In database design, object-oriented programming and design (see object oriented program architecture), has-a (has_a or has a) is a composition relationship where one object (often called the constituted object, or part/constituent/member object) "belongs to" (is part or member of) another object (called the composite type), and behaves according to the rules of ownership. In simple words, has-a relationship in an object is called a member field of an object. Multiple has-a relationships will combine to form a possessive hierarchy. This is to be contrasted with an is-a (is_a or is a) relationship which constitutes a taxonomic hierarchy (subtyping). The decision whether the most logical relationship for an object and its subordinate is not always clearly has-a or is-a. Confusion over such decisions have necessitated the creation of these metalinguistic terms. A good example of the has-a relationship is containers in the C++ STL. To summarize the relations, we have * hypernym-hyponym (supertype-subtype) relations between types (classes) defining a taxonomic hierarchy, where * for an inheritance relation: a hyponym (subtype, subclass) has a type-of (is-a) relationship with its hypernym (supertype, superclass); * holonym-meronym (whole/entity/container-part/constituent/member) relations between types (classes) defining a possessive hierarchy, where * for an aggregation (i.e. without ownership) relation: * a holonym (whole) has a has-a relationship with its meronym (part), * for a composition (i.e. with ownership) relation: * a meronym (constituent) has a part-of relationship with its holonym (entity), * for a containment relation: * a meronym (member) has a relationship with its holonym (container); * concept-object (type-token) relations between types (classes) and objects (instances), where * a token (object) has an instance-of relationship with its type (class). (Wikipedia).
From playlist Belong: What It's Like to Live in the Hyphen
Working with Functions (1 of 2: Notation & Terminology)
More resources available at www.misterwootube.com
From playlist Working with Functions
The Difference Between an Expression and an Equation
This video explains the difference between an expression and an equation. Site: http://mathispower4u.com Blog: http://mathispower4u.wordpress.com
From playlist Introduction to Linear Equations in One Variable
The Definition of a Linear Equation in Two Variables
This video defines a linear equation in to variables and provides examples of the different forms of linear equations. http://mathispower4u.com
From playlist The Coordinate Plane, Plotting Points, and Solutions to Linear Equations in Two Variables
From playlist Open Q&A
DEFINITE AND INDEFINITE ARTICLES - ENGLISH GRAMMAR
We discuss the indefinite articles a, an, and definite article the. 'the' is used when a noun exists and is unique. 'a' or 'an' is used for non-specific nouns. 'a' is used before words that start with a consonant sound. 'an' is used before words that start with a vowel sound. If you want
From playlist English Grammar
Populations, Samples, Parameters, and Statistics
Please Subscribe here, thank you!!! https://goo.gl/JQ8Nys Populations, Samples, Parameters, and Statistics
From playlist Statistics
When women nag.. I just hope I can do the same!
When women nag.. I just hope I can do the same!
From playlist Humor
Introductory courses on Arthur packets 3
Wee Teck Gan National University of Singapore, Singapore Hiraku Atobe Hokkaido University, Japan
From playlist Introduction courses to Arthur packets
Organic Chemistry Drawing Structures - Bond Line, Skeletal, and Condensed Structural Formulas
This organic chemistry video tutorial shows you how to draw lewis structures, bond line structures and skeletal structures including condensed structural formulas. It also shows you how to draw the lewis structures of functional groups such as alkanes, alkenes, alkynes, carboxylic acids,
From playlist New Organic Chemistry Playlist
General Chemistry 1 Review Study Guide - IB, AP, & College Chem Final Exam
This video tutorial study guide review is for students who are taking their first semester of college general chemistry, IB, or AP Chemistry. Even if you’re studying for the general chemistry section of the MCAT, DAT, PCAT, OAT or SAT Subject chemistry test, this video can help give you a
From playlist New AP & General Chemistry Video Playlist
Organic Chemistry 1 Final Exam Review
This organic chemistry 1 final exam review is for students taking a standardize multiple choice exam at the end of their semester. This review contains plenty of examples and practice problems with solutions covering topics commonly taught in a typical organic chemistry course. Here is a
From playlist New Organic Chemistry Playlist
Organic Chemistry Exam 1 - IUPAC Nomenclature, Resonance, Acids & Bases, Newman Projections
This video cover topics commonly tested on exam 1 of the 1st semester of Organic Chemistry. Topics include Resonance Structures, Formal Charge, Drawing Lewis Structures, IUPAC nomenclature, acids and bases, chair conformations, constitutional isomers, and newman projections. Access The F
From playlist New Organic Chemistry Playlist
How To Identify The Number of Lone Pairs on an Atom Using Formal Charge
This organic chemistry video tutorial explains how to determine the number of lone pairs on an atom using formal charge with the use of a formula. Organic Chemistry Exam 1 Playlist: https://bit.ly/3kJnNXU Access The Full 7 Hour Organic Chemistry Exam 1 Video on Patreon: https://www.patre
From playlist New Organic Chemistry Playlist
This organic chemistry video tutorial provides a basic introduction into carbon-13 NMR spectroscopy. It covers broadband decoupled C-NMR where all signals appear as singlets as well as proton-coupled C-13 NMR spectroscopy where the signals appear as doublets, triplets, and quartets based
From playlist New Organic Chemistry Playlist
A Tutorial on Network Protocols
Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
From playlist Computer - Cryptography and Network Security
How To Calculate Oxidation Numbers - Basic Introduction
This chemistry video tutorial provides a basic introduction on how to calculate oxidation numbers. It discusses how to find the oxidation states of elements such as Zn, O2, F2, and P4 and how to find the oxidation numbers of polyatomic ions such as SO4 2-, PO4 3-, NO3-, ClO4-, Hg2+2, O2-2
From playlist New AP & General Chemistry Video Playlist
Struggle To Survive: The Lives of Four Girls Over Ten Years | Real Stories
Noelia. Secret. Daniela. Alaishri. Four baby girls, born in 2005 into precarious circumstances in four different continents. Secret was born right after the civil war in Liberia. Noelia was born to an impoverished indigenous family in Bolivia. Alaishri came to this world in the middle of a
From playlist Extraordinary Stories