Judith S. Bowman's The Practical SQL Handbook: Using SQL Variants PDF

By Judith S. Bowman

ISBN-10: 0201703092

ISBN-13: 9780201703092

This consultant to enforcing dependent question Language introduces simple techniques and gives sensible feedback for its program to company reasons. directions are incorporated for the construction of databases, tables, and indexes, with specific consciousness to the retrieval of particular facts, dealing with null values, and using nested queries and a number of tables. An accompanying CD-ROM comprises pattern databases, scripts, and examples from the booklet, as well as a time-limited model of Sybase Adaptive Server wherever software program.

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Bowman, Sandra L. Emerson, Marcy Darnovsky Table of Contents Chapter 2. Designing Databases Reviewing the Database Design Let's review the process by which the design of the bookbiz database was developed. We started by proposing four tables: authors, titles, publishers, and editors. It seems intuitive to design a table for each of these things; the entity-relationship approach states explicitly that each independent entity be represented by a base table. Entity-relationship theory also called for two more base tables one to model the association among titles and authors (titleauthors), and one for the association among titles 57 58 and editors (titleditors).

If the table gets big and unwieldy, why not simply use the projection operation to limit the number of columns that are displayed at one time? Those are reasonable questions. The answer is that the number of columns in a table must often be limited for reasons of consistency (minimizing redundancy), convenience, and performance. The discussion of database design in the next chapter sets out guidelines for deciding which columns to put into which tables. Team-Fly Team-Fly Practical SQL Handbook, The: Using SQL Variants, Fourth Edition By Judith S.

Designers generally start with lists and then move to sketches of the tables and the relationships among them, called data structure diagrams or entity-relationship (E-R) diagrams. 4. Once you have made preliminary decisions about the entities and their attributes, make sure that each entity has an attribute (or group of attributes) that you can use to identify uniquely any row in the future table. This unique identifier is often called the logical primary key. If the natural primary key (author name, book title, company name) is not unique, you may have to look for a different attribute that fills this purpose (Social Security number for an author, ISBN number for a book) or add a column to serve as a surrogate key (assign unique company identifiers or generate incremental order numbers, for example).

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