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

Chris J Date

ISBN 10: 1491959991 / ISBN 13: 9781491959992

Edité par O'reilly Media Okt 2016, 2016

A propos de cet article

Neuware - 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 provide for code reuse in applications. For these reasons, many languages, including the standard database language SQL, have long supported such relationships. However, there doesn't seem to be any consensus in the community at large on a formal, rigorous, and abstract model of inheritance. This book proposes such a model, one that enjoys several advantages over other approaches, not the least of which it is that it's fully compatible with the well known relational model of data.

N° de réf. du vendeur 9781491959992

Détails bibliographiques

• Titre: Type Inheritance and Relational Theory : Subtypes, Supertypes, and Substitutability
• Éditeur: O'reilly Media Okt 2016
• Date de parution: 2016
• Langue: anglais
• ISBN à 10 chiffres: 1491959991
• ISBN à 13 chiffres: 9781491959992
• Reliure: Taschenbuch
• État de l'article: Neu
• Dimensions: 233 L x 179 H x 35 P (en millimètres) 233 millimètres de largeur par 179 millimètres de hauteur par 35 millimètres de profondeur
• Poids: 984 grammes

A propos de ce titre

Synopsis

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 provide for code reuse in applications. For these reasons, many languages, including the standard database language SQL, have long supported such relationships. However, there doesn't seem to be any consensus in the community at large on a formal, rigorous, and abstract model of inheritance. This book proposes such a model, one that enjoys several advantages over other approaches, not the least of which it is that it's fully compatible with the well known relational model of data.

Topics the model covers include:

• Both single and multiple inheritance
• Scalar, tuple, and relation inheritance
• Type lattices and union and intersection types
• Polymorphism and substitutability
• Compile time and run time binding

All of these topics are described in detail in the book, with numerous illustrative examples, exercises, and answers. The book also discusses several alternative approaches. In particular, it includes a detailed discussion and analysis of inheritance as supported in the SQL standard.

À propos de l?auteur

C.J. Date has a stature that is unique within the database industry. C.J. is a prolific writer, and is well-known for his best-selling textbook: An Introduction to Database Systems (Addison Wesley). C.J. is an exceptionally clear-thinking writer who can lay out principles and theory in a way easily understood by his audience.