Course Introduction：The difference between clustered index and non-clustered index is: 1. Clustered index stores data rows in the index structure, which is suitable for querying by primary key and range. 2. The non-clustered index stores index key values ??and pointers to data rows, and is suitable for non-primary key column queries.
2025-04-02 comment 0 1131
Course Introduction：Steps to index in Navicat: Connect to the database. Select the table to index. Open Index Manager. Specify the index name. Select the index column. Select the index type. Select a unique index (optional). Click OK to create an index.
2025-04-09 comment 0 987
Course Introduction：The steps to create an index through Navicat are as follows: Select the table to index. Select the Index option. Configure index properties: name, column, type, uniqueness, clustering. Click OK to create an index.
2025-04-09 comment 0 1180
Course Introduction：Oracle index is a special data structure that accelerates data access and improves query performance by storing pointers to data in tables. Oracle provides a variety of index types, including B-Tree index, bitmap index, function index, and hash index. Indexes are especially suitable for data queries that require frequent filtering of specific columns or accessing large tables, but creating and maintaining indexes requires additional space and overhead, and large amounts of indexes may also reduce query efficiency.
2025-04-11 comment 0 306
Course Introduction：Index failure will lead to a degradation in query performance, mainly because data updates do not update the index in time. The columns on the index change. The index is marked as unavailable. Index statistics are outdated. Index syntax error. Other factors (such as tablespace corruption or DB instance failure).
2025-04-11 comment 0 1112
Course Intermediate 3890
Course Introduction：This set of courses is based on the design concept and data structure of MySQL index, index usage scenarios, index classification, index usage scenarios, index performance analysis, query optimization, slow query of MySQL index, etc. It mainly describes the solution of MySQL index optimization. It is very suitable for students who have basic knowledge of MySQL or have certain work experience. The course explains how to solve the problem of slow large-volume queries, how to write an efficient SQL, how to optimize query statements, what is the implementation principle of indexes, how to optimize indexes... and many other difficulties and interview points in SQL index optimization.
Course Elementary 13772
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 82280
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 13144
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 24590
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.
Access path http://tp6.com/index.php/index/index/admin
2020-05-19 17:35:58 0 2 2992
2021-04-17 12:15:48 0 1 1775
Can only access index, not hello
2020-06-21 19:17:53 0 3 1973
URL jump error, method does not exist: app\index\controller\User->{:url('index())
2019-04-26 11:16:17 0 2 2088
