MySQL Tutorial

• What Is a Database
• What Is Database System
• Database Access Interfaces
• Database Types
• What is MySQL
• Which Scenarios Is MySQL Suitable For
• MySQL Client and Server Architecture (C/S Architecture)

MySQL Installation and Configuration

• What's New in MySQL 5.7
• MySQL Download Steps
• Install And Config MySQL in Windows
• Check if MySQL Installed Successfully
• Login to MySQL Database
• Linux MySQL Packages
• Uninstall MySQL in Linux CentOS
• Install And Config MySQL in Linux
• MySQL my.cnf Configuration File
• MySQL my.ini Configuration File
• The sql_mode of the MySQL server
• MySql Command Line Client Flashback Solution

MySQL Database Operations

• What is SQL
• Basic writing rules of SQL
• MySQL SHOW DATABASES - View Or Display Database
• MySQL CREATE DATABASE - Create A Database
• MySQL ALTER DATABASE - Modify Database
• MySQL DROP DATABASE - Delete Database
• MySQL USE - Select Database
• MySQL Comments - Single-line And Multi-line Comments
• Case Rules For SQL Statements In MySQL
• MySQL System Help

Database Design

• Database Design Overview
• Database Design Steps
• Three paradigms of Database Design
• Why Should Database Design Use Three Paradigms

MySQL Data Types

• MySQL Data Types Overview
• MySQL Integer Type
• MySQL Decimal Type
• MySQL Date and Time Types
• MySQL String Type
• MySQL Binary Type
• How to Choose Data Type in MySQL
• MySQL Escape Characters
• MySQL System Variables

MySQL Storage Engines

• What Are the MySQL Storage Engines
• MySQL InnoDB Storage Engine
• MySQL MyISAM Storage Engine
• How Data Tables Of Different Storage Engines Represented In The File System
• MySQL View and Modify the Default Storage Engine
• How To Choose MySQL Storage Engine
• MySQL Modify The Storage Engine Of Table

MySQL Basic Operations of Tables

• MySQL CREATE TABLE - Creates A Data Table
• MySQL ALTER TABLE - Modify Data Table
• MySQL Modify/delete Fields
• MySQL DORP TABLE - Delete Data Table
• MySQL Delete The Main Table Associated With Other Tables
• MySQL Display Table Structure
• MySQL Add Fields to Data Table
• Map SQL Statements to File Operations

MySQL Constraints

• MySQL Constraints Overview
• MySQL PRIMARY KEY - Primary Key
• MySQL AUTO_INCREMENT - Primary Key Auto-increment
• MySQL FOREIGN KEY - Foreign Key Constraints
• MySQL UNIQUE KEY - Unique Constraint
• MySQL CHECK - Check Constraints
• MySQL DEFAULT - Default Value
• MySQL NOT NULL - Not Null Constraint
• MySQL View Constraints In Table

MySQL Operators

• MySQL Common Operators Overview
• MySQL Arithmetic Operators
• MySQL Logical Operators
• MySQL Comparison Operators
• MySQL Bitwise Operators
• MySQL Operators Precedence
• MySQL IN and NOT IN

MySQL Function

• MySQL Function Overview

MySQL Manipulate Table Data

• MySQL SELECT - Query Data Table
• MySQL DISTINCT - Filter Duplicate Data
• MySQL AS - Set Alias
• MySQL LIMIT - Limit The Number Of Query Results
• MySQL ORDER BY - Sort Query Results
• MySQL WHERE - Conditional Query
• MySQL LIKE - Fuzzy Query
• MySQL BETWEEN...AND - Range Query
• MySQL IS NULL - Null query
• MySQL GROUP BY - Group Queries
• MySQL HAVING - Filter Grouping
• MySQL CROSS JOIN - Cross Join
• MySQL INNER JOIN - Inner Join
• MySQL LEFT/RIGHT JOIN - Outer Join
• MySQL Subqueries
• MySQL Subqueries Considerations
• MySQL Subqueries' Simple Optimization
• MySQL REGEXP - Regular Expression
• MySQL INSERT - Insert Data (Add Data)
• MySQL UPDATE - Modify Data (Update Data)
• MySQL DELETE - Delete Data
• MySQL TRUNCATE - Empty Table Records
• MySQL UPDATE - Multi-table Association Update
• How Does MySQL Handle Invalid Data Values
• What's SQL Injection and How to Avoid It

MySQL View

• What is MySQL View
• MySQL CREATE VIEW - Create A View
• MySQL Dispaly View
• MySQL ALTER VIEW - Modify View
• MySQL DORP VIEW - Delete View

MySQL Indexes

• MySQL Index
• MySQL Index Types
• MySQL CREATE INDEX - Create Index
• MySQL SHOW INDEX - View Index
• MySQL DROP INDEX - Modify and Delete Indexes
• Why Indexes Don't Work in MySQL
• MySQL Index Design Principles

MySQL Stored Procedure

• What is MySQL Stored Procedure
• MySQL CREATE PROCEDURE - Creates a Stored Procedure
• MySQL View Stored Procedure
• MySQL ALTER PROCEDURE - Modify Stored Procedure
• MySQL DROP PROCEDURE - Delete Stored Procedure
• MySQL Stored Functions
• MySQL Calls Stored Procedures And Functions
• MySQL Define and Assign Variable
• MySQL Define Conditions And Handlers
• MySQL Cursor
• MySQL Flow Control Statement

MySQL Trigger

• What is MySQL Trigger
• MySQL CREATE TRIGGER - Create Trigger
• MySQL View Trigger
• MySQL DROP TRIGGER - Modify and Delete Triggers
• MySQL Event and Timed Task
• MySQL Create Events
• MySQL Display Events
• MySQL Modify And Delete Events

MySQL Transactions

• Database Transactions Concepts and Features
• MySQL Transactions Syntax and Execution Flow
• MySQL Transactions Autocommit (On And Off)
• MySQL Transaction Isolation Level
• MySQL View and Modify Transaction Isolation Level
• MySQL Lock Mechanism
• MySQL Table Locks/Row Locks/Page Locks
• MySQL InnoDB Row Lock
• Mysql Deadlocks

MySQL Character Set

• MySQL Character Set And Collation Rules
• MySQL View Character Set And Collation Rules
• MySQL Default Character Set And Collation Rules
• MySQL Choose the Correct Character Set

MySQL User Management

• MySQL user Privilege Table
• MySQL db, tables_priv, columns_priv and procs_priv Privilege Tables
• MySQL Create User
• MySQL RENAME USER - Modify User
• MySQL DROP/DELETE USER - Delete User
• MySQL SHOW GRANTS - View User Privileges
• MySQL GRANT - User Authorization
• MySQL REVOKE - Remove User Privileges
• MySQL Login And Logout Server
• MySQL root User Change Ordinary User Password
• MySQL Change Root Password
• MySQL Reset Root Password
• MySQL Change Password
• MySQL Privilege Control

MySQL Database Backup and Recovery

• Why Databases Need To Be Backed Up
• MySQL Backup Types
• MySQL Cold Backup And Recovery
• Physical Files Required For MySQL Cold Backup
• MySQL Hot Backup And Recovery
• MySQL mysqldump - Backup Database
• MySQL Restore Database (mysql Command)
• MySQL SELECT...INTO OUTFILE - Export Table Data to File
• MySQL LOAD DATA - Recovery Database

MySQL Log

• MySQL Logs And Classification
• MySQL Error Log
• MySQL Binary Log
• MySQL Use Binary Log To Restore The Database
• MySQL General Query Log
• MySQL Slow Query Log
• MySQL Set Log Output Mode

MySQL Performance Optimization

• MySQL Performance Optimization Overview
• MySQL Analyze Query by EXPLAIN And DESCRIBE
• Optimize Indexes
• Optimize MySQL Database Structure
• Optimize The Speed of Inserting Data in MySQL
• Optimize MySQ Server

Uninstall MySQL in Linux CentOS (Preparation Before Installing MySQL in Linux)

Before installing MySQL on a Linux operating system, check to see if an older version of MySQL is installed on your current system. If there is, it is best to uninstall the old version of MySQL first, otherwise there may be conflicts.

The steps for uninstalling the old version of MySQL are as follows: 

1) Use the following command to check whether MySQL is installed in the current system. The command and running results are as follows:

[root@bogon Desktop]# rpm -qa|grep -i mysql
mysql-libs-5.1.71-1.el6.x86_64

The result shows that the MySQL installed on Linux is the mysql-libs-5.1.71-1.el6.x86_64 version.

The following 2 points should be noted:

• Starting from MySQL 5.0, the service name of MySQL has been changed to mysql instead of mysqld of 4.*.
• Under CentOS 7, the default installed database is MariaDB. Before installing MySQL, you need to uninstall the MariaDB database.

2) Stop the MySQL service, uninstall mysql-libs-5.1.71-1.el6.x86_64, the command is as follows:

service mysql stop
rpm -e --nodeps mysql-libs-5.1.71-1.el6.x86_64

Note: If you get an error, you can use the command rpm -ev mysql-libs-5.1.71-1.el6.x86_64 --nodeps or rpm -e --noscripts mysql-libs-5.1.71-1.el6.x86_64 to uninstall MySQL .

3) Find the directory of the previous version of MySQL, and delete the files and libraries of the old version.

find / -name mysql

After the MySQL directory is displayed, the directory can be deleted using the following command.

rm -rf 目录名

4) Find out again whether MySQL is installed in the current system.

rpm -qa|grep -i mysql

If no result is displayed, it means that it has been uninstalled cleanly, and then you can directly install MySQL. 

1. Uninstall MySQL in CentOS:

   • Description: Uninstall MySQL package from CentOS using the package manager.
   • Command:

     sudo yum remove mysql-server mysql
     

2. Remove MySQL from CentOS system:

   • Description: Remove MySQL server and client packages from the CentOS system.
   • Command:

     sudo yum remove mysql-server mysql
     

3. Cleanly uninstall MySQL on Linux:

   • Description: Cleanly uninstall MySQL, removing configuration files and dependencies.
   • Commands:

     sudo yum remove mysql-server mysql
     sudo rm -rf /var/lib/mysql
     sudo rm -rf /etc/my.cnf
     

4. Preparing for MySQL reinstall on CentOS:

   • Description: Remove existing MySQL packages and prepare for a fresh installation.
   • Commands:

     sudo yum remove mysql-server mysql
     sudo yum clean all
     

5. Backup MySQL databases before uninstall:

   • Description: Before uninstalling MySQL, it's crucial to back up your databases to avoid data loss.
   • Command (for individual databases):

     mysqldump -u [username] -p[password] [database_name] > backup.sql
     

6. Uninstall MySQL and dependencies CentOS:

   • Description: Uninstall MySQL and its dependencies from CentOS.
   • Command:

     sudo yum autoremove mysql-server mysql
     

7. Purge MySQL from CentOS:

   • Description: Purge MySQL packages and configuration files from CentOS.
   • Command:

     sudo yum erase mysql-server mysql
     

8. Completely remove MySQL on Linux:

   • Description: Completely remove MySQL, including packages, configuration files, and data directories.
   • Commands:

     sudo yum erase mysql-server mysql
     sudo rm -rf /var/lib/mysql
     sudo rm -rf /etc/my.cnf
     

9. CentOS uninstall MySQL and reinstall steps:

   • Description: Steps to uninstall MySQL on CentOS and prepare for a fresh installation.
   • Commands:

     sudo yum remove mysql-server mysql
     sudo yum clean all
     

10. Check for existing MySQL installations CentOS:

    • Description: Verify if MySQL is already installed on CentOS.
    • Command:

      rpm -qa | grep mysql