By Mark Levene BSc, PhD, George Loizou BA, PhD (auth.)
Database idea is now in a mature country, and this booklet addresses very important extensions of the relational database version akin to deductive, temporal and object-oriented databases. It presents an summary of database modelling with the Entity-Relationship (ER) version and the relational version delivering the pivot on which the fabric revolves. the most physique of the ebook specializes in the first achievements of relational database concept, together with question languages, integrity constraints, database layout, comput capable queries and concurrency regulate. crucial extensions of the relational version are coated in separate chapters. This booklet may be beneficial to 3rd yr computing device technology undergraduates and postgraduates learning database thought, and also will be of curiosity to researchers and database practitioners who want to recognize extra in regards to the rules underlying relational dat abase administration structures and the issues that confront database researchers.
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Additional info for A Guided Tour of Relational Databases and Beyond
As an example, we may have a STUDENT class type whose object type has attributes name, address, age and course description and an EMPLOYEE class type whose object type has attributes name, address, age and salary. Both students and employees are people so we could have an additional class type PERSON whose object type has attributes name, address and age. Thus EMPLOYEE and STUDENT inherit all the attributes and operations of PERSON and are considered to be its subclasses. Inheritance is useful, since we can add new class types to the system which reuse existing class types.
The same variable can be assigned different constants in different rules. The intuitive semantics of invoking a Datalog rule is that if all the literals in the body of the rule are logically true over the database we are querying, then derive a new fact corresponding to the head of the rule and (temporarily) add it to the database. This process is repeated until no further facts can be derived, technically until a fixpoint is attained. The result of a query which invokes a rule is the set of facts in the resulting database that have the predicate symbol of the head of the rule.
9. Background Material 37 proposition. We sometimes refer to I-place and 2-place predicates as unary and binary predicates, respectively. The free variables of a formula are defined inductively as follows: (i) In an atomic formula all the variables occurring in it are free. (ii) The free variables in F v G or F 1\ Gare the free variables of F and the free variables of G, whilst the free variables of (F) or -, F are the free variables of F. (iii) In VxF or 3xF the free variables are the free variables of F, except for x.
A Guided Tour of Relational Databases and Beyond by Mark Levene BSc, PhD, George Loizou BA, PhD (auth.)