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Outline of this paper: Due to the large amount of content, this article will start directly from Chapter 5. For the complete version of the document, please click the link below: Nanny level tutorial of data warehouse construction PDF document The contents of the first four chapters are available at the link above Chapter V core of real-t ...

In recent work, you need to optimize the previous web side code editor. As a back-end developer, although I'm not professional, I can only bite the bullet. After consulting a lot of materials, I still optimized some contents. Let's share them here. If there is something wrong, please forgive me. After all, it's very tired to play with pure hand ...

Python wechat ordering applet course video https://edu.csdn.net/course/detail/36074 Python actual combat quantitative transaction financial management system https://edu.csdn.net/course/detail/35475 background Recently, a self-developed Dubbo registration center in charge often received alarms about CPU utilization, so it carried out a wav ...

MySQL 5-day Express - day 3 Introduction to sub query Meaning: select statements that appear in other statements are called subqueries or intra queries External query statements are called external queries or primary queries Classification: Classification by location of sub query: After select from back Support table sub query After having or ...

MySQL view, stored procedure, variable, function, transaction 1. View Meaning: virtual table, but it is the same as that of ordinary table MySQL5. After 1, the characteristics appear through the data of dynamic production Syntax: create view View name as Query statement Create syntax Does it actually occupy physical ...

PHP Application of php annotation Comments are the interpretation and explanation of the code, and the comments will be ignored by the interpreter <?php /* Multiline text note */ ?> <?php //Single line text note ?> Initial experience of php program Each line of php code must end with an English semicolon Th ...

Chapter 15 stored procedures and functions MySQL supports stored procedures and functions from version 5.0. Stored procedures and functions can encapsulate complex SQL logic. Applications do not need to pay attention to the complex SQL logic inside stored procedures and functions, but simply call stored procedures and functions. Overview of s ...

Problem description Because spring boot usually simplifies the configuration and feels a little handmade, I handwritten JDBC and Mybatis in Mybatis class today. At the same time, there were several problems, which are recorded here. 0x01 JDBC insert Chinese garbled code The code is as follows The characters are still normal when the con ...

constraint Constraint is to restrict the fields, so as to ensure the accuracy, effectiveness and integrity of the data. Multiple constraints are separated directly by spaces # Create a student table and set constraints for each field create table student( id int primary key auto_increment, name varchar(10) not null unique ...

1, Sort 1.1 sorting rules Sort using ORDER BY clause ASC (ascend): ascendingDESC (descend): descending order The ORDER BY clause is at the end of the SELECT statement 1.2 single column sorting Example 1: mysql> SELECT last_name, job_id, department_id, hire_date FROM employees ORDER BY hire_date; +-------------+------------+------- ...