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Home

Technical Articles

Database

Mysql Tutorial

How to reverse engineer a database in MySQL Workbench

OpenMySQLWorkbenchandconnecttothetargetdatabaseusingvalidcredentials.2.GotoDatabase>ReverseEngineertolaunchthewizard.3.Confirmorcreateaconnection,thenclickNext.4.Selecttheschema(s)toreverseengineerfromthelistandclickNext.5.Choosespecificdatabaseob

Aug 16, 2025 am 09:19 AM

How to use MySQL Workbench for database design and administration?

Design a database using MySQLWorkbench: After opening the tool, create a new model, double-click the physical mode, build an EER chart by dragging the table to the canvas and defining columns, primary keys, indexes and foreign keys, use relationships to connect the table and forwardly generate SQL or export charts; 2. Connect and manage MySQL server: Add a connection to the homepage, enter a name, host, port, user name and password, test the connection and log in, you can browse table data, execute SQL, view performance charts and manage user permissions; 3. Perform daily management tasks: create users and assign permissions through user and permission functions, use data export/import for backup and recovery, view server logs, processes and status variables, and use performance dashboard to analyze query and generate reports; 4.

Aug 16, 2025 am 05:40 AM

How to temporarily disable foreign key checks in MySQL

To temporarily disable MySQL foreign key checking, you must first perform SETFOREIGN_KEY_CHECKS=0; after disabling constraints, performing data import or table structure modification, you must perform SETFOREIGN_KEY_CHECKS=1; re-enable checking to ensure data integrity. This setting only affects the current session. After the operation, you should verify that the data still meets the foreign key constraints to avoid reference integrity issues.

Aug 16, 2025 am 04:08 AM

How to use the LIKE operator in MySQL?

TheLIKEoperatorinMySQLisusedtosearchforspecifiedpatternsinacolumnwithwildcards%(zeroormorecharacters)and(exactlyonecharacter);1.Use%tomatchanysequence:'John%'findsnamesstartingwithJohn,'%son'findsthoseendingwithson,and'%ali%'findsthosecontainingali;2

Aug 16, 2025 am 03:41 AM

mysql LIKE operator

How to change the default character set and collation of a MySQL database?

Tochangethedefaultcharactersetandcollationforanexistingdatabase,useALTERDATABASEdatabase_nameCHARACTERSET=utf8mb4COLLATE=utf8mb4_unicode_ci,whichsetsdefaultsfornewtablesbutdoesnotaffectexistingones.2.Toupdateexistingtablesandcolumns,useALTERTABLEtabl

Aug 16, 2025 am 02:54 AM

How to use the EXPLAIN statement in MySQL

EXPLAINinMySQLshowstheexecutionplanforaquery,helpingidentifyperformanceissues.1.Itreturnskeydetailslikeid,select_type,table,type,possible_keys,key,key_len,ref,rows,filtered,andExtra.2.Thetypecolumnindicatesaccessmethod,withconst,ref,andrangebeingeffi

Aug 16, 2025 am 01:04 AM

What is the purpose of the LOCK TABLES statement in MySQL?

LOCKTABLESpreventsdatainconsistenciesinnon-transactionalengineslikeMyISAMbyserializingaccess;2.ItallowscontroloverconcurrencyusingREADlocks(shared,forreadingonly)andWRITElocks(exclusive,fortheholderonly);3.Itensuresatomicityacrossmultipletablesbylock

Aug 16, 2025 am 12:36 AM

How to use the GROUP BY clause in MySQL?

TheGROUPBYclauseinMySQLisusedtogrouprowswithidenticalvaluesinspecifiedcolumns,enablingsummarycalculationswithaggregatefunctionslikeCOUNT(),SUM(),AVG(),MAX(),andMIN();forexample,"SELECTregion,COUNT()AStotal_salesFROMsalesGROUPBYregion"groups

Aug 16, 2025 am 12:05 AM

mysql group by

How to handle emoji characters in MySQL

To correctly handle emoji characters in MySQL, you must use the utf8mb4 character set. 1. Make sure that the database, table and column use utf8mb4 and utf8mb4_unicode_ci; 2. Set the client and server character set to utf8mb4 in the MySQL configuration file, and enable innodb_large_prefix; 3. Specify the charset to utf8mb4 when applying the connection; 4. Verify the configuration through SHOWVARIABLES and SHOWCREATETABLE; 5. Pay attention to the utf8mb4 index length limit and limit the index column length to within 191 characters. Only use utf8m in the entire data link

Aug 15, 2025 am 11:14 AM

What is the difference between MyISAM and InnoDB in MySQL?

InnoDB supports transaction and ACID features, but MyISAM does not support it; 2. InnoDB uses row-level locks to improve concurrency performance, while MyISAM uses table-level locks to easily cause blockage; 3. InnoDB supports foreign key constraints to ensure data integrity, but MyISAM does not support it; 4. InnoDB has crash recovery capabilities, and MyISAM is prone to table damage; 5. MyISAM may be faster in pure read scenarios, but InnoDB performs better under mixed loads; 6. Since MySQL5.6, InnoDB has supported full-text indexing and no longer lag behind; 7. InnoDB optimizes data access through buffer pools, and MyISAM only caches indexes. In summary, InnoDB is suitable for most modern applications, and My

Aug 15, 2025 am 11:06 AM

How to import a database using mysqldump

mysqldumpisusedtoexport,notimport,adatabase;toimport,usethemysqlcommand-lineclient.1.Ensureyouhavea.sqldumpfilecreatedviamysqldump.2.Createthetargetdatabaseifitdoesn’texistusingCREATEDATABASE.3.ImporttheSQLfilewithmysql-uusername-pdatabase_name

Aug 15, 2025 am 10:56 AM

Database import

What is a full-text search in MySQL?

Full-textsearchinMySQLenablesefficient,relevance-rankedtextsearchingincharacter-basedcolumnsusingFULLTEXTindexesandMATCH()...AGAINST()syntax,supportingnaturallanguage,boolean,andqueryexpansionmodesprimarilyonInnoDBandMyISAMengines,makingitidealforlar

Aug 15, 2025 am 10:43 AM

mysql research all

How to implement full-text search in MySQL

Create a FULLTEXT index to enable full-text search, which can be added when creating a table or using ALTERTABLE; 2. Use MATCH()...AGAINST() syntax to perform searches, support natural language mode, Boolean mode and query extensions; 3. Pay attention to restrictions and best practices such as minimum word length, stop words, differences between InnoDB and MyISAM; 4. By combining WHERE conditions, using EXPLAIN to analyze and reasonably maintain index optimization performance, MySQL full-text search can meet the needs of most application scenarios.

Aug 15, 2025 am 09:27 AM

mysql research all

How to optimize a MySQL query?

Use appropriate indexes to create indexes for columns involved in WHERE, JOIN, ORDERBY and GROUPBY, give priority to compound indexes but avoid over-index, and verify index usage through EXPLAIN; 2. Write efficient queries, avoid SELECT*, do not use functions on index columns, use LIMIT reasonably, handle OR conditions carefully, and give priority to EXISTS rather than IN subqueries; 3. Optimize JOIN and table structure, ensure that the join columns are indexed, select the correct JOIN type, de-normalize appropriately to reduce JOIN, and use smaller data types to improve efficiency; 4. Use EXPLAIN and EXPLAINFORMAT=JSON to analyze query execution plans,

Aug 15, 2025 am 09:02 AM