46 AM

mysql variable

How to Handle Large Objects (BLOBs and TEXT) in MySQL?

ChoosetheappropriateBLOBorTEXTtypebasedonsizeneeds,usingMEDIUMBLOB/MEDIUMTEXTformostcasesandreservingLONGtypesforgigabyte-scaledata,whileusingTEXTforcharacterdataandBLOBforbinarydata.2.Storelargefilesexternallyinfilesystemsorobjectstorage(e.g.,AWSS3)

Aug 24, 2025 am 09:43 AM

mysql blob

How to use the REGEXP operator for pattern matching in MySQL?

MySQL's REGEXP operator is used to perform regular expression pattern matching, which is more powerful than LIKE. 1. The basic syntax is SELECTcolumn_nameFROMtable_nameWHEREcolumn_nameREGEXP'pattern', which can be replaced by RLIKE; 2.^ represents the beginning of a string, $ represents the end,. To match any single character, special characters such as \\., such as \\.; 3. Common patterns include [abc] matching characters in brackets, [a-z] matching range, [^abc] matching characters in non-branches, (abc|def) matching multiple options; 4. Example: ^john matches strings starting with john, \\.

Aug 24, 2025 am 09:20 AM

What is database replication in MySQL?

MySQLreplicationimprovesdataavailability,reliability,andperformancebycopyingdatafromamasterservertooneormoreslaveservers;itenableshighavailabilitywithfailoversupport,offloadsbackupsandreadqueriestoslaves,andreduceslatencythroughgeographicdistribution

Aug 24, 2025 am 08:50 AM

How to use the INFORMATION_SCHEMA database in MySQL

INFORMATION_SCHEMA is a read-only system database used in MySQL to access database metadata, which contains information about tables, columns, indexes, permissions, etc.; 1. It provides views such as TABLES, COLUMNS, SCHEMATA, etc. to describe the database structure; 2. You can query all databases through SELECTSCHEMA_NAMEFROMINFORMATION_SCHEMA.SCHEMATA, or list tables and views in the specified database through TABLES table; 3. Use COLUMNS table to obtain column details of the table, such as column names, data types, and whether null values ??are allowed, etc.; 4. Get index information through STATISTICS table, KEY_

Aug 24, 2025 am 08:11 AM