Data Modeling Design

Access database design and programming by Steven Roman

By Steven Roman

I've been utilizing entry and VBA for many years, with none formal education in relational database or programming. during this concise booklet, Steven Roman controlled to provide a powerful origin 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 particularly complicated. Steven Roman prefers DAO to ADO and it shows.

I however supply the ebook five stars, because the first 3 components of the booklet are stellar.

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3 First Normal Form First normal form is very simple. A table scheme is said to be in first normal formif the attribute values are indivisible. To illustrate, we considered in Chapter 1 the question of 49 TEAM FLY PRESENTS including all the authors of a book in a single attribute, called Authors. Here is an example entity: ISBN = 0-55-123456-9 Title = Main Street Authors = Jones, H. and Smith, K. Publisher = Small House Since the table scheme in this case allows more than one author name for the Authors attribute, the scheme is not in first normal form.

1 Implementing a One-to-Many Relationship—Foreign Keys Implementing a one-to-many relationship, such as the PublisherOf relationship, is fairly easy. To illustrate, since {PubID} is a key for the Publishers entity class, we simply add this attribute to the Books entity class. Thus, the Books entity class becomes: Books(ISBN,Title,PubID,Price) The Books table scheme is now: {ISBN,Title,PubID,Price} 35 TEAM FLY PRESENTS and the BOOKS table now appears as shown in Table 3-2 (sorted by PubID). Table 3-2.

The database application then converts this query into a statement in its query language, which in the case of Microsoft Access is Access Structured Query Language, or Access SQL. ) 3. Finally, a special component of Access (known as the Jet Query Engine, which we will discuss again in Chapter 7) executes the SQL statement to produce the desired view of the data. In view of this answer, it is time to turn away from a discussion of database-design issues and turn toward a discussion of issues that will lead us toward database programming and, in particular, programming in query languages such as Access SQL.

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