-
Summary of several methods for removing duplicate data in SQL (window function for data deduplication)
catalogueMethod 1: distinctMethod 2: groupbyMethod 3: Window functionWhen using SQL to extract and analyze data, we often encounter scenarios where data is duplicated, requiring us to perform data deduplication and subsequent analysis.Taking the sales report of a certain e-commerce company as an example, we commonly use distinct or group by statements to deduplicate data...
Database Operation Tutorial 2023-05-12 12:13:26 -
Complete uninstallation and reinstallation of SQL Server
catalogueComplete uninstallation and reinstallation of SQL Server1. Control Panel Delete Names with&quo; SQL” Procedure for2...
Database Operation Tutorial 2023-05-12 12:13:17 -
Steps to connect to a SQL Server database through Linux installation of ODBC
catalogue1. Download the ODBC installation package2...
Database Operation Tutorial 2023-05-12 12:13:06 -
Sql Server Management Implementation steps for Studio to connect to MySQL
targetGiven MySQL connection parameters (address and user), expect to use Microsoft; SqlServer Management Studio (hereinafter referred to as MSSSMS) connects to MySQL and directly queries or modifies data in MySQL in MSSSMS.realizationStep 1/4: Download and install MySqlConnector/ODBC at MySQL:: DownloadConnector/ODBCSelect the corresponding installation file based on the number of bits in the operating system...
Database Operation Tutorial 2023-05-12 12:13:01 -
Mastering SQL Server Practical Tutorial - SQL Server Installation Guide
cataloguepreface1 Introduction to Database1.1 Classification of databases1...
Database Operation Tutorial 2023-05-12 12:12:14 -
Detailed Solution to SQL Server Installation Failure in Win11
catalogueDelete SQLServer related registryterms of settlement:summaryWin+R opens and runs the input services.msc to view all services and stop all services related to SqlServer, as follows:Open the control panel - uninstall all related software of SQL server;Delete SQLServer related registry1...
Database Operation Tutorial 2023-05-12 12:11:49 -
SQLserver2019 Express Installation and Some Problem Solving
Firstly, I am a technical novice who does not have a thorough understanding of some theoretical issues. If everyone has any problems, we can discuss them together and grow each other...
Database Operation Tutorial 2023-05-12 12:11:46 -
SQL Server 2022 Installation Tutorial (latest recommended)
catalogue1 Configuring and installing SQL Server(1) Download link on official website2 Install visualization tool SSMS3 Common installation errorsSQL Server is a relational typeDatabase Management System(RDBMS), composed ofMicrosoftCompany development and maintenance. It supports Structured Query Language (SQL) and Transact SQL (T-SQL), and is a scalable database platform used to process large amounts of data and support high-performance data access, with a wide range of applications...
Database Operation Tutorial 2023-05-12 12:11:34 -
Detailed explanation of SQL Server's memory management architecture
WindowsSQL Server 2.12...
Database Operation Tutorial 2023-05-12 12:11:27 -
SQL Detailed explanation of server's row level security
catalogue1 Preface2 Description3 Permissions4 Security note: Side channel attack5 Cross functional compatibility6 Example1 PrefaceRow level security allows you to control access to rows in database tables using group membership or execution context.Row level security (RLS) simplifies security design and coding in applications...
Database Operation Tutorial 2023-05-12 12:11:21 -
SQL Server's execution plan
catalogue1 Background2 Display and Save Execution Plan3 Display estimated execution plan4 Display actual execution plan5 Save execution plan in XML format6 Compare and analyze execution plans6.1 Comparison of execution plans6...
Database Operation Tutorial 2023-05-12 12:11:18 -
SQL Detailed explanation of sub queries for Server
catalogue1 Basic knowledge of sub queries2 Sub query rules3 Column names in qualified subqueries4 Multi layer nesting of subqueries5 Related sub queries6 Sub query typesummary1 Basic knowledge of sub queriesA subquery is a query nested within a SELECT, Insert, UPDATE, DELETE statement, or another subquery.You can use subqueries anywhere an expression is allowed...
Database Operation Tutorial 2023-05-12 12:11:06
