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Detailed Explanation of SQL Statement Left JOIN Splicing Table
catalogue1. Grammar2...
Database Operation Tutorial 2023-05-12 12:13:34 -
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 -
Summary of three methods for creating SQL Server databases
catalogue1 Creating a database using SQL Server Management Studio2 Create a database using the CREATE DATABASE statement.3 Creating a database using a templatesummaryThere are three ways to create a database...
Database Operation Tutorial 2023-05-12 12:13:22 -
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 -
Solution to Short Term Forced Expiration of SQL Server Database Passwords
1. Open Sqlserver, select the account under the login name, right-click, and click Properties2...
Database Operation Tutorial 2023-05-12 12:13:01 -
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 -
SQLServer Index Fragmentation Query and Processing of Tables
1.2...
Database Operation Tutorial 2023-05-12 12:12:48 -
SQL Server 2012 High Availability Solution
SQL Server 20one2 provides multiple solutions for high availability, such as:one. By using alwayson, virtual IP addresses (VIPs) can be provided to achieve failover and read scalability...
Database Operation Tutorial 2023-05-12 12:12:46 -
sql server The issue of not being able to fully utilize the number of logical cores in the CPU in 2016
Recently, I encountered a problem in my work where sqlserver2016 cannot fully utilize the CPU core. Through analysis tools, I can see that;There are a total of 72 CPU cores, but SQL Only 40 cores can be used, and many people have encountered this problem...
Database Operation Tutorial 2023-05-12 12:12:37 -
Using SQL; Server partition table function improves database read/write performance
Generally speaking, the first bottleneck point in a system is likely to be the database. For example, our production system has a high concurrency...
Database Operation Tutorial 2023-05-12 12:12:34 -
Introduction to SQL Injection with SQL Map
catalogue1 Determine if there is an injection point2 Query all databases under the current user3 Obtain the table names in the database4 Get the field names in the table5 Get Field Content6 Obtain all users of the database7 Obtain the password of the database user8 Obtain the name of the current website database9 Obtain the user name of the current website databaseOriginally, SQL injection was so simpleTaking the first level of SQL injection into the shooting range sqli labs as an example, share the use of sqlmap tools.1 Determine if there is an injection pointUsing commands:Using commands:sqlmap-u" http://49...
Database Operation Tutorial 2023-05-12 12:12:30
