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Type Inheritance and Relational Theory
Author Chris Date
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 rec....
Release Date 2016/09 -
Relational Theory for Computer Professionals
Author Chris Date
All of today’s mainstream database products support the SQL language, and relational theory is what SQL is supposed to be based on. But are those products truly relational? Sadly, the answer is no. This book shows you what a real relational product would be like, an....
Release Date 2013/05 -
View Updating and Relational Theory
Author Chris Date
Views are virtual tables. That means they should be updatable, just as "real" or base tables are. In fact, view updatability isn’t just desirable, it’s crucial, for practical reasons as well as theoretical ones. But view updating has always been a controversial topi....
Release Date 2012/12