Course Advanced 37249
Course Introduction:"Javascript Three-Level Linkage Video Tutorial" introduces the three-level linkage function developed by JavaScript, which is often used in daily use.
Course Advanced 8505
Course Introduction:"Playing with JavaScript: Three-Level Linkage Examples" introduces the three-level linkage function developed by JavaScript, which is also commonly used in daily work.
Course Elementary 40263
Course Introduction:Functional realization of three-level linkage between provinces, cities and counties
Course Elementary 21833
Course Introduction:Design pattern (Design pattern) is a set of classified and cataloged summary of code design experience that is used repeatedly, known to most people. The purpose of using design patterns is to reuse code, make the code easier to understand by others, and ensure code reliability. There is no doubt that design patterns are win-win for ourselves, others, and the system; design patterns make code writing truly engineering; design patterns are the cornerstone of software engineering, just like the structure of a building.
2018-12-20 17:26:22 0 1 1237
Where are the courses for the three classic modes?
2021-06-24 09:24:51 0 1 996
Course Introduction:The three-level schema of the database is the external schema, the conceptual schema and the internal schema. The user level corresponds to the external schema, the conceptual level corresponds to the conceptual schema, and the physical level corresponds to the internal schema, allowing users at different levels to form different views of the database.
2020-12-08 comment 0 26864
Course Introduction:The three-level schema of the database system does not include data schema, but includes conceptual schema, internal schema and external schema; the external schema is also called sub-schema or user schema, which corresponds to the user level; the schema is also called conceptual schema or logical schema, which corresponds to Conceptual level; internal mode is also called storage mode, which corresponds to the physical level.
2021-07-13 comment 0 9800
Course Introduction:The three-level schema structure of the database system means that the database system consists of three levels: external schema, schema and internal schema. The schema, also called the logical schema, is the common data view for all users; the external schema, also called the user schema, is the data view of database users and is a logical representation of data related to an application; the internal schema, also called the storage schema, is the data within the database. of organization.
2021-07-23 comment 0 53551
Course Introduction:The division of the database's three-level schema architecture is conducive to maintaining the "data independence" of the database. The three-level database schema includes external schema, schema, and internal schema; the two-level images of the three-level schema are the image of the external schema/mode and the image of the schema/internal schema. The image of the external mode/mode ensures logical independence, and the image of the mode/inner mode ensures physical independence.
2021-03-24 comment 0 19018
Course Introduction:1. Open the phone settings and select [Battery]. Turn on the [Super Power Saving Mode] switch to enter the Super Power Saving Mode. 2. After entering the super power saving mode, click the exit icon in the upper left corner of the desktop. A pop-up window will appear at the bottom of the screen. Click to exit the super power saving mode.
2024-03-25 comment 0 1096