Type Inheritance and Relational Theory: Subtypes, Supertypes, and Substitutability

by C.J. Date

Book Overview

Type inheritance is that phenomenon according to which we can say, for example, that every square is also a rectangle, and so properties that apply to rectangles in general apply to squares in particular. In other words, squares are a subtype of rectangles, and rectangles are a supertype of squares. Recognizing and acting upon such subtype / supertype relationships provides numerous benefits: Certainly it can help in data modeling, and it can also...

• Format: Paperback
• Language: English
• ISBN: 1491959991
• ISBN13: 9781491959992
• Release Date: October 2016
• Publisher: O'Reilly Media
• Length: 569 Pages
• Weight: 2.10 lbs.
• Dimensions: 1.2" x 7.0" x 9.2"