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Using sql statements to operate the database Create database Syntax: CREATE DATABASE [IF NOT EXISTS] db_name [CHARACTER SET charset_name] [COLLATE collation_name] Where charset_name is the default character set specified for the database Collate is the default collation rule specified for the database (collation rule is a set of rules us ...

Course notes Day28 Database paradigm Database transaction Database view Backup and restore Chapter I database paradigm Section 01 basic theory What is the database paradigm? When designing a table, we need to follow some database design specifications. Why use paradigms? In order to reduce the data redundancy in the database. ( ...

After finishing these 33 questions, we don't have to worry about the written sql test any more. We don't talk much nonsense. Let's go straight to the dry goods!!! 1: Title 1. Query the Sname, Ssex, and Class columns of all records in the Student table. 2. Query all the companies of teachers, that is, the non duplicate Depart ment column. 3. ...

Damon database command line installation and initialization examples are introduced in detail 1. Environmental description Virtual machine and version: VMware ® Workstation 16 Pro Operating system and version: RedHat 7 one Database and version: DM8 Operating system installation options: minimize installation DM official website download ...

1. Project background and demand analysis 1.1 project background E-mail is widely used in enterprises. E-mail is generally used for communication and business between employees and customers. However, due to the lack of awareness of managing e-mail in many enterprises, a large number of e-mail management is chaotic, and there are some hid ...

catalogue 1, DDL(Data Definition Language) 1. Create database 2. Query database 3. Modify database 4. Delete database 5. Create table Management table (internal table) External table Conversion between two tables Modify table Delete table Clear table 2, DML data operation 1. Data import Load data into a table (load) Insert data ...

Simple message board implemented by JavaWeb+MySQL Hello, dear friends, I'm the Bug terminator ~. Unconsciously, I've been on holiday for 2 weeks. I've come to Monday. Today, I decided to update the article. Today, I'll bring you some experience in my learning process and avoid pitfalls for my friends. Let's share today Message board requ ...

Chapter 25 JDBC and database connection pool 821. Schematic diagram of JDBC JDBC provides a unified interface for accessing different databases and shields the use details for users. Java programmers can use JDBC API to connect to any database system that provides jdbc driver, so as to complete various operations on the database The Java de ...

background Recently, the main application scenario for the function of persisting vector data to Spatialite database is to request vector data in a certain range from db in real time, obtain its information (point set, style and field), present it on the map, or carry out vector information processing related businesses through the RTree ...

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