By PhD Steven Roman
Whereas specific at intermediate Microsoft entry clients who're beginner programmers, this moment version of the bestselling entry Database layout & Programming may still entice all degrees of entry builders. particularly, the hot variation includes:
- A dialogue of entry' new VBA built-in improvement atmosphere utilized by observe, Excel, and PowerPoint
Expanded assurance of the VBA language itself, according to reader requests
Discussions of Microsoft's most up-to-date facts entry expertise, referred to as energetic facts gadgets (or ADO), and Open Database Connectivity (ODBC), that's in detail attached with ADO
For beginner programmers, this e-book makes a speciality of in general overlooked, yet however crucial, wisdom for constructing potent database functions. Its therapy of database layout and queries supplies intermediate and complicated builders a consolidated resource of information, whereas its programming chapters represent a convenient connection with uncomplicated operations that may be played utilizing DAO or the entry item version.
Read Online or Download Access database design & programming: [what you really need to know to develop with access] PDF
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Extra resources for Access database design & programming: [what you really need to know to develop with access]
In general, making the adjustments necessary to ensure first normal form is not hard, and it is a good general rule that table schemes should be put in first normal form. However, as with the other normal forms (and even more so the higher up we go) each situation must be considered on its own merits. For instance, a single field might be designed to hold a street address, such as 1333 Bessemer Street. Whether the house number and the street name should be separated into distinct attributes is a matter of context.
When data are stored in multiple tables, it is necessary to piece the data back together to provide these various views. 00. This requires gathering data from more than one table. The point is that, by breaking data into separate tables, we must often go to the trouble of piecing the data back together in order to get a comprehensive view of those data. Thus, we can state the following important maxim: As a direct consequence of good database design, we often need to use methods for piecing data from several tables into a single coherent form.
If we knew that the person had no phone number, then the information would no longer be unknown. In this case, the appropriate value of the AuPhone attribute would be the empty string, or perhaps the string "no phone," but not a NULL. Thus, the appropriateness of allowing NULL values for an attribute depends upon the context. The issue of whether NULLs should appear in a key needs some discussion. The purpose of a key is to provide a means for uniquely identifying entities and so it would seem that keys and NULLs are incompatible.