By Jennifer Widom, Jeffery D. Ullman

Huge due to Leo over at MAM for this rip

For Database structures and Database layout and alertness classes provided on the junior, senior, and graduate degrees in desktop technology departments.

Written by means of famous laptop scientists, this obtainable and succinct advent to database structures makes a speciality of database layout and use. The authors offer in-depth insurance of databases from the viewpoint of the database clothier, person, and alertness programmer, leaving implementation for later classes. it's the first database structures textual content to hide such themes as UML, algorithms for manipulating dependencies in family members, prolonged relational algebra, personal home page, 3-tier architectures, facts cubes, XML, XPATH, XQuery, XSLT.

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Additional info for A First Course in Database Systems (3rd Edition)

Sample text

An example is: determine whether the number of tuples in a relation is even or odd. 6. 2 W h a t is an Algebra? An algebra, in general, consists of operators and atomic operands. For instance, in the algebra of arithmetic, the atomic operands arc variable- like x and consents like 15. The operators are the usual arithmetic ones: addition, subtraction, multiplication, and division. Any algebra allows us to build s V by applying operators to atomic operands and/or other expressions of the algebra.

2 Basics of t h e Relational Model The relational model gives u< single way to represent daft is a two-dimenOnal table called a nlntmii. 3, i- an example of a relation, which \\ hall call Movies. The K>W8 each repn it a (IIAFTER 22 2. THE RELATIOSM MODEL OF DA I \ movie, and the columns each represent a property of movies. In this section, we shall introduce the most important terminology regarding relations, and illustrate them with the Movies relation. 2a Attributes The columns of a relation are named by attributes] in Fig.

8: Declaring the relation schema for the MovieStar relati benumb is not tl suit ol me weird notion of what typical addresses look like between 0 and : > it is possible to represent a varyingI* nuy ip to 255 l>ytes tn a single byte for the count of characters plus t B to stem the string itself. Commercial system enerally support Ion 'h DEFINING A RELATION SCHEMA IS SQL The gender attribute has values that are a single letter, M or F. Thus, we can safely use a single character as the type of this attribute.

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