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day27 Today's content 1. multi-table query 2. thing 3. DCL multi-table query # Create department table CREATE TABLE dept( id INT PRIMARY KEY AUTO_INCREMENT, NAME VARCHAR(20) ); INSERT INTO dept (NAME) VALUES ('Development Department'),('Marketing Department'),('Finance Department'); # Create employee table CREATE TABLE emp( id INT PRIM ...

Mysql database is already the most popular database at present. Because its community version is open source, free, cross platform, easy to install and configure, rich and powerful functions, it is regarded as the preferred database by most enterprises. Especially for NET developers, enter In the era of. NET Core, most people have also changed ...

DML data manipulation language of MySQL core knowledge MySQL deep analysis table data addition Create table Employee list of a company create table employee( empno int primary key comment 'Employee number', ename carchar(20) commenr 'Employee name', job carchar(20) commenr 'Employee position', mgr int comment 'Employee super ...

Project introduction Project github: github link This project is based on C + + language, Mr. Chen Shuo's muduo network library, mysql database and json CPP. The server listens to two ports, one for processing http requests and the other for processing json data sent. This project cooperates with a qt+opencv license plate recognition front ...

catalogue     1. mysql website and download the installation package 2. Click to unzip to the directory you want to store 3. Configure SQL 4. Create front end engineering catalog 5. mysql database and table creation 6. Service and debugging interface   1. mysql website and download the installation package Download address: https:// ...

Overall article directory 1, Current chapter contents 2, Database introduction Database functions: Data definition function. DBMS provides corresponding data language to define database structureDDL usually includes creation, modification and deletion commands for each object. Data manipulation function. DBMS provides data manipul ...

SQL statement 1. What is SQL? SQL:Structured Query Language, or Structured Query Language. That is, it defines the rules for operating all relational databases. Each database operates in a different way, called a dialect. Note: If you do not have a MySQL database installed, you can refer to the article MySQL(1) | Detailed installation a ...

MySQL database basic topic is coming! Hee-hee, this term I learned the fundamentals of MySQL database, and then I have sorted out some simple questions that are useful for MySQL database, I hope you can help! Say nothing, go dry! Table structure management 1. Objectives 1. Creation and deletion of MySQL database 2. Create, modify, delete ...

Automatically create database tables through classes, so as to get rid of the trouble of manually creating tables When we are working on a java project, when we create a class, if we want to create a corresponding database to store multiple pieces of information, if there are many properties of this class, how can we avoid making mistakes when ...

Comprehensive experiment of database system design Experimental Report Download There are all three experimental reports Link: link About experiment It is suggested to watch the video sent by the teacher first (the teacher said it is inconvenient to send it out, so it won't be sent here). Go to a station to search c# student information ...