Access database design & programming: [what you really need by PhD Steven Roman

By PhD Steven Roman

Whereas specific at intermediate Microsoft entry clients who're beginner programmers, this moment variation of the bestselling entry Database layout & Programming may still entice all degrees of entry builders. particularly, the recent variation includes:

    A dialogue of entry' new VBA built-in improvement atmosphere utilized by be aware, Excel, and PowerPoint

    Expanded assurance of the VBA language itself, according to reader requests

    Discussions of Microsoft's most modern info entry know-how, referred to as lively facts items (or ADO), and Open Database Connectivity (ODBC), that's in detail hooked up with ADO

For amateur programmers, this ebook specializes in usually overlooked, yet however crucial, wisdom for constructing potent database purposes. Its therapy of database layout and queries offers intermediate and complicated builders a consolidated resource of information, whereas its programming chapters represent a convenient connection with easy operations that may be played utilizing DAO or the entry item version.

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We can fill in the blank city name because {ZipCode} {City}. 4. A Table with Dependencies City Los Angeles StreetName Hollywood Blvd Vine St ZipCode 95000 95000 The problem here is with the dependency: {ZipCode} {City} which does not violate third normal form because, as we have mentioned, {City} is not strictly informational. The previous example gives us the idea to strengthen the condition in the definition of third normal form, by dropping the requirement that B be strictly informational. Thus, we can define our last, and strongest, normal form.

The user of a database application, such as Access, asks the application to provide a specific view of the data by creating a query. 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.

1 Example A1 A2 a c b d e f A1 A2 g h i j A1 A2 a b c e g d f h i j Note that if S and T do not have the same attributes, but do have the same degree—that is, the same number of columns, then we can first rename the attributes of one table to match the other, and then take their union. Of course, this will not always make sense, since it may result in combining attribute values from different domains into one column. Let us consider an example of how to take a union in Microsoft Access. Unions can be formed in one of two ways in Microsoft Access.

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