A First Course in Database Systems (3rd Edition) by Jennifer Widom, Jeffery D. Ullman

By Jennifer Widom, Jeffery D. Ullman

Monstrous due to Leo over at MAM for this rip

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

Written by means of recognized laptop scientists, this obtainable and succinct creation to database platforms specializes in database layout and use. The authors offer in-depth insurance of databases from the perspective of the database clothier, consumer, and alertness programmer, leaving implementation for later classes. it's the first database platforms textual content to hide such issues as UML, algorithms for manipulating dependencies in kinfolk, prolonged relational algebra, personal home page, 3-tier architectures, information cubes, XML, XPATH, XQuery, XSLT.

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DATE '0000-00-00' for an unknown b i r t h d a t e . \\ could replace the declarations of gender and b i r t h d a t e in Fig. 8 by: gender CHAR(l) DEFAULT ' ? 4. In that case, ALTER TABLE MovieStar ADD phone CHAR(16) DEFAULT ' u n l i s t e d ' ; ould be the appropriate ALTER TABLE statement. 6 • Declaring Keys There are two ways to declare an attribute or set of attributes to be a key in the CREATE TABLE statement that defines a stored relation. 1. We may declare one attribute to be a key when that attribute is listed in the relation schema.

Anothei interesting point about the MovieStar relation is that we see two new data types. The gender can be a single character. M or F. " which might be a character string of a special form. Starsln This relation connects movies to the stars of that movie, and likewise connects a ar to the movies in which they appeared. Notice that movie represented by the key for Movies the title and year although we have chosen different attribute names 10 emphasize that attributes movieTitle and movieYear represent the movie.

2: The relation Movies with the schema given in Fig. 7. The title is declared as a string of (up to) I00charaet< 32 CHAPTER 2. 7: SQL declaration of the table Movies The year and length attributes are each integers, and the genre is a string of (up to) 10 characters. The decision to allow up to 100 characters for a title arbitrary, but we don't want to limit the lengths of titles too strongly, or long titles would be truncated to fit. We have assumed that 10 characters are enough to represent a genre of movie; again, that is an arbitrary choice, one we could regret if we had a genre with a long name.

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