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 e-book, Steven Roman controlled to offer a powerful origin within the thought of relational databases, VBA and DAO.

Armed with this data, I now have the boldness to dig deeper in those 3 themes and research extra complex material.

One draw back although: i discovered the final a part of the e-book on ADO rather complicated. Steven Roman prefers DAO to ADO and it shows.

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

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To see this, consider the proper subsets of the key. These are: {Title} and {PubID} But none of the dependencies: {Title} {Title} {PubID} {PubID} {PageCount} {Price} {PageCount} {Price} hold for this table scheme. After all, knowing the title does not determine the book, since there may be many books of the same title, published by different publishers. Hence, the table is in second normal form. It is also not correct to say that: {PageCount} {Price} holds, because different publishers may use different price schemes based on page count.

Think of the potential confusion that would otherwise ensue, in view of the fact that we may rearrange the columns of a table! Now that we have defined the concept of a table, we can say that it is common to define a relational database as a finite collection of tables. However, this definition belies the fact that the tables also model the relationships between the entity classes, as we will see. 2 A Short Glossary To help keep the various database terms clear, let us collect their definitions in one place: Entity An object about which the database is designed to store information.

Now check the Enforce Referential Integrity box, and click the Create button. You should get the message in Figure 3-6. The problem is, of course, the dangling reference that we created by changing the PubID field in the BOOKS table to refer to a nonexistent publisher. Figure 3-6. Error message due to dangling reference 42 TEAM FLY PRESENTS 6. Click the OK button, reopen the BOOKS table, and fix the offending entry (change the PubID field for Hamlet back to 2). Then close the BOOKS table, and re-establish the relationship between PUBLISHERS and BOOKS.

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