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 ebook, Steven Roman controlled to provide a robust starting place within the conception 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 complicated material.

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

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

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Additional info for Access database design and programming

Sample text

Thus, the two titles C++ must both appear somewhere in the database. On the other hand, PubName is redundant, as can easily be seen from the fact that the same PubName is listed twice without adding any new information to the database. To look at this another way, consider the table with two cells blank in Table 4-2. Can you fill in the title field for the last row? Not unless you call the publisher to get the title for that ISBN. In other words, some information is missing. On the other hand, you can fill in the blank PubName field.

Each individual situation (database) must be examined on its own merit. It is impossible to make general rules that apply in all situations. The process of changing a database design to produce table schemes in normal form is called normalization. 3 First Normal Form First normal form is very simple. A table scheme is said to be in first normal formif the attribute values are indivisible. To illustrate, we considered in Chapter 1 the question of 49 TEAM FLY PRESENTS including all the authors of a book in a single attribute, called Authors.

Entity set The set of entities from a given entity class that are currently in the database. 95 Superkey A set of attributes for an entity class that serves to identify an entity uniquely from among all possible entities in that entity class. Example: the set {Title, ISBN} for the Books entity class. Key A minimal superkey; that is, a key with the property that, if we remove an attribute, the resulting set is no longer a superkey. Example: the set {ISBN} for the Books entity class. Table A rectangular array of attribute values whose columns hold the attribute values for a given attribute and whose rows hold the attribute values for a given entity.

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