Data Modeling Design

Access database design and programming - download pdf or read online

By Steven Roman

ISBN-10: 0596002734

ISBN-13: 9780596002732

I've been utilizing entry and VBA for many years, with none formal education in relational database or programming. during this concise publication, Steven Roman controlled to provide a powerful starting place within the concept of relational databases, VBA and DAO.

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

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

I however provide the booklet five stars, because the first 3 elements of the ebook are stellar.

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Additional info for Access database design and programming

Sample text

Thus, the domain is the set of all possible values for the attribute. For instance, for the BOOKS table in Table 3-1, the domain D1 is 32 TEAM FLY PRESENTS • the set of all possible ISBNs, and the domain D2 is the set of all possible book titles. No two rows of the table are identical. Let us make some remarks about the concept of a table: • • • A table may (but is not required to) have a name, such as BOOKS, which is intended to convey the meaning of the table as a whole. The number of rows of the table is called the size of the table, and the number of columns is called the degree of the table.

For convenience, we repeat the E/R diagram for the LIBRARY database in Figure 3-1. Figure 3-1. 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).

Also, a table can be indexed on a combination of two or more columns. For instance, if the PUBLISHERS table also included a State column, we could index the table on a combination of City and State, as shown in Figure 3-9. Figure 3-9. Index file between City, State, and Publisher An index on a primary key is referred to as a primary index. Note that Microsoft Access automatically creates an index on a primary key. An index on any other column or columns is called a secondary index. An index based on a key (not necessarily the primary key) is called a unique index , since the indexed column contains unique values.

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Access database design and programming by Steven Roman


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