Access Database Design & Programming by Steven Roman

By Steven Roman

Access Database layout & Programming takes you at the back of the main points of the entry interface, targeting the common wisdom helpful for entry strength clients or builders to create potent database functions. whilst utilizing software program items with graphical interfaces, we regularly concentration lots at the interface that we disregard concerning the normal recommendations that permit us to appreciate and use the software program successfully. particularly, this booklet specializes in 3 areas:

  • Database design. The booklet presents an relaxing, informative evaluation of database layout that conscientiously exhibits you the way to normalize tables to get rid of redundancy with no wasting data.
  • Queries. The booklet examines multi-table queries (i.e.,various varieties of joins) and indicates the way to enforce them in some way through the use of the entry interface or without delay through the use of entry SQL.
  • Programming. The booklet examines the VBA built-in improvement surroundings (IDE). It then is going on to supply an outstanding advent to information entry items (DAO), ActiveX facts gadgets (ADO), and ADO Extensions for facts Definition and defense (ADOX). those sections function a convenient creation and primer for simple database operations,such as editing a desk lower than software regulate, dynamically including and deleting a checklist, and repositioning a list pointer. The concluding bankruptcy makes a speciality of universal programming difficulties, reminiscent of computing operating sums and evaluating sets.

Unlike different entry books that take the lengthy, distinct method of each subject of outrage to entry programmers, Access Database layout &Programming as an alternative makes a speciality of the center suggestions, allowing programmers to boost good, powerful database purposes. This ebook additionally serves as a 'second path' in entry that offers a really skilled entry consumer who's new to programming with the usually neglected strategies worthwhile to enhance effectively within the Microsoft entry environment.Anyone drawn to studying entry intensive, instead of simply scraping the skin, will take pleasure in and gain immensely from examining this book.

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This index indexes the BOOKS entities first by PubID and then by Title (within each PubID). 6 NULL Values The question of NULLs can be very confusing to the database user, so let us set down the basic principles. Generally speaking, a NULL is a special value that is used for two reasons: • • To indicate that a value is missing or unknown To indicate that a value is not applicable in the current context For instance, consider an author’s table: AUTHORS(AuID,AuName,AuPhone) If a particular author’s phone number is unknown, it is appropriate for that value to be NULL.

This window shows the relationship between PUBLISHERS and BOOKS, listing the key {PubID} in PUBLISHERS and the foreign key {PubID} in BOOKS. ) 5. 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 6. Click the OK button, reopen the BOOKS table, and fix the offending entry (change the PubID field for Hamlet back to 2).

Indeed, one of the obvious problems with the Authors attribute is that it is impossible to sort the data by individual author name. It is also more difficult to, for instance, prepare a mailing label for each author, and so on. Attributes that allow only indivisible values are said to be scalar attributes or atomic attributes. By contrast, an attribute whose values can be, for example, a list of items (such as a list of authors) is said to be a structured attribute . Thus, a table scheme is in first normal form if all of its attributes are atomic.

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