There are about 20 mysql series documents, covering all the MySQL knowledge points from basic to advanced. After reading it, you will definitely not lose! Subvert your perception.
Part 1: Some basic knowledge of MySQL
This is the first in the mysql series.
Main content of this article
1. Background introduction
2. Introduction to database basics
3. mysql installation
4. Introduction to some commonly used commands in mysql
5. SQL Classification
Due to the length of the article, all PDF files cannot be uploaded; there is a free way to receive them at the end of the article
Part 2: Introduction to data types in MySQL
This is the second article in the mysql series.
Environment: mysql5.7.25, demo in cmd command.
main content
1. Introduce commonly used data types in mysql
2. Correspondence between mysql type and java type
3. Some suggestions for data type selection
Part 3: Some commands commonly used by MySQL administrators
This is the third article in the mysql series.
Environment: mysql5.7.25, demo in cmd command.
In the process of playing mysql, when many friends are playing mysql on the cloud, why can’t I log in when I create a user? Why is there no permission? Wait for all kinds of problems, after reading this article, these are not problems.
Main content of this article
1. Introduce the working principle of Mysql permissions
2. View all users
3. Create User
4. Change password
5. Authorize users
6. View user permissions
7. Revoke user permissions
8. Delete user
9. Explanation of authorization principles
10. Summary
Part 4: Summary of DDL Common Operations
This is the fourth article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
DDL: Data Definition Language data definition language, mainly used to perform some management operations on databases and tables. Such as: building a database, deleting a database, building a table, modifying a table, deleting a table, adding, deleting, and modifying columns, etc.
The grammar involved in the article uses [] to include optional content, which is explained in detail below.
Part 5: DML common operations
This is the fifth article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
DML (Data Manipulation Language) data manipulation language, with INSERT, UPDATE, and DELETE as the core instructions, which represent insert, update, and delete respectively. They are instructions that must be mastered . Select in DML and SQL is commonly known as CRUD (add, delete, modify, and check). ).
The grammar involved in the article uses [] to include optional content, which is explained in detail below.
Chapter 6: Select to check the basics
This is the sixth in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
DQL (Data QueryLanguage): Data query language, in layman's terms, is to get data from the database, and send an instruction to the database according to the syntax of DQL, and the database will return the data as required.
DQL is divided into multiple articles, this article belongs to the first article.
Part 7: Select condition query
This is the seventh article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
E-commerce: We want to view all orders of a certain user, or we want to view all orders of a certain user in a certain period of time. At this time, we need to filter the order table data, filter according to user and time, and get us The desired result.
At this time, we need to use conditional queries to operate on the specified table, and we need to understand the common gameplay of conditional queries in SQL.
Chapter 8: Sorting and paging (order by, limit)
This is the eighth article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
The code contained in [] means optional, and the symbol separated by | means optional.
Contents of this chapter
1. Detailed sorting query
2. Detailed limit
3. The pit of limit
4. Pit in paging query
Chapter 9: Group query (group by, having)
This is the 9th article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
Contents of this article
1. Group query syntax
2. Aggregate functions
3. Single field grouping
4. Multi-field grouping
5. Filter data before grouping
6. Filter data after grouping
7. The difference between where and having
8. Sort after grouping
9. where & group by & having & order by & limit 一起协作
10. Pit in mysql group
11. The use of in multi-column query
Chapter 10: Summary of mysql commonly used functions
This is the tenth article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
Chapter 11: In-depth understanding of connection query and principle
This is the 11th article in Mysql series.
Environment: mysql5.7.25, demo in cmd command.
When the data we query comes from multiple tables, we need to use join queries. The usage rate of join queries is very high. I hope everyone must master it.
This article content
1. Cartesian product
2. Internal connection
3. External connection
4. Left connection
5. Right connection
6. The principle of table connection
7. Use java to realize connection query and deepen understanding
Part 12: Subquery (this part is very important, master must)
This is the twelfth article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
This chapter is very important.
Chapter 13: Talking about the divine pit caused by NULL in detail, it is hard to guard against
This is the 13th article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
Chapter 14: Detailed explanation of affairs
This is the 14th article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
During the development process, database transactions are often used, so this chapter is very important.
Contents of this article
1. What is a transaction and what is it for?
2. Several characteristics of transactions
3. Detailed explanation of common operation instructions
4. Detailed explanation of transaction isolation level
5. Detailed explanation of dirty reading, non-repeatable reading, repeatable reading and phantom reading
6. Demonstrate the phenomena produced by various isolation levels
7. About the choice of isolation level
Part 15: Views
This is the 15th article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
Chapter 16: Variables
This is the 16th article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
The code contained in [] means optional, and the symbol separated by | means optional.
This article content
Explain the use of system variables
Explain the use of custom variables
Chapter 17: Detailed Explanation of Stored Procedures & Custom Functions
This is the 17th article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
This article content
Explain the use of stored procedures
Explain the use of custom functions
Chapter 18: Introduction to flow control statements
This is the 18th article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
The code contained in [] means optional, and the symbol separated by | means optional.
Contents of this article
if function case statement if structure while loop
repeat loop loop loop
Loop body control statement
Chapter 19: Detailed Cursor
This is the 19th article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
The code contained in [] means optional, and the symbol separated by | means optional.
Contents of this article
The cursor defines the role of the cursor
Steps to use cursor
Detailed cursor execution process single cursor example
Nested cursor example
Chapter 20: Detailed Explanation of Exception Capture and Handling
This is the 20th article in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
The code contained in [] means optional, and the symbol separated by | means optional.
Contents of this article
Detailed anomaly classification
Detailed internal exception
Detailed external exception
Master optimistic locking to solve the problem of concurrent modification of data errors
Update affects the processing when the number of rows is inconsistent with the expected result
Chapter 21: What is an index?
This is the 21st in the Mysql series.
This article starts with 3 consecutive articles explaining mysql index:
1. In the first chapter, what is an index?
2. The second chapter explains the principle of index in Mysql
3. The third chapter explains the keyword explain in detail with the index
Chapter 22: Detailed Explanation of MySQL Index Principle
This is the 22nd article in the Mysql series.
Part 23: MySQL Index Management
This is the 23rd in the Mysql series.
Environment: mysql5.7.25, demo in cmd command.
The code contained in [] means optional, and the symbol separated by | means optional.
Chapter 24: How to use the index correctly?
This is the 24th article in the Mysql series.
Learning index is mainly to write faster SQL. When we write SQL, we need to know why SQL uses index? Why does some SQL not take the index? SQL will go those indexes, why does it go? We need to understand its principle and understand the internal specific process, so that it can be used more smoothly and can write more efficient SQL. In this article, we just understand these issues.
Chapter 25: Analysis of the extraction and application of where conditions in sql in the database
This is the 25th article in the Mysql series.
Part 26: Talk about how to use MySQL to implement distributed locks
This is the 26th article in the Mysql series.
In this article, we use mysql to implement a distributed lock.
Part 27: How does MySQL ensure that data is not lost? There are a few points we can learn from
This is the 27th article in the Mysql series.
In this article, let’s take a look at how mysql ensures that data is not lost. Through this article, we can understand the principle of mysql to ensure that data is not lost, learn the excellent design points inside, and then we will learn from these excellent design points for practical application , Deepen understanding.
The above is part of the documents of the MySQL series of knowledge points I have compiled. Friends who need this document can get it for free with the assistant VX below!
