Tag：tree structure
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Time：2021-10-15
1. Demand background On many occasions, we need to recursively query the data in the table. If: 1In menu classification, we often need to obtain the corresponding sub menu from the primary menu. id name pid 1 books 0 2 clothing 0 3 Children’s books 1 4 magazine 1 5 Cartoon 3 6 Bedtime story […]
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Time：2021-10-15
The concept of tree is actually very broad and common. Don’t be alarmed when you see this word, because you can see the application of tree structure in our life every day. For example, the organizational structure of the company: In addition, our family tree, or our family structure, is also a typical tree structure. […]
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Time：2021-9-25
The article begins with the official account of Chen Shu Yi and personal blog.shuyi.tech Tree is a very practical data structure. The most commonly used is the index of database, which is used to find the target value in massive data. For example, if your table has 100 million data. If you use a linked […]
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Time：2021-9-14
The article begins with “Chen Shu Yi” official account and personal blog shuyi.tech. Tree structure is a very important type of data structure. This paper will start with the most basic common tree structure, extend to binary tree, and then to binary lookup tree. Through this idea, let us build the most basic knowledge link […]
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Time：2021-6-5
In Charlie Munger‘s thinking model theory, he has mastered 80 or 90 models, which can solve 90% of the problems. He himself has mastered more than 100 models, which are still updated and iterated. definition Decision tree model: it is composed of a decision graph and possible results, which is used to create a plan […]
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Time：2021-1-13
When developing spring cloud Alibaba microservice application, mysql, redis and Nacos should be set up first. In this paper, docker is used; There are many ways to deploy Nacos. See the official document: Nacos docker, which uses the stand-alone mode and MySQL mode, so it will be associated with MySQL; docker- compose.yaml The definition file […]
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Time：2020-12-24
Author: little brother FuBlog:https://bugstack.cn Precipitation, sharing, growth, let yourself and others can have a harvest! 1、 Preface Reasonable 5 years of development, no use of data structure, you are just doing crud! Most of the time, most programmers suffer from slow query, low efficiency and a lot of associated SQL. The main reason is that […]
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Time：2020-11-8
##I’ve been busy these two days, but I still need to summarize the relevant holes. I hope that my brothers will carefully use the tree structure plug-in in in amazeui ##Then I will briefly talk about our company’s front-end applications: the UI framework is amazeui (commonly known as sister), and the interaction framework is JQ. […]
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Time：2020-9-28
1、 Preface Red black tree is an efficient self balanced binary search tree Rudolf Bayer invented the red black tree in 1978, which was calledSymmetric binary B-trees。 Later, in 1978, it was modified by Leo J. guibas and Robert Sedgewick to the present dayRed and black trees。 The red black tree has good efficiency, which […]
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Time：2020-9-23
1、 With as common table expression It is similar to view, but does not create an object. With as common table expression does not create an object and can only be followed by a select statement 1. Realize recursive query (tree structure) 2. The common table expression can be referenced multiple times in a statement […]
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Time：2020-9-15
As shown in the figure below, a tree structure visualization data graph is needed in recent projects. Many visual plug-ins were found, but no available ones were found. So I drew one myself. The code is as follows. The tree branch is the data rendering returned by the back-end interface, which can display multiple data; […]
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Time：2020-1-17
The essence of the tree is that many pieces of data are displayed in layers according to certain internal relations. Therefore, each piece of data includes data items and interrelations. The data item corresponds to the column in the tree, and the relationship corresponds to which item should be displayed. In pyqt5, there are two […]
