rdbms concepts

Introduction This articleArticleThis article mainly introduces six important concepts in. Net: Stack, heap, value type, reference type, packing, and unpacking. This article first introduces what happens inside the compiler when you declare a variable, and then introduces two important concepts: Stack and heap. Finally, it introduces the value type and reference type, and describes some important principles

It's not too early today. Continue the translation tomorrow. Cocos2d basic concepts Basic concepts of cocos2d The following are some basic concepts of cocos2d:ProgramWhat must be mastered: Scenes Director Layers Sprites Scenes scenario The scenario is implemented by a scene object, more or less, and is part of an independent program

The J2EE platform has several important concepts, such as memory, CLDC, and MIDP. Beginners usually do not have a deep understanding of these concepts, and even have deviations. The purpose of this article is to describe the important concepts related to J2's.1. MemoryWe have been emphasizing that the memory size of mobile information devices is very small an

I. Basic Concepts 1. Document: MongoDB is a Document-based NoSQL database. A document is the basic unit of data in MongoDB and is very similar to rows in relational databases (more complex than rows ). A document consists of multiple key pairs that have the following features: a. The key pairs in the document are ordered (usually the order of the key keys in the document is not important ). B. In the document I. Basic

task of data Warehouse is to organize, summarize and reorganize the information and provide it to the corresponding management decision-maker in time.Q2: Why build a Data warehouse?The enterprise establishes the Data warehouse to fill the existing data storage form already cannot satisfy the information analysis the need. One of the core concepts in Data Warehouse theory is that transactional data and decision-supporting data have different processin

Chapter 2ProgramBasic Concepts What is a programming language? What is language implementation? Many C/C ++ programmers are not familiar with library, development environment, program working principles, and other concepts. This chapter explains these concepts and their relationships. The programming language is actually a set of specifications. Language im

some time ago on the Internet to see the Coursera Open Classroom Big Machine learning Cornerstone Course, more comprehensive and clear machine learning needs of the basic knowledge, theoretical basis to explain. There are several more important concepts and ideas in foundation, first review, and then open the follow-up techniques to learn and summarize the course.1. VC Dimension (VC dimension, very important concept)Ability to shutter the upper limit

TFS is the short name for Team Fundation server and is part of Microsoft VSTS, a core collaboration platform for Microsoft Application Lifecycle Management (ALM) tools, simply as a platform tool for managing and developing the entire lifecycle of software projects.　　TFS is divided into client tiers, application tiers, and data tiers.　　Their data model flows such as:The client layer is divided into the architect client, the developer client, the tester client, and so on.　　The application tiers ar

In C ++ programming languages, there are still many time operations, which can help program developers to meet various time operation requirements in actual programming. We can use the basic concepts about C ++ time introduced in this article to explain the application skills in this aspect. Analysis of the actual operation method of the C ++ Operator Overloading How to Implement C ++ Polymorphism C ++ static member initialization FAQs Basic

My first blog post-- The basic concepts of JSContact the front end has been a whole school year, this is my first time to write a blog, feel the heart installed countless rabbits, very nervous, very excited, also very excited.First write, do not know if there are no routines, need not pay attention to literary talent and so on. No matter, too excited, I will directly write as long as the content it! Here are some of the basic

Talk about namespace-related concepts in PHP 1. What are the namespaces in PHP? What is a namespace? "In a broad sense, namespaces are a way of encapsulating things. This abstract concept can be seen in many places. For example, in an operating system, a directory is used to group related files, and for files in a directory, it plays the role of a namespace. For example, file Foo.txt can exist in both directory/home/greg and/home/other, but t

In the last share of javascript--function parameters and closures--in detail, the closure of the explanation is not deep enough. After a period of learning, I have a new understanding of the concept of closures. So the process of learning to organize into articles, one is to deepen their understanding of closure, the second is to provide readers with the way to learn, to avoid detours.In the javascript--function parameters and closures--detailed in this article, I introduced the concept of closu

In the previous article, we talked about MongoDB installation and management, which involves some concepts, data structures, and some API calls. It doesn't matter if you don't know it. It's actually very simple. This article will briefly introduce it. 1. Document is the core concept of MongoDB. Multiple key-value pairs are put together in an orderly manner. Document is the most basic data structure for MongoDB to store data. In the previous article, w

Oracle's five architecture concepts, oracle ArchitectureOracle's five architecture concepts 1. oracle architecture = [5 concepts] -- 1. database Oracle database only has one database name orcl -- 2. an instance consists of a series of processes and memory structures. The instance can have multiple, but 99.9% uses one instance for use -- 3. data file. dbf data sto

MVC Basic concepts and concepts of process MVCModel: Contains data and behavior. But now it is generally separated: Value Object (data) and service layer (behavior).View: is responsible for the display of the model, is generally displayed to the user interface.Controller: Receives the user request, delegates to the model to handle, after processing completes returns the model data to the view, the view is r

JS is exactly a kind of object-based language, and pure object-oriented language (such as as) a little bit different, JS does not have the concept of class. Although there are inherited but prototype-based inheritance. As the previous segment became more and more valued, Jser used some of the features of JS to create something as playful as a purely object-oriented one. The following is a summary of some of the concepts in JS, a lot of things are from

The four core concepts of CSS and css This article describes several core concepts in CSS, including the box model, position, and float. These are the foundation of CSS and the most common attributes. They seem independent but complement each other. In order to master them, it is necessary to write it out and discuss it. If there are any errors, please correct them. Element type HTML elements can be divided

Learn about database ----- Day 1-some basic concepts of database ----- day1- One database every Day ----- Day 1-some basic concepts of the database ---- Reprinted with the source: coder-pig This section introduces: This section describes some basic concepts of database names so that you can have a basic understanding of the database! 1. "Database" and "Data

of thinking horizontally, and we combine today's system to infer the validation of text boxes, log records, open transactions, open and close databases, and so on. are able to abstract these methods into the form of facets, we just need to be concerned with our business logic.This code is simple, indirect, the development efficiency is greatly improved, more importantly, the reuse efficiency has been greatly improved. Basic Conceptsto learn about AOP. There are several important basic

It is the core meaning of computer programming to solve real life and production problem by computer, so how to solve the problem efficiently becomes the problem that we must pay attention to, and the data structure and algorithm is the two concepts which are introduced in order to solve the problem efficiently, the two concepts are connected and inseparable.Let us clarify their relationship from the follow