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Technical Articles

Database

Mysql Tutorial

How to implement pagination in MySQL

Using LIMIT and OFFSET is the basic method of MySQL paging, which is suitable for small and medium-sized data volumes; for large-scale data or deep paging, index column-based key set paging (such as WHEREid>last_seen_id) should be used to improve performance. Both methods need to ensure the consistency of sorting through ORDERBY. The final choice depends on whether the application scenario needs random page jumps or supports infinite scrolling.

Aug 16, 2025 am 10:50 AM

How to get the last inserted ID in MySQL?

To get the last inserted ID in MySQL, you should use the LAST_INSERT_ID() function. This function returns the last self-increment ID in the current session after insertion. It has session security and is not affected by other clients. It can still obtain the correct result even after executing other queries. If no insertion occurs, it will return 0. For multi-line insertion, return the first generated ID, such as executing INSERTINTOusers(name,email)VALUES('JohnDoe','john@example.com'); followed by SELECTLAST_INSERT_ID(); to obtain the ID of the newly inserted user. When using PHP, you can use $mysqli-&

Aug 16, 2025 am 10:38 AM

mysql

How to use MATCH() AGAINST() for full-text search in MySQL

FULLTEXT index must be created for the text column first, otherwise MATCH()...AGAINST() will report an error; 2. After creating the index, you can use natural language mode, Boolean mode or query extension to search. The natural language mode is sorted by correlation by default. Boolean mode supports operators such as , -, "", *, etc., and query extensions can automatically include related words; 3. Note that MySQL ignores words and common stop words with less than 4 characters by default, and only MyISAM and InnoDB (5.6) support it; 4. To improve performance, FULLTEXT index should be used on text columns to avoid using MATCH() in complex expressions, and Boolean mode is preferred for large data sets, and finally

Aug 16, 2025 am 10:30 AM

How to create a stored procedure in MySQL

To create MySQL stored procedures, you need to use the CREATEPROCEDURE statement and process the delimiter correctly; 1. Use DELIMITER$$ to change the delimiter; 2. Create stored procedures with parameters (IN, OUT, INOUT), including SQL logic in BEGIN...END; 3. Use DELIMITER; restore the delimiter; 4. Use CALL statement to call stored procedures; 5. Complex logic can be implemented in combination with IF, WHILE and other control structures; 6. It is recommended to use DROPPROCEDUREIFEXISTS to avoid duplicate errors; 7. Keep the naming clear and add comments to improve readability. After the entire process is completed, the stored procedure can be successfully created and called.

Aug 16, 2025 am 10:26 AM

mysql stored procedure

What is the purpose of the foreign key ON DELETE CASCADE in MySQL?

ThepurposeoftheONDELETECASCADEoptioninaforeignkeyconstraintinMySQListoautomaticallydeleterowsinachildtablewhenthecorrespondingrowintheparenttableisdeleted,ensuringreferentialintegritybypropagatingdeletionsfromtheparenttothechildtable;forexample,delet

Aug 16, 2025 am 09:47 AM

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