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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 -
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 -
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 2012 Building Database AlwaysOn (Database High Availability Cluster)
To achieve a highly available database cluster, the following aspects need to be considered:1. Database selectionSelect a database that supports high availability...
Database Operation Tutorial 2023-05-12 12:12:42 -
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 -
SQL Server Detailed steps for changing the default backup directory for databases
This article also applies to the latest version of SQL server 2008, 2016, 2019Open SSMSSelect Database, right-click, PropertiesSelect&quo; Permissions”, Click on&quo; View Server Permissions&# quo;Select&quo; Database Settings;, Modify&quo; Backup; Box PathNote: After changing the backup path of a database, it is valid for all databases. Please note that the final prompt indicates whether to save...
Database Operation Tutorial 2023-05-12 12:12:17 -
VS comes with SQL; Server changes password and connects for use
Next, please follow these steps:After completing the above steps, you should be able to usesaConnect the user and their password to the SQLServerExpressLocalDB instance in the program. Simply use" in the connection string; UserId=sa" And" Password=YourPassword" (Among themYourPasswordIt is the actual password you set...
Database Operation Tutorial 2023-05-12 12:12:09 -
SQL Server judges whether there is summary for database, table, column, view, stored procedure and function
catalogue1 Introduction Overview2 Database related judgments2.1...
Database Operation Tutorial 2023-05-12 12:11:57 -
Summary of 5 Methods for Creating Indexes in SQL Server
cataloguePreliminary preparation:Create clustered indexMethod 1Method 2Create composite indexCreate overlay indexCreate Unique IndexFilter IndexSummary:Preliminary preparation:createtableEmployee(IDintnotnullprimarykey,Namenvarchar(4),Credit_ Card_ IDvarbinary(max));--- Be careful with this data type. goExplanation: All indexes on this table will be deleted before creating the next index...
Database Operation Tutorial 2023-05-12 12:11:54
