By Andy Oppel
Studying DATABASE basics simply received plenty more uncomplicated! you can now layout, construct, and deal with an absolutely useful database very easily. completely up to date to hide the most recent applied sciences and methods, Databases Demystified, moment version grants the hands-on assist you have to start. Written in a step by step layout, this functional advisor covers equipment that may be used with any database, together with Microsoft entry, MySQL, Microsoft SQL Server, and Oracle. you will know about relational database elements, database queries, SQL, the database lifestyles cycle, logical database layout utilizing normalization, and actual database layout. info and procedure modeling, database safeguard, on-line Analytical Processing (OLAP), and XML also are coated. precise examples and concise factors make it effortless to appreciate the cloth, and end-of-chapter quizzes and a last examination support toughen studying. it is a no-brainer! you will find out how you can: Create and run database queries utilizing the forms-based question device in Microsoft entry Write SQL statements and queries Use entity dating diagrams (ERDs) for facts modeling layout actual tables attach databases to clients, computers, and purposes safe database information deal with cursor processing, transaction administration, and function tuning combine XML files and items into databases easy adequate for a newbie, yet demanding adequate for a complicated scholar, Databases Demystified, moment variation is your self-paced consultant to studying common database techniques.
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Additional info for Databases DeMYSTiFieD, 2nd Edition
In practice, one-to-one relationships that are mandatory in both directions and not transferable represent a design flaw that should be corrected by combining the two entities. After all, isn’t an account receivable merely more information about the customer? We’re not going to collect data about an account receivable, but rather the information in the Account Receivable entity is data we collect about the customer. On the other hand, if we buy our financial software from an independent software vendor (a common practice), the software would almost certainly come with a predefined database that it supports, so we may have no choice but to live with this situation.
Pointers told the computer system where the related record was physically located, much as a street address directs us to a particular building in a city or a URL directs us to a particular web page or file on the Internet. Each pointer establishes a parent-child relationship, also called a one-to-many relationship, where one parent may have many children, but each child may have only one parent. This is similar to the situation in a traditional business organization, where each manager may have many employees as direct reports, but each employee may have only one manager.
TERMS: intersection Table an intersection table is placed in the middle of a many-to-many relationship to hold the data that is common to the intersection of the two entities. once placed, the intersection table transforms the many-to-many relationships into two one-to-many relationships with the intersection table on the “many” side of both relationships. 35 36 D ata b a s e s D e mys tifieD Recursive Relationships So far we have covered relationships between entities of two different types. However, relationships can exist between entity instances of the same type.
Databases DeMYSTiFieD, 2nd Edition by Andy Oppel