Course Introduction：B-Tree indexes in MySQL accelerate data retrieval by creating indexes on columns of tables, significantly reducing the amount of data that needs to be scanned during queries, thereby improving query performance. 1) Create a B-Tree index using a CREATEINDEX statement, such as CREATEINDEXidx_ageONemployees(age). 2) The working principle of B-Tree index includes structure, query process, and automatic adjustment during insertion and deletion. 3) Use the EXPLAIN command to debug the problem that the index is not used. 4) Performance optimization suggestions include selecting appropriate columns, using overlay indexes, regular maintenance, as well as maintaining code readability and testing and monitoring.
2025-04-08 comment 0 1129
Course Introduction：MySQL supports four index types: B-Tree, Hash, Full-text, and Spatial. 1.B-Tree index is suitable for equal value search, range query and sorting. 2. Hash index is suitable for equal value searches, but does not support range query and sorting. 3. Full-text index is used for full-text search and is suitable for processing large amounts of text data. 4. Spatial index is used for geospatial data query and is suitable for GIS applications.
2025-04-02 comment 0 1134
Course Introduction：The article discusses B-tree, Hash, and Full-Text SQL indexes, their use cases, and performance impacts. Full-Text indexes are best for searching large text fields.
2025-03-14 comment 0 1096
Course Introduction：The article discusses different MySQL indexes (B-tree, Hash, Fulltext, Spatial, Unique, Composite) and their impact on query performance. It advises on choosing the right index type based on query needs.
2025-03-19 comment 0 757
Course Introduction：The article discusses four types of MySQL indexes: B-tree, Hash, Fulltext, and Spatial, each optimized for different query types. The main focus is on their specific uses and performance differences.Character count: 159
2025-03-18 comment 0 788
Course Elementary 3327
Course Introduction：If you have any questions, add WeChat: Le-studyg; this course is a course for Swoole extension, aiming to deeply explore the Swoole multi-process model and its implementation principles. Through this course, learners will understand the concepts, principles and applications of the multi-process model in the Swoole framework. The course content covers the basic concepts of the Swoole multi-process model, inter-process communication, process management, process pools, etc., helping learners comprehensively master the technical points of Swoole multi-process programming, so as to better apply it to actual projects. Through the study of this course, students will be able to have a deeper understanding of the Swoole multi-process model and provide strong support for the development of high-performance, high-concurrency network applications.
Course Elementary 13825
Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.
Course Elementary 82361
Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).
Course Elementary 13181
Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.
Course Elementary 24630
Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.
2021-02-21 19:08:28 0 1 1347
javascript - tree structure data traversal
How to traverse tree-structured data like this?
2017-05-19 10:10:21 0 2 934
How to efficiently build a tree from a tree structure
2024-03-28 13:53:08 0 1 548
mysql - Database storage structure and index issues
2017-06-22 11:54:32 0 1 1045
