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Technical Articles

Database

How to use the GROUP BY clause in SQL

TheGROUPBYclausegroupsrowswiththesamevaluesinspecifiedcolumnsforaggregatecalculations.1.Usethebasicsyntax:SELECTcolumn,AGGREGATE_FUNCTION()FROMtableGROUPBYcolumn,includingallnon-aggregatecolumnsinGROUPBY.2.Formultiplecolumns,listallnon-aggregatecolum

Sep 10, 2025 am 03:35 AM

Mastering Queries in MongoDB

Usefind()toretrievemultipledocumentsandfindOne()togetthefirstmatch,optionallyusingprojectiontolimitfields.2.Applycomparisonoperatorslike$gt,$lt,$inandlogicaloperatorslike$and,$orforcomplexfiltering.3.Querynesteddocumentswithdotnotationandarraysusinge

Sep 10, 2025 am 03:25 AM

mongodb Inquire

How to update phpMyAdmin to the latest version

CheckyourcurrentphpMyAdminversionbyviewingthefooterintheinterfaceortheVersion.phpfile,thencompareittothelatestreleaseontheofficialsite.2.Alwaysbackuptheconfig.inc.phpfile,theentirephpMyAdmindirectory,andanycustomizationsbeforeproceeding.3.Chooseyouru

Sep 10, 2025 am 03:21 AM

renew

How to execute a Lua script using the EVAL command?

ToexecuteaLuascriptusingtheEVALcommandinRedis,usethesyntaxEVALscriptnumkeyskey[key...]arg[arg...];1)specifytheLuascriptasastring,2)definethenumberofkeys,3)listthekeysaccessibleviaKEYStable,and4)includeargumentsaccessibleviaARGVtable;youcanalsocallRed

Sep 10, 2025 am 03:03 AM

What Port Does Navicat Use to Connect to Servers?

Navicatusesspecificdefaultportsfordifferentdatabases:1)MySQL:3306,2)PostgreSQL:5432,3)Oracle:1521,4)SQLServer:1433,5)MongoDB:27017;understandingtheseportsiscrucialforsecureandefficientdatabaseconnections.

Sep 10, 2025 am 02:26 AM

How to enable auditing in Oracle?

EnablestandardauditingbysettingAUDIT_TRAIL=DB,restartingthedatabase,andauditingspecificactionslikeSESSIONorSELECT;2.ForOracle12c ,useunifiedauditingbyenablingitviamakecommand,creatingauditpolicies,andqueryingUNIFIED_AUDIT_TRAILforlogs.

Sep 10, 2025 am 02:18 AM

oracle audit

How to add a column to an existing table in Oracle?

UseALTERTABLEwithADDtoaddacolumninOracle.Syntax:ALTERTABLEtable_nameADD(column_namedata_type[DEFAULTvalue][constraints]).ExamplesincludeaddingVARCHAR2,NUMBERwithdefault,NOTNULLDATE,ormultiplecolumns.Newcolumnsappearattheend,defaulttoNULLunlessspecifi

Sep 10, 2025 am 02:15 AM

oracle 添加列

SQL for Graph Databases: Neo4j and SQL Integration

Neo4j cannot use SQL directly, but it can be used in combination through integrated methods. Because Neo4j is a graph database and uses the Cypher query language, unlike SQL's relational data model, it operates on nodes and relationships, rather than tables and rows. For example, SQL query users and orders requires JOIN, while Cypher expresses relationships through MATCH. Despite this, Cypher is logically similar to SQL and is not very difficult to learn. In actual projects, Neo4j is often shared with SQL databases. Common integration methods include: 1. Use ETL tools (such as Talend and Neo4jETL) to convert SQL data into graph structures; 2. Connect SQ through scripting languages ??(such as Python)

Sep 10, 2025 am 01:48 AM

How to view table structure details in Navicat?

There are three ways to view the table structure in Navicat: First, by opening the table designer, double-clicking the table name in the left panel or right-clicking the "Design Table" to view columns, data types, constraints, etc.; Second, use the DDL viewer, right-clicking the table to select "DDL" or find the DDL tab in the properties to view the complete CREATETABLE statement; Third, checking the column dependencies and relationships, and viewing the table associations and dependencies in the "Foreign Key" tab or related parts of the properties of the table designer.

Sep 10, 2025 am 01:03 AM

How to reset the root password in phpMyAdmin

YoucannotresettherootpassworddirectlyinphpMyAdminbecauseitisadatabasemanagementinterface,notapasswordmanagementtool;theMySQLrootpasswordmustberesetattheMySQLlevelbyfollowingthesesteps:1.StoptheMySQLserviceusingsudosystemctlstopmysqlorsudosystemctlsto

Sep 10, 2025 am 12:43 AM

root password

How to find overlapping date ranges in SQL

To determine the overlapping date range in SQL, the core condition is: start1start2, which is applicable to partial overlap, complete inclusion or complete match; for example, querying the subscription record with room_id of 101 and overlapping with the '2025-04-10' to '2025-04-15' time period, you can use SELECT*FROMbookingsWHEREroom_id=101ANDstart_date'2025-04-10'; if you need to find all overlapping date pairs in the table, you can use self-join and add a.id

Sep 09, 2025 am 06:52 AM

sql 重疊日期范圍

How to create a temporary table in MySQL

To create a MySQL temporary table, use the CREATETEMPORARYTABLE statement; 1. The temporary table is only visible in the current session and automatically deletes when the session ends; 2. It can have the same name as the permanent table, and the temporary table is preferred within the session; 3. Use standard statements such as INSERT and SELECT to operate the data; 4. The temporary table can be manually deleted through DROPTEMPORARYTABLE to avoid accidentally deleting permanent tables.

Sep 09, 2025 am 05:06 AM

How to use prepared statements in MySQL?

The use of preprocessing statements can effectively prevent SQL injection and improve the performance of multiple queries. It is separated from the SQL structure and data, first implemented using PREPARE, SET, EXECUTE and DEALLOCATE commands in MySQL, or implemented in programming languages ??such as PHP, Python, Java, etc. through preprocessing mechanisms supported by drivers such as PDO, mysql-connector-python, JDBC. The placeholder (? or named parameters) can only represent values ??and cannot be used for table names, column names or SQL keywords. In the IN clause, placeholders need to be set separately for each value. This method has the advantages of high security, excellent performance and clear code, and has become the best database operation.

Sep 09, 2025 am 04:57 AM

Building Recursive Queries with SQL CTEs

RecursivequeriesinSQLarebuiltusingrecursiveCommonTableExpressions(CTEs)tohandlehierarchicaldata.1.Startwithananchormemberselectingroot-leveldata.2.AddarecursivememberthatreferencestheCTEtotraversethehierarchy.3.CombinebothpartsusingUNIONALL.Forexampl

Sep 09, 2025 am 04:38 AM

recursive query SQL CTE