Database: Step-By-Step by Mark L. Gillenson

By Mark L. Gillenson

A "user pleasant" creation to the sector of database. The publication information the research of garage and administration, explaining the foundations in the back of database and its huge diversity of subtopics in a transparent, step by step demeanour. furthermore, the publication addresses simple info definitions and buildings, entry equipment, database administration platforms features and methods, database layout, administration facets of our surroundings, and different similar themes within the box.

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4 Product Let and . Then a relation Q that contains all possible combinations of concatenated pairs r and s THEORY AND PRACTICE OF RELATIONAL DATABASES 53 Fig. 5 Schematic representation of intersection Fig. 6 of product representation of product is said to product of R and S; the concatenation operator ~ is defined as follows: The Cartesian product is a binary operation that combines two relations together yielding a new relation whose tuples contain all the attributes originally held by the tuples of R and S.

Also, the occurrence ↔ 1 loses its uniqueness and does not refer to any particular Real World entity. 6 Let DIRECTORY (F-Name, Surname, Address, Tel-number) represent a telephone directory of a certain area. Suppose, for the sake of this example, that the key in this relation is (F-Name, Surname). 7. Neither of the three tuples marked NOT ALLOWED represent any useful information to a potential user, nor do they refer to any Real World entity occurrence. 7 Let ACCOUNT (Acc#, Customer-Name, Balance) with a primary key ACC# be a relation in a bank database.

The smallest unit of data in the relational model is an attribute. Attributes draw their values from suitable domains; a domain thus contains all possible values for a particular attribute. g. by listing all the possible values, or by specifying conditions that all values in that domain must conform to. 1 The possible domain definitions for the attributes week-day, date–of–birth and person-name (of some person living in certain community) would be: {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday} BIRTH-DATES = {any string x of the form dd–mm–yyyy, such that 01–01– 1850

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