Tag：department
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Mybatisplus multi table connection query
Logo picture ppt backplane 16_ 9 2.001. png 1、 Preface （1） Background content The most common selection component of Dao layer in software application technology architecture is mybatis. Friends who are familiar with mybatis know how beautiful mybatis was in the past. XML files are used to solve the problem of complex database access. Today, […]
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MySQL connection query
11.5 connection query (column connection) Question: there are ten pieces of data in the student table and ten pieces of data in the grade table. How many pieces of data are there after connection (Cartesian product): 10 * 10 = 100 Continuous query will produce Cartesian product; Suppose set a = {a, B}, set […]
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Programmers – 10 golden rules for job hunting
Let’s take a look at the 10 golden rules of job hunting under the peak recruitment season of gold, silver and four. It can be said that each one has a certain depth 01: many times, HR doesn’t want you because of your level or your professional skills. But HR has no confidence in itself. […]
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Feishu + Lua realizes enterprise level organizational structure login authentication
This paper introduces how to use the enterprise level authentication gateway, which is based on the enterprise level authentication platform of lua. Login process Let’s first take a look at the overall process of freeboarding the third-party website of flybook: Step 1: the back end of the web page finds that the user is not […]
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Groupby group combined and parallel content ~ further optimized
Pandas questions and answers chapter 013. Today’s article is the last one（After groupby is grouped, how to merge the contents in the column?）Supplement to, focus on recommending group friendsXiao Ming, after the last article was published, he quickly gave me three more optimized solutions, one more concise than the other. With such a good thing, […]
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Vulnerability scanning of learning penetration test II
Series articles： Information collection of learning penetration test Scan port of learning penetration test Recognition operating system for learning penetration testing A brief description of vulnerability scanning in learning penetration testing Remember the proxy server of learning penetration test (keep a low profile) Enumeration of learning penetration tests Vulnerability scanning of learning penetration testing Vulnerability […]
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R data analysis: visual interpretation of mixed effect model. If you don’t understand it, you really can’t help it
Many students asked me about the mixed effect model. They need to talk about some problems many times. Just think about it and post it again. Try to write this article clearly for you. Mixed effect models have many names,Hierarchical Modeling, also known as Mixed Effects Modeling，There are hierarchical models, hierarchical regression models, stochastic models […]
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Using mybatis to easily realize recursive query and stored procedure call
VHR department management module updated! In order to let the partners quickly understand the implementation idea of the department management module, I want to introduce you to the general implementation idea and core code through three short articles. Project address: https://github.com/lenve/vhr It is recommended that you read the previous article first, which will help you […]
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Multi table join query and sub query of MySQL
1. Preliminary preparation #Build table create table department( id int, name varchar(20) ); create table employee( id int, name varchar(20), sex enum(‘male’,’female’), age int, dep_id int ); #Insert data insert into department values (200, ‘technology’), (201, ‘human resources’), (202, ‘sales’), (203, ‘operation’); insert into employee(id,name,sex,age,dep_id) values (1,’cai’,’male’,18,200), (2,’liu’,’female’,48,201), (3,’ling’,’male’,38,201), (4,’liangliang’,’female’,28,202), (5,’acai’,’male’,18,200), (6,’bao’,’female’,18,204) ; 2. Connected […]
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Unexpectedly, python can also make web visualization pages!
This article is forwarded from:blog.csdn.net/KH_FC/article/detail…When it comes to web pages, you may first think of HTML, CSS or JavaScript.This little f will introduce you how to make a data visualization web page with Python, using the streamlit library.Easily convert an Excel data file into a web page for everyone to view online.Whenever you save changes […]
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Spark SQL / hive utility function sharing for big data development
String function1. concatString splicing: concat (STR1, STR2,…, strn), parameters: STR1, STR2 Is the string to be spliced.— return the concatenation of str1、str2、…, strN— SparkSQLselect concat(‘Spark’, ‘SQL’);2. concat_wsAdd a separator between spliced strings: concat_ ws(sep, [str | array(str)]+)。Parameter 1: separator, such as -; Parameter 2: string to be spliced (multiple)— return the concatenation of the strings […]
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[daily question 04.22] 185 All employees with the top three salaries in the Department
The employee table contains all employee information. Each employee has its corresponding job ID, name, salary and department number departmentid. +—-+——-+——–+————–+ | Id | Name | Salary | DepartmentId | +—-+——-+——–+————–+ | 1 | Joe | 85000 | 1 | | 2 | Henry | 80000 | 2 | | 3 | Sam | 60000 […]