Get Access database design and programming PDF

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By Steven Roman

ISBN-10: 0596002734

ISBN-13: 9780596002732

I've been utilizing entry and VBA for many years, with none formal education in relational database or programming. during this concise ebook, Steven Roman controlled to provide a powerful starting place within the conception of relational databases, VBA and DAO.

Armed with this information, I now have the arrogance to dig deeper in those 3 issues and research extra complicated material.

One draw back notwithstanding: i discovered the final a part of the ebook on ADO relatively complicated. Steven Roman prefers DAO to ADO and it shows.

I however provide the publication five stars, because the first 3 components of the booklet are stellar.

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Extra info for Access database design and programming

Example text

Database Design Principles In Chapter 1 I tried to present a convincing case for why most databases should be modeled as relational databases, rather than single-table flat databases. I tried to make it clear why I split the single LIBRARY_FLAT table into four separate tables: AUTHORS, BOOKS, PUBLISHERS, and BOOK/AUTHOR. However, for large real-life databases, it is not always clear how to split the data into multiple tables. As I mentioned in Chapter 1, the goal is to minimize redundancy, without losing any information.

The decomposition gives the two tables shown in Tables Table 4-9 and Table 4-10. 57 TEAM FLY PRESENTS Table 4-8. A table with two identical author names AuID AuName A1 A2 PubID John Smith John Smith P1 P2 Table 4-9. Partial decomposition of Table 4-8 AuID AuName A1 A2 John Smith John Smith Table 4-10. Partial decomposition of Table 4-8 AuName PubID John Smith John Smith P1 P2 Unfortunately, if we were to ask Microsoft Access to show us the data for all authors named John Smith, we would get the table shown in Table 4-11, which is not the table we started with!

Thus, the attribute set {PubID} is a key for Publishers, but a foreign key for Books. As with our example, a foreign key provides a reference to the entity class (table scheme) for which it is a key. The table scheme T is called the referencing table scheme, and the table scheme S is called the referenced table scheme. The key that is being referenced in the referenced table scheme is called the referenced key . Note that adding a foreign key to a table scheme does create some duplicate values in the database, but we must expect to add some additional information to the database in order to describe the relationships.

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Access database design and programming by Steven Roman


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