Download Databases Demystified: A Self-Teaching Guide by Andrew Oppel PDF
By Andrew Oppel
Via transparent language, step by step discussions, and quizzes on the finish of every bankruptcy, the writer makes databases effortless. fast examine the middle abilities had to layout, configure, deal with, and manage databases, even if at paintings or at domestic. themes equivalent to exploring various database versions, making plans their layout, minimizing redundant info, designing tables, making use of database layout innovations, and enforcing database defense are lined. this can be that speedy, easy-to-understand instructional that you’ve been searching for.
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Additional resources for Databases Demystified: A Self-Teaching Guide
Example text
Application systems need to process data one record at a time. The relational model advocates argued the following: • Nothing as complicated as the DBTG proposal could possibly be the correct way to manage data. • Set-oriented queries were too difficult in the DBTG language. • The network model had no formal underpinnings in mathematical theory. The debate came to a head at the 1975 ACM SIGMOD (Special Interest Group on Management of Data) conference. Ted Codd and two others debated against Charles 18 Databases Demystified Bachman and two others over the merits of the two models.
For example, the Customer_ID attribute is the unique identifier for the Customer entity, so each customer must have a unique value for that attribute. Keep in mind that a unique identifier can be composed of multiple attributes, but when this happens, it is still considered just one unique identifier. We say attributes are a unit fact because they should be atomic, meaning they cannot be broken down into smaller units in any meaningful way. An attribute is therefore the smallest named unit of data that appears in a database system.
Aside from it being the most prevalent of all the database models in modern business systems, there are other important reasons for this focus, especially for those learning about databases for the first time: • • • • Definition, maintenance, and manipulation of data storage structures is easy. Data is retrieved through simple ad hoc queries. Data is well protected. Well-established ANSI (American National Standards Institute) and ISO (International Organization for Standardization) standards exist.