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Technical Articles

Database

SQL Subqueries vs. CTEs: A Guide to Writing Cleaner and More Efficient Queries

CTEsarebetterforcomplex,reusable,andreadablequeries,whilesubqueriessuitsimple,one-offoperations.1)UseCTEswhenlogicismulti-step,requiresreuse,orenhancesreadability.2)UsesubqueriesforsimplefiltersinWHEREclausesorwhenCTEoverheadexists.3)Performancevarie

Aug 04, 2025 am 06:21 AM

How to connect to Oracle database from Java using JDBC?

To connect to Oracle database, you must first add the OracleJDBC driver and establish a connection. 1. Add the ojdbc driver: When using Maven, you can configure the Oracle repository or manually install the ojdbc8.jar to the local repository. If you do not have to load the driver directly, you can download the JAR and add the classpath; 2. Make a connection: There is no need to explicitly load the driver above JDBC4.0. Use DriverManager.getConnection() to match the correct URL format, such as jdbc:oracle:thin:@localhost:1521:ORCL (SID) or jdbc:oracle:thin:@//loc

Aug 04, 2025 am 06:13 AM

A Guide to the MongoDB Java Driver

Addthemongodb-driver-syncdependencyviaMavenorGradleforsynchronousoperations.2.ConnectusingMongoClientwithaconnectionstring,optionallyincludingcredentials.3.AccessdatabaseandcollectionobjectstoperformCRUD:insertOne/Manyforinsertion,find()withFiltersfo

Aug 04, 2025 am 05:58 AM

Understanding MongoDB Storage Engines: WiredTiger Deep Dive

WiredTigerisMongoDB’sdefaultstorageenginesinceversion3.2,providinghighperformance,scalability,andmodernfeatures.1.Itusesdocument-levellockingandMVCCforhighconcurrency,allowingreadsandwritestoproceedwithoutblockingeachother.2.DataisstoredusingB-trees,

Aug 04, 2025 am 05:49 AM

mongodb

How to implement row-level security in MySQL?

MySQLdoesnotsupportnativerow-levelsecurity(RLS),butitcanbesimulatedusingviews,storedfunctions,andaccesscontrol.2.Createastoredfunctiontoreturnasession-baseduserID,asdirectsessionvariablescannotbeusedinviews.3.Buildaviewthatfiltersdatausingthestoredfu

Aug 04, 2025 am 05:28 AM

What Causes 'Could Not Connect to Server' Errors in Navicat?

The"CouldNotConnecttoServer"errorinNavicatcanberesolvedby:1)checkingyournetworkstabilityandserveravailability,2)verifyingserverdetailslikehostaddress,port,andcredentials,and3)configuringbothlocalandserverfirewallstoallowtheconnection.Thiser

Aug 04, 2025 am 05:12 AM

How to find the version of the running MySQL server?

UseSELECTVERSION();togettheexactrunningMySQLserverversionviaSQL.2.Use\sorSTATUSintheMySQLshellforversionandserverdetails.3.Runmysql--versionormysql-Vfortheclientversion,ormysql-uusername-p-e"SELECTVERSION();"togettheserverversionfromthecomm

Aug 04, 2025 am 05:00 AM

How to use bookmarks in the SQL editor?

Bookmarks are used in SQL editor to quickly jump code positions to improve efficiency. When you write complex queries or frequently switch code segments, bookmarks can be positioned with one click to avoid scrolling searches. Common operations are as follows: DBeaver uses Ctrl F11 to add and F11 to jump; DataGrip/IDEA uses F11 to add unnumbered bookmarks, Ctrl Shift numbers set the number and jump; VSCode installs the plug-in with Ctrl Alt K and Ctrl Alt J to jump. It is recommended to name the bookmark, use it in combination with numbering, and clean invalid bookmarks regularly. If the editor does not support native bookmarks, you can install the plug-in extension function. Use bookmarks reasonably in just a few minutes to learn, but can significantly improve daily SQL development

Aug 04, 2025 am 03:37 AM

How to truncate a table in phpMyAdmin

TotruncateatableinphpMyAdmin,login,selectthedatabaseandtable,thengotothe"Operations"taborusethe"Withselected"dropdownandchoose"Empty"toexecuteTRUNCATE.2.Alternatively,clickthe"SQL"tabandmanuallyrun"TRUNCAT

Aug 04, 2025 am 03:01 AM

How to Change the Default Storage Engine in MySQL?

CheckcurrentstorageengineswithSHOWENGINES;andidentifytheDEFAULT.2.Editmy.cnf(Linux)ormy.ini(Windows)under[mysqld].3.Setdefault-storage-engine=desired_engine(e.g.,MyISAM).4.RestartMySQLserviceusingsystemctlornetcommands.5.VerifywithSHOWVARIABLESLIKE'd

Aug 04, 2025 am 02:53 AM

How to perform a geographical search with spatial data in MySQL?

To perform geographic search, you need to use MySQL's spatial data types and functions. 1. Use the POINT type to store latitude and longitude and create SPATIALINDEX of SRID4326; 2. Use the ST_Distance_Sphere function to find the location within the specified radius, in meters; 3. To improve performance, first use MBRContains combined with bounding box filtering and then calculate the exact distance; 4. When searching for points in polygonal areas, use the ST_Within function to determine whether the points are within the range; be sure to set the SRID correctly and upgrade to MySQL8.0 to obtain better spatial support, and ultimately, various geographic queries can be efficiently implemented.

Aug 04, 2025 am 02:45 AM

How to generate random data for testing?

Generating random data can be achieved through built-in libraries or specialized tools for programming languages. 1. Use built-in modules such as Python's random and secrets, and JavaScript's Math.random() to generate basic types; 2. Use field combinations to enhance the sense of reality, such as name splicing; 3. Use special libraries such as Faker and Faker.js to generate complex structures; 4. Control the data distribution and set weight rules, cover the boundary conditions, and ensure that they meet the test needs.

Aug 04, 2025 am 02:37 AM

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How to Handle Character Sets and Collations in MySQL?

Use utf8mb4 and appropriate collations to correctly handle multilingual text in MySQL. 1. Understand character sets (such as utf8mb4 supports all Unicode characters) and collation rules (such as utf8mb4_unicode_ci is a case-insensitive Unicode sort, and utf8mb4_bin is a binary case-sensitive); 2. Set default character sets and collation rules through configuration files at the server level; 3. Specify character sets and collation rules when database creation or modification; 4. Define character sets and collation rules when table creation or conversion; 5. Specify as needed at the column level, for example, use utf8mb4_bin in password fields; best practices include always using utf8mb4 instead of

Aug 04, 2025 am 02:15 AM

Automating MySQL Schema Migrations with Flyway or Liquibase

Flyway and Liquibase are database automation migration tools that solve problems that are prone to errors, omissions and version confusion in manual operations. Flyway is designed with "convention over configuration" and recognizes SQL files through naming rules. It is suitable for simple scenarios. The advantages are low learning costs and easy integration. Liquibase supports XML/YAML/JSON and other formats, and provides changeSet and rollback functions, which are suitable for complex projects and multi-database environments. When choosing, it should be determined based on project complexity, team technology stack and process requirements. The key is to establish a stable migration process.

Aug 04, 2025 am 02:13 AM